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Diffstat (limited to 'test/syscalls/linux/inotify.cc')
| -rw-r--r-- | test/syscalls/linux/inotify.cc | 2380 |
1 files changed, 0 insertions, 2380 deletions
diff --git a/test/syscalls/linux/inotify.cc b/test/syscalls/linux/inotify.cc deleted file mode 100644 index 220874aeb..000000000 --- a/test/syscalls/linux/inotify.cc +++ /dev/null @@ -1,2380 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <fcntl.h> -#include <libgen.h> -#include <sched.h> -#include <sys/epoll.h> -#include <sys/inotify.h> -#include <sys/ioctl.h> -#include <sys/time.h> -#include <sys/xattr.h> - -#include <atomic> -#include <list> -#include <string> -#include <vector> - -#include "absl/strings/str_cat.h" -#include "absl/strings/str_format.h" -#include "absl/strings/str_join.h" -#include "absl/synchronization/mutex.h" -#include "absl/time/clock.h" -#include "absl/time/time.h" -#include "test/util/epoll_util.h" -#include "test/util/file_descriptor.h" -#include "test/util/fs_util.h" -#include "test/util/posix_error.h" -#include "test/util/temp_path.h" -#include "test/util/test_util.h" -#include "test/util/thread_util.h" - -namespace gvisor { -namespace testing { -namespace { - -using ::absl::StreamFormat; -using ::absl::StrFormat; - -constexpr int kBufSize = 1024; - -// C++-friendly version of struct inotify_event. -struct Event { - int32_t wd; - uint32_t mask; - uint32_t cookie; - uint32_t len; - std::string name; - - Event(uint32_t mask, int32_t wd, absl::string_view name, uint32_t cookie) - : wd(wd), - mask(mask), - cookie(cookie), - len(name.size()), - name(std::string(name)) {} - Event(uint32_t mask, int32_t wd, absl::string_view name) - : Event(mask, wd, name, 0) {} - Event(uint32_t mask, int32_t wd) : Event(mask, wd, "", 0) {} - Event() : Event(0, 0, "", 0) {} -}; - -// Prints the symbolic name for a struct inotify_event's 'mask' field. -std::string FlagString(uint32_t flags) { - std::vector<std::string> names; - -#define EMIT(target) \ - if (flags & target) { \ - names.push_back(#target); \ - flags &= ~target; \ - } - - EMIT(IN_ACCESS); - EMIT(IN_ATTRIB); - EMIT(IN_CLOSE_WRITE); - EMIT(IN_CLOSE_NOWRITE); - EMIT(IN_CREATE); - EMIT(IN_DELETE); - EMIT(IN_DELETE_SELF); - EMIT(IN_MODIFY); - EMIT(IN_MOVE_SELF); - EMIT(IN_MOVED_FROM); - EMIT(IN_MOVED_TO); - EMIT(IN_OPEN); - - EMIT(IN_DONT_FOLLOW); - EMIT(IN_EXCL_UNLINK); - EMIT(IN_ONESHOT); - EMIT(IN_ONLYDIR); - - EMIT(IN_IGNORED); - EMIT(IN_ISDIR); - EMIT(IN_Q_OVERFLOW); - EMIT(IN_UNMOUNT); - -#undef EMIT - - // If we have anything left over at the end, print it as a hex value. - if (flags) { - names.push_back(absl::StrCat("0x", absl::Hex(flags))); - } - - return absl::StrJoin(names, "|"); -} - -std::string DumpEvent(const Event& event) { - return StrFormat( - "%s, wd=%d%s%s", FlagString(event.mask), event.wd, - (event.len > 0) ? StrFormat(", name=%s", event.name) : "", - (event.cookie > 0) ? StrFormat(", cookie=%ud", event.cookie) : ""); -} - -std::string DumpEvents(const std::vector<Event>& events, int indent_level) { - std::stringstream ss; - ss << StreamFormat("%d event%s:\n", events.size(), - (events.size() > 1) ? "s" : ""); - int i = 0; - for (const Event& ev : events) { - ss << StreamFormat("%sevents[%d]: %s\n", std::string(indent_level, '\t'), - i++, DumpEvent(ev)); - } - return ss.str(); -} - -// A matcher which takes an expected list of events to match against another -// list of inotify events, in order. This is similar to the ElementsAre matcher, -// but displays more informative messages on mismatch. -class EventsAreMatcher - : public ::testing::MatcherInterface<std::vector<Event>> { - public: - explicit EventsAreMatcher(std::vector<Event> references) - : references_(std::move(references)) {} - - bool MatchAndExplain( - std::vector<Event> events, - ::testing::MatchResultListener* const listener) const override { - if (references_.size() != events.size()) { - *listener << StreamFormat("\n\tCount mismatch, got %s", - DumpEvents(events, 2)); - return false; - } - - bool success = true; - for (unsigned int i = 0; i < references_.size(); ++i) { - const Event& reference = references_[i]; - const Event& target = events[i]; - - if (target.mask != reference.mask || target.wd != reference.wd || - target.name != reference.name || target.cookie != reference.cookie) { - *listener << StreamFormat("\n\tMismatch at index %d, want %s, got %s,", - i, DumpEvent(reference), DumpEvent(target)); - success = false; - } - } - - if (!success) { - *listener << StreamFormat("\n\tIn total of %s", DumpEvents(events, 2)); - } - return success; - } - - void DescribeTo(::std::ostream* const os) const override { - *os << StreamFormat("%s", DumpEvents(references_, 1)); - } - - void DescribeNegationTo(::std::ostream* const os) const override { - *os << StreamFormat("mismatch from %s", DumpEvents(references_, 1)); - } - - private: - std::vector<Event> references_; -}; - -::testing::Matcher<std::vector<Event>> Are(std::vector<Event> events) { - return MakeMatcher(new EventsAreMatcher(std::move(events))); -} - -// Similar to the EventsAre matcher, but the order of events are ignored. -class UnorderedEventsAreMatcher - : public ::testing::MatcherInterface<std::vector<Event>> { - public: - explicit UnorderedEventsAreMatcher(std::vector<Event> references) - : references_(std::move(references)) {} - - bool MatchAndExplain( - std::vector<Event> events, - ::testing::MatchResultListener* const listener) const override { - if (references_.size() != events.size()) { - *listener << StreamFormat("\n\tCount mismatch, got %s", - DumpEvents(events, 2)); - return false; - } - - std::vector<Event> unmatched(references_); - - for (const Event& candidate : events) { - for (auto it = unmatched.begin(); it != unmatched.end();) { - const Event& reference = *it; - if (candidate.mask == reference.mask && candidate.wd == reference.wd && - candidate.name == reference.name && - candidate.cookie == reference.cookie) { - it = unmatched.erase(it); - break; - } else { - ++it; - } - } - } - - // Anything left unmatched? If so, the matcher fails. - if (!unmatched.empty()) { - *listener << StreamFormat("\n\tFailed to match %s", - DumpEvents(unmatched, 2)); - *listener << StreamFormat("\n\tIn total of %s", DumpEvents(events, 2)); - return false; - } - - return true; - } - - void DescribeTo(::std::ostream* const os) const override { - *os << StreamFormat("unordered %s", DumpEvents(references_, 1)); - } - - void DescribeNegationTo(::std::ostream* const os) const override { - *os << StreamFormat("mismatch from unordered %s", - DumpEvents(references_, 1)); - } - - private: - std::vector<Event> references_; -}; - -::testing::Matcher<std::vector<Event>> AreUnordered(std::vector<Event> events) { - return MakeMatcher(new UnorderedEventsAreMatcher(std::move(events))); -} - -// Reads events from an inotify fd until either EOF, or read returns EAGAIN. -PosixErrorOr<std::vector<Event>> DrainEvents(int fd) { - std::vector<Event> events; - while (true) { - int events_size = 0; - if (ioctl(fd, FIONREAD, &events_size) < 0) { - return PosixError(errno, "ioctl(FIONREAD) failed on inotify fd"); - } - // Deliberately use a buffer that is larger than necessary, expecting to - // only read events_size bytes. - std::vector<char> buf(events_size + kBufSize, 0); - const ssize_t readlen = read(fd, buf.data(), buf.size()); - MaybeSave(); - // Read error? - if (readlen < 0) { - if (errno == EAGAIN) { - // If EAGAIN, no more events at the moment. Return what we have so far. - return events; - } - // Some other read error. Return an error. Right now if we encounter this - // after already reading some events, they get lost. However, we don't - // expect to see any error, and the calling test will fail immediately if - // we signal an error anyways, so this is acceptable. - return PosixError(errno, "read() failed on inotify fd"); - } - if (readlen < static_cast<int>(sizeof(struct inotify_event))) { - // Impossibly short read. - return PosixError( - EIO, - "read() didn't return enough data represent even a single event"); - } - if (readlen != events_size) { - return PosixError(EINVAL, absl::StrCat("read ", readlen, - " bytes, expected ", events_size)); - } - if (readlen == 0) { - // EOF. - return events; - } - - // Normal read. - const char* cursor = buf.data(); - while (cursor < (buf.data() + readlen)) { - struct inotify_event event = {}; - memcpy(&event, cursor, sizeof(struct inotify_event)); - - Event ev; - ev.wd = event.wd; - ev.mask = event.mask; - ev.cookie = event.cookie; - ev.len = event.len; - if (event.len > 0) { - TEST_CHECK(static_cast<int>(sizeof(struct inotify_event) + event.len) <= - readlen); - ev.name = std::string(cursor + - offsetof(struct inotify_event, name)); // NOLINT - // Name field should always be smaller than event.len, otherwise we have - // a buffer overflow. The two sizes aren't equal because the string - // constructor will stop at the first null byte, while event.name may be - // padded up to event.len using multiple null bytes. - TEST_CHECK(ev.name.size() <= event.len); - } - - events.push_back(ev); - cursor += sizeof(struct inotify_event) + event.len; - } - } -} - -PosixErrorOr<FileDescriptor> InotifyInit1(int flags) { - int fd; - EXPECT_THAT(fd = inotify_init1(flags), SyscallSucceeds()); - if (fd < 0) { - return PosixError(errno, "inotify_init1() failed"); - } - return FileDescriptor(fd); -} - -PosixErrorOr<int> InotifyAddWatch(int fd, const std::string& path, - uint32_t mask) { - int wd; - EXPECT_THAT(wd = inotify_add_watch(fd, path.c_str(), mask), - SyscallSucceeds()); - if (wd < 0) { - return PosixError(errno, "inotify_add_watch() failed"); - } - return wd; -} - -TEST(Inotify, IllegalSeek) { - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(0)); - EXPECT_THAT(lseek(fd.get(), 0, SEEK_SET), SyscallFailsWithErrno(ESPIPE)); -} - -TEST(Inotify, IllegalPread) { - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(0)); - int val; - EXPECT_THAT(pread(fd.get(), &val, sizeof(val), 0), - SyscallFailsWithErrno(ESPIPE)); -} - -TEST(Inotify, IllegalPwrite) { - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(0)); - EXPECT_THAT(pwrite(fd.get(), "x", 1, 0), SyscallFailsWithErrno(ESPIPE)); -} - -TEST(Inotify, IllegalWrite) { - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(0)); - int val = 0; - EXPECT_THAT(write(fd.get(), &val, sizeof(val)), SyscallFailsWithErrno(EBADF)); -} - -TEST(Inotify, InitFlags) { - EXPECT_THAT(inotify_init1(IN_NONBLOCK | IN_CLOEXEC), SyscallSucceeds()); - EXPECT_THAT(inotify_init1(12345), SyscallFailsWithErrno(EINVAL)); -} - -TEST(Inotify, NonBlockingReadReturnsEagain) { - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - std::vector<char> buf(kBufSize, 0); - - // The read below should return fail with EAGAIN because there is no data to - // read and we've specified IN_NONBLOCK. We're guaranteed that there is no - // data to read because we haven't registered any watches yet. - EXPECT_THAT(read(fd.get(), buf.data(), buf.size()), - SyscallFailsWithErrno(EAGAIN)); -} - -TEST(Inotify, AddWatchOnInvalidFdFails) { - // Garbage fd. - EXPECT_THAT(inotify_add_watch(-1, "/tmp", IN_ALL_EVENTS), - SyscallFailsWithErrno(EBADF)); - EXPECT_THAT(inotify_add_watch(1337, "/tmp", IN_ALL_EVENTS), - SyscallFailsWithErrno(EBADF)); - - // Non-inotify fds. - EXPECT_THAT(inotify_add_watch(0, "/tmp", IN_ALL_EVENTS), - SyscallFailsWithErrno(EINVAL)); - EXPECT_THAT(inotify_add_watch(1, "/tmp", IN_ALL_EVENTS), - SyscallFailsWithErrno(EINVAL)); - EXPECT_THAT(inotify_add_watch(2, "/tmp", IN_ALL_EVENTS), - SyscallFailsWithErrno(EINVAL)); - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open("/tmp", O_RDONLY)); - EXPECT_THAT(inotify_add_watch(fd.get(), "/tmp", IN_ALL_EVENTS), - SyscallFailsWithErrno(EINVAL)); -} - -TEST(Inotify, RemovingWatchGeneratesEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - EXPECT_THAT(inotify_rm_watch(fd.get(), wd), SyscallSucceeds()); - - // Read events, ensure the first event is IN_IGNORED. - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_THAT(events, Are({Event(IN_IGNORED, wd)})); -} - -TEST(Inotify, CanDeleteFileAfterRemovingWatch) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - EXPECT_THAT(inotify_rm_watch(fd.get(), wd), SyscallSucceeds()); - file1.reset(); -} - -TEST(Inotify, RemoveWatchAfterDeletingFileFails) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - file1.reset(); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_THAT(events, Are({Event(IN_ATTRIB, wd), Event(IN_DELETE_SELF, wd), - Event(IN_IGNORED, wd)})); - - EXPECT_THAT(inotify_rm_watch(fd.get(), wd), SyscallFailsWithErrno(EINVAL)); -} - -TEST(Inotify, DuplicateWatchRemovalFails) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - EXPECT_THAT(inotify_rm_watch(fd.get(), wd), SyscallSucceeds()); - EXPECT_THAT(inotify_rm_watch(fd.get(), wd), SyscallFailsWithErrno(EINVAL)); -} - -TEST(Inotify, ConcurrentFileDeletionAndWatchRemoval) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const std::string filename = NewTempAbsPathInDir(root.path()); - - auto file_create_delete = [filename]() { - const DisableSave ds; // Too expensive. - for (int i = 0; i < 100; ++i) { - FileDescriptor file_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(filename, O_CREAT, S_IRUSR | S_IWUSR)); - file_fd.reset(); // Close before unlinking (although save is disabled). - EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds()); - } - }; - - const int shared_fd = fd.get(); // We need to pass it to the thread. - auto add_remove_watch = [shared_fd, filename]() { - for (int i = 0; i < 100; ++i) { - int wd = inotify_add_watch(shared_fd, filename.c_str(), IN_ALL_EVENTS); - MaybeSave(); - if (wd != -1) { - // Watch added successfully, try removal. - if (inotify_rm_watch(shared_fd, wd)) { - // If removal fails, the only acceptable reason is if the wd - // is invalid, which will be the case if we try to remove - // the watch after the file has been deleted. - EXPECT_EQ(errno, EINVAL); - } - } else { - // Add watch failed, this should only fail if the target file doesn't - // exist. - EXPECT_EQ(errno, ENOENT); - } - } - }; - - ScopedThread t1(file_create_delete); - ScopedThread t2(add_remove_watch); -} - -TEST(Inotify, DeletingChildGeneratesEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - const std::string file1_path = file1.reset(); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - AreUnordered({Event(IN_ATTRIB, file1_wd), Event(IN_DELETE_SELF, file1_wd), - Event(IN_IGNORED, file1_wd), - Event(IN_DELETE, root_wd, Basename(file1_path))})); -} - -// Creating a file in "parent/child" should generate events for child, but not -// parent. -TEST(Inotify, CreatingFileGeneratesEvents) { - const TempPath parent = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath child = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(parent.path())); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), parent.path(), IN_ALL_EVENTS)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), child.path(), IN_ALL_EVENTS)); - - // Create a new file in the directory. - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(child.path())); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - - // The library function we use to create the new file opens it for writing to - // create it and sets permissions on it, so we expect the three extra events. - ASSERT_THAT(events, Are({Event(IN_CREATE, wd, Basename(file1.path())), - Event(IN_OPEN, wd, Basename(file1.path())), - Event(IN_CLOSE_WRITE, wd, Basename(file1.path())), - Event(IN_ATTRIB, wd, Basename(file1.path()))})); -} - -TEST(Inotify, ReadingFileGeneratesAccessEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - char buf; - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ACCESS, wd, Basename(file1.path()))})); -} - -TEST(Inotify, WritingFileGeneratesModifyEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - const std::string data = "some content"; - EXPECT_THAT(write(file1_fd.get(), data.c_str(), data.length()), - SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_MODIFY, wd, Basename(file1.path()))})); -} - -TEST(Inotify, SizeZeroReadWriteGeneratesNothing) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDWR)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - // Read from the empty file. - int val; - ASSERT_THAT(read(file1_fd.get(), &val, sizeof(val)), - SyscallSucceedsWithValue(0)); - - // Write zero bytes. - ASSERT_THAT(write(file1_fd.get(), "", 0), SyscallSucceedsWithValue(0)); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({})); -} - -TEST(Inotify, FailedFileCreationGeneratesNoEvents) { - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const std::string dir_path = dir.path(); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch(fd.get(), dir_path, IN_ALL_EVENTS)); - - const char* p = dir_path.c_str(); - ASSERT_THAT(mkdir(p, 0777), SyscallFails()); - ASSERT_THAT(mknod(p, S_IFIFO, 0777), SyscallFails()); - ASSERT_THAT(symlink(p, p), SyscallFails()); - ASSERT_THAT(link(p, p), SyscallFails()); - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({})); -} - -TEST(Inotify, WatchSetAfterOpenReportsCloseFdEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - FileDescriptor file1_fd_writable = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - FileDescriptor file1_fd_not_writable = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - file1_fd_writable.reset(); // Close file1_fd_writable. - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_CLOSE_WRITE, wd, Basename(file1.path()))})); - - file1_fd_not_writable.reset(); // Close file1_fd_not_writable. - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, - Are({Event(IN_CLOSE_NOWRITE, wd, Basename(file1.path()))})); -} - -TEST(Inotify, ChildrenDeletionInWatchedDirGeneratesEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - TempPath dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root.path())); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - const std::string file1_path = file1.reset(); - const std::string dir1_path = dir1.release(); - EXPECT_THAT(rmdir(dir1_path.c_str()), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - - ASSERT_THAT(events, - Are({Event(IN_DELETE, wd, Basename(file1_path)), - Event(IN_DELETE | IN_ISDIR, wd, Basename(dir1_path))})); -} - -TEST(Inotify, RmdirOnWatchedTargetGeneratesEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - EXPECT_THAT(rmdir(root.path().c_str()), SyscallSucceeds()); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_DELETE_SELF, wd), Event(IN_IGNORED, wd)})); -} - -TEST(Inotify, MoveGeneratesEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const TempPath dir1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root.path())); - const TempPath dir2 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root.path())); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int dir1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), dir1.path(), IN_ALL_EVENTS)); - const int dir2_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), dir2.path(), IN_ALL_EVENTS)); - // Test move from root -> root. - std::string newpath = NewTempAbsPathInDir(root.path()); - std::string oldpath = file1.release(); - EXPECT_THAT(rename(oldpath.c_str(), newpath.c_str()), SyscallSucceeds()); - file1.reset(newpath); - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - Are({Event(IN_MOVED_FROM, root_wd, Basename(oldpath), events[0].cookie), - Event(IN_MOVED_TO, root_wd, Basename(newpath), events[1].cookie)})); - EXPECT_NE(events[0].cookie, 0); - EXPECT_EQ(events[0].cookie, events[1].cookie); - uint32_t last_cookie = events[0].cookie; - - // Test move from root -> root/dir1. - newpath = NewTempAbsPathInDir(dir1.path()); - oldpath = file1.release(); - EXPECT_THAT(rename(oldpath.c_str(), newpath.c_str()), SyscallSucceeds()); - file1.reset(newpath); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - Are({Event(IN_MOVED_FROM, root_wd, Basename(oldpath), events[0].cookie), - Event(IN_MOVED_TO, dir1_wd, Basename(newpath), events[1].cookie)})); - // Cookies should be distinct between distinct rename events. - EXPECT_NE(events[0].cookie, last_cookie); - EXPECT_EQ(events[0].cookie, events[1].cookie); - last_cookie = events[0].cookie; - - // Test move from root/dir1 -> root/dir2. - newpath = NewTempAbsPathInDir(dir2.path()); - oldpath = file1.release(); - EXPECT_THAT(rename(oldpath.c_str(), newpath.c_str()), SyscallSucceeds()); - file1.reset(newpath); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - Are({Event(IN_MOVED_FROM, dir1_wd, Basename(oldpath), events[0].cookie), - Event(IN_MOVED_TO, dir2_wd, Basename(newpath), events[1].cookie)})); - EXPECT_NE(events[0].cookie, last_cookie); - EXPECT_EQ(events[0].cookie, events[1].cookie); - last_cookie = events[0].cookie; -} - -TEST(Inotify, MoveWatchedTargetGeneratesEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - const std::string newpath = NewTempAbsPathInDir(root.path()); - const std::string oldpath = file1.release(); - EXPECT_THAT(rename(oldpath.c_str(), newpath.c_str()), SyscallSucceeds()); - file1.reset(newpath); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - Are({Event(IN_MOVED_FROM, root_wd, Basename(oldpath), events[0].cookie), - Event(IN_MOVED_TO, root_wd, Basename(newpath), events[1].cookie), - // Self move events do not have a cookie. - Event(IN_MOVE_SELF, file1_wd)})); - EXPECT_NE(events[0].cookie, 0); - EXPECT_EQ(events[0].cookie, events[1].cookie); -} - -TEST(Inotify, CoalesceEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - - FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - // Read the file a few times. This will would generate multiple IN_ACCESS - // events but they should get coalesced to a single event. - char buf; - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - - // Use the close event verify that we haven't simply left the additional - // IN_ACCESS events unread. - file1_fd.reset(); // Close file1_fd. - - const std::string file1_name = std::string(Basename(file1.path())); - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ACCESS, wd, file1_name), - Event(IN_CLOSE_NOWRITE, wd, file1_name)})); - - // Now let's try interleaving other events into a stream of repeated events. - file1_fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDWR)); - - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(write(file1_fd.get(), "x", 1), SyscallSucceeds()); - EXPECT_THAT(write(file1_fd.get(), "x", 1), SyscallSucceeds()); - EXPECT_THAT(write(file1_fd.get(), "x", 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - - file1_fd.reset(); // Close the file. - - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - Are({Event(IN_OPEN, wd, file1_name), Event(IN_ACCESS, wd, file1_name), - Event(IN_MODIFY, wd, file1_name), Event(IN_ACCESS, wd, file1_name), - Event(IN_CLOSE_WRITE, wd, file1_name)})); - - // Ensure events aren't coalesced if they are from different files. - const TempPath file2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - // Discard events resulting from creation of file2. - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - - file1_fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - FileDescriptor file2_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file2.path(), O_RDONLY)); - - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file2_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - - // Close both files. - file1_fd.reset(); - file2_fd.reset(); - - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - const std::string file2_name = std::string(Basename(file2.path())); - ASSERT_THAT( - events, - Are({Event(IN_OPEN, wd, file1_name), Event(IN_OPEN, wd, file2_name), - Event(IN_ACCESS, wd, file1_name), Event(IN_ACCESS, wd, file2_name), - Event(IN_ACCESS, wd, file1_name), - Event(IN_CLOSE_NOWRITE, wd, file1_name), - Event(IN_CLOSE_NOWRITE, wd, file2_name)})); -} - -TEST(Inotify, ClosingInotifyFdWithoutRemovingWatchesWorks) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - // Note: The check on close will happen in FileDescriptor::~FileDescriptor(). -} - -TEST(Inotify, NestedWatches) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - // Read from file1. This should generate an event for both watches. - char buf; - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ACCESS, root_wd, Basename(file1.path())), - Event(IN_ACCESS, file1_wd)})); -} - -TEST(Inotify, ConcurrentThreadsGeneratingEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - std::vector<TempPath> files; - files.reserve(10); - for (int i = 0; i < 10; i++) { - files.emplace_back(ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode))); - } - - auto test_thread = [&files]() { - uint32_t seed = time(nullptr); - for (int i = 0; i < 20; i++) { - const TempPath& file = files[rand_r(&seed) % files.size()]; - const FileDescriptor file_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_WRONLY)); - TEST_PCHECK(write(file_fd.get(), "x", 1) == 1); - } - }; - - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - std::list<ScopedThread> threads; - for (int i = 0; i < 3; i++) { - threads.emplace_back(test_thread); - } - for (auto& t : threads) { - t.Join(); - } - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - // 3 threads doing 20 iterations, 3 events per iteration (open, write, - // close). However, some events may be coalesced, and we can't reliably - // predict how they'll be coalesced since the test threads aren't - // synchronized. We can only check that we aren't getting unexpected events. - for (const Event& ev : events) { - EXPECT_NE(ev.mask & (IN_OPEN | IN_MODIFY | IN_CLOSE_WRITE), 0); - } -} - -TEST(Inotify, ReadWithTooSmallBufferFails) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - // Open the file to queue an event. This event will not have a filename, so - // reading from the inotify fd should return sizeof(struct inotify_event) - // bytes of data. - FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - std::vector<char> buf(kBufSize, 0); - ssize_t readlen; - - // Try a buffer too small to hold any potential event. This is rejected - // outright without the event being dequeued. - EXPECT_THAT(read(fd.get(), buf.data(), sizeof(struct inotify_event) - 1), - SyscallFailsWithErrno(EINVAL)); - // Try a buffer just large enough. This should succeeed. - EXPECT_THAT( - readlen = read(fd.get(), buf.data(), sizeof(struct inotify_event)), - SyscallSucceeds()); - EXPECT_EQ(readlen, sizeof(struct inotify_event)); - // Event queue is now empty, the next read should return EAGAIN. - EXPECT_THAT(read(fd.get(), buf.data(), sizeof(struct inotify_event)), - SyscallFailsWithErrno(EAGAIN)); - - // Now put a watch on the directory, so that generated events contain a name. - EXPECT_THAT(inotify_rm_watch(fd.get(), wd), SyscallSucceeds()); - - // Drain the event generated from the watch removal. - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - file1_fd.reset(); // Close file to generate an event. - - // Try a buffer too small to hold any event and one too small to hold an event - // with a name. These should both fail without consuming the event. - EXPECT_THAT(read(fd.get(), buf.data(), sizeof(struct inotify_event) - 1), - SyscallFailsWithErrno(EINVAL)); - EXPECT_THAT(read(fd.get(), buf.data(), sizeof(struct inotify_event)), - SyscallFailsWithErrno(EINVAL)); - // Now try with a large enough buffer. This should return the one event. - EXPECT_THAT(readlen = read(fd.get(), buf.data(), buf.size()), - SyscallSucceeds()); - EXPECT_GE(readlen, - sizeof(struct inotify_event) + Basename(file1.path()).size()); - // With the single event read, the queue should once again be empty. - EXPECT_THAT(read(fd.get(), buf.data(), sizeof(struct inotify_event)), - SyscallFailsWithErrno(EAGAIN)); -} - -TEST(Inotify, BlockingReadOnInotifyFd) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(0)); - const TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - // Spawn a thread performing a blocking read for new events on the inotify fd. - std::vector<char> buf(kBufSize, 0); - const int shared_fd = fd.get(); // The thread needs it. - ScopedThread t([shared_fd, &buf]() { - ssize_t readlen; - EXPECT_THAT(readlen = read(shared_fd, buf.data(), buf.size()), - SyscallSucceeds()); - }); - - // Perform a read on the watched file, which should generate an IN_ACCESS - // event, unblocking the event_reader thread. - char c; - EXPECT_THAT(read(file1_fd.get(), &c, 1), SyscallSucceeds()); - - // Wait for the thread to read the event and exit. - t.Join(); - - // Make sure the event we got back is sane. - uint32_t event_mask; - memcpy(&event_mask, buf.data() + offsetof(struct inotify_event, mask), - sizeof(event_mask)); - EXPECT_EQ(event_mask, IN_ACCESS); -} - -TEST(Inotify, WatchOnRelativePath) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - - // Change working directory to root. - const FileDescriptor cwd = ASSERT_NO_ERRNO_AND_VALUE(Open(".", O_PATH)); - EXPECT_THAT(chdir(root.path().c_str()), SyscallSucceeds()); - - // Add a watch on file1 with a relative path. - const int wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - fd.get(), std::string(Basename(file1.path())), IN_ALL_EVENTS)); - - // Perform a read on file1, this should generate an IN_ACCESS event. - char c; - EXPECT_THAT(read(file1_fd.get(), &c, 1), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_THAT(events, Are({Event(IN_ACCESS, wd)})); - - // Explicitly reset the working directory so that we don't continue to - // reference "root". Once the test ends, "root" will get unlinked. If we - // continue to hold a reference, random save/restore tests can fail if a save - // is triggered after "root" is unlinked; we can't save deleted fs objects - // with active references. - EXPECT_THAT(fchdir(cwd.get()), SyscallSucceeds()); -} - -TEST(Inotify, ZeroLengthReadWriteDoesNotGenerateEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const char kContent[] = "some content"; - TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), kContent, TempPath::kDefaultFileMode)); - const int kContentSize = sizeof(kContent) - 1; - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDWR)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - std::vector<char> buf(kContentSize, 0); - // Read all available data. - ssize_t readlen; - EXPECT_THAT(readlen = read(file1_fd.get(), buf.data(), kContentSize), - SyscallSucceeds()); - EXPECT_EQ(readlen, kContentSize); - // Drain all events and make sure we got the IN_ACCESS for the read. - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_THAT(events, Are({Event(IN_ACCESS, wd, Basename(file1.path()))})); - - // Now try read again. This should be a 0-length read, since we're at EOF. - char c; - EXPECT_THAT(readlen = read(file1_fd.get(), &c, 1), SyscallSucceeds()); - EXPECT_EQ(readlen, 0); - // We should have no new events. - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_TRUE(events.empty()); - - // Try issuing a zero-length read. - EXPECT_THAT(readlen = read(file1_fd.get(), &c, 0), SyscallSucceeds()); - EXPECT_EQ(readlen, 0); - // We should have no new events. - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_TRUE(events.empty()); - - // Try issuing a zero-length write. - ssize_t writelen; - EXPECT_THAT(writelen = write(file1_fd.get(), &c, 0), SyscallSucceeds()); - EXPECT_EQ(writelen, 0); - // We should have no new events. - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_TRUE(events.empty()); -} - -TEST(Inotify, ChmodGeneratesAttribEvent_NoRandomSave) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - FileDescriptor root_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(root.path(), O_RDONLY)); - FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDWR)); - FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - auto verify_chmod_events = [&]() { - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ATTRIB, root_wd, Basename(file1.path())), - Event(IN_ATTRIB, file1_wd)})); - }; - - // Don't do cooperative S/R tests for any of the {f}chmod* syscalls below, the - // test will always fail because nodes cannot be saved when they have stricter - // permissions than the original host node. - const DisableSave ds; - - // Chmod. - ASSERT_THAT(chmod(file1.path().c_str(), S_IWGRP), SyscallSucceeds()); - verify_chmod_events(); - - // Fchmod. - ASSERT_THAT(fchmod(file1_fd.get(), S_IRGRP | S_IWGRP), SyscallSucceeds()); - verify_chmod_events(); - - // Fchmodat. - const std::string file1_basename = std::string(Basename(file1.path())); - ASSERT_THAT(fchmodat(root_fd.get(), file1_basename.c_str(), S_IWGRP, 0), - SyscallSucceeds()); - verify_chmod_events(); - - // Make sure the chmod'ed file descriptors are destroyed before DisableSave - // is destructed. - root_fd.reset(); - file1_fd.reset(); -} - -TEST(Inotify, TruncateGeneratesModifyEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDWR)); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - auto verify_truncate_events = [&]() { - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_MODIFY, root_wd, Basename(file1.path())), - Event(IN_MODIFY, file1_wd)})); - }; - - // Truncate. - EXPECT_THAT(truncate(file1.path().c_str(), 4096), SyscallSucceeds()); - verify_truncate_events(); - - // Ftruncate. - EXPECT_THAT(ftruncate(file1_fd.get(), 8192), SyscallSucceeds()); - verify_truncate_events(); - - // No events if truncate fails. - EXPECT_THAT(ftruncate(file1_fd.get(), -1), SyscallFailsWithErrno(EINVAL)); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({})); -} - -TEST(Inotify, GetdentsGeneratesAccessEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - // This internally calls getdents(2). We also expect to see an open/close - // event for the dirfd. - ASSERT_NO_ERRNO_AND_VALUE(ListDir(root.path(), false)); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - - // Linux only seems to generate access events on getdents() on some - // calls. Allow the test to pass even if it isn't generated. gVisor will - // always generate the IN_ACCESS event so the test will at least ensure gVisor - // behaves reasonably. - int i = 0; - EXPECT_EQ(events[i].mask, IN_OPEN | IN_ISDIR); - ++i; - if (IsRunningOnGvisor()) { - EXPECT_EQ(events[i].mask, IN_ACCESS | IN_ISDIR); - ++i; - } else { - if (events[i].mask == (IN_ACCESS | IN_ISDIR)) { - // Skip over the IN_ACCESS event on Linux, it only shows up some of the - // time so we can't assert its existence. - ++i; - } - } - EXPECT_EQ(events[i].mask, IN_CLOSE_NOWRITE | IN_ISDIR); -} - -TEST(Inotify, MknodGeneratesCreateEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - const TempPath file1(root.path() + "/file1"); - const int rc = mknod(file1.path().c_str(), S_IFREG, 0); - // mknod(2) is only supported on tmpfs in the sandbox. - SKIP_IF(IsRunningOnGvisor() && rc != 0); - ASSERT_THAT(rc, SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_CREATE, wd, Basename(file1.path()))})); -} - -TEST(Inotify, SymlinkGeneratesCreateEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const TempPath link1(NewTempAbsPathInDir(root.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - ASSERT_THAT(symlink(file1.path().c_str(), link1.path().c_str()), - SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - - ASSERT_THAT(events, Are({Event(IN_CREATE, root_wd, Basename(link1.path()))})); -} - -TEST(Inotify, LinkGeneratesAttribAndCreateEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const TempPath link1(root.path() + "/link1"); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - const int rc = link(file1.path().c_str(), link1.path().c_str()); - // NOTE(b/34861058): link(2) is only supported on tmpfs in the sandbox. - SKIP_IF(IsRunningOnGvisor() && rc != 0 && - (errno == EPERM || errno == ENOENT)); - ASSERT_THAT(rc, SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ATTRIB, file1_wd), - Event(IN_CREATE, root_wd, Basename(link1.path()))})); -} - -TEST(Inotify, UtimesGeneratesAttribEvent) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDWR)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - - const struct timeval times[2] = {{1, 0}, {2, 0}}; - EXPECT_THAT(futimes(file1_fd.get(), times), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ATTRIB, wd, Basename(file1.path()))})); -} - -TEST(Inotify, HardlinksReuseSameWatch) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - TempPath link1(root.path() + "/link1"); - const int rc = link(file1.path().c_str(), link1.path().c_str()); - // link(2) is only supported on tmpfs in the sandbox. - SKIP_IF(IsRunningOnGvisor() && rc != 0 && - (errno == EPERM || errno == ENOENT)); - ASSERT_THAT(rc, SyscallSucceeds()); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int root_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int file1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - const int link1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), link1.path(), IN_ALL_EVENTS)); - - // The watch descriptors for watches on different links to the same file - // should be identical. - EXPECT_NE(root_wd, file1_wd); - EXPECT_EQ(file1_wd, link1_wd); - - FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, - AreUnordered({Event(IN_OPEN, root_wd, Basename(file1.path())), - Event(IN_OPEN, file1_wd)})); - - // For the next step, we want to ensure all fds to the file are closed. Do - // that now and drain the resulting events. - file1_fd.reset(); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, - Are({Event(IN_CLOSE_WRITE, root_wd, Basename(file1.path())), - Event(IN_CLOSE_WRITE, file1_wd)})); - - // Try removing the link and let's see what events show up. Note that after - // this, we still have a link to the file so the watch shouldn't be - // automatically removed. - const std::string link1_path = link1.reset(); - - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_ATTRIB, link1_wd), - Event(IN_DELETE, root_wd, Basename(link1_path))})); - - // Now remove the other link. Since this is the last link to the file, the - // watch should be automatically removed. - const std::string file1_path = file1.reset(); - - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - AreUnordered({Event(IN_ATTRIB, file1_wd), Event(IN_DELETE_SELF, file1_wd), - Event(IN_IGNORED, file1_wd), - Event(IN_DELETE, root_wd, Basename(file1_path))})); -} - -// Calling mkdir within "parent/child" should generate an event for child, but -// not parent. -TEST(Inotify, MkdirGeneratesCreateEventWithDirFlag) { - const TempPath parent = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath child = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(parent.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), parent.path(), IN_ALL_EVENTS)); - const int child_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), child.path(), IN_ALL_EVENTS)); - - const TempPath dir1(NewTempAbsPathInDir(child.path())); - ASSERT_THAT(mkdir(dir1.path().c_str(), 0777), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT( - events, - Are({Event(IN_CREATE | IN_ISDIR, child_wd, Basename(dir1.path()))})); -} - -TEST(Inotify, MultipleInotifyInstancesAndWatchesAllGetEvents) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - constexpr int kNumFds = 30; - std::vector<FileDescriptor> inotify_fds; - - for (int i = 0; i < kNumFds; ++i) { - const DisableSave ds; // Too expensive. - inotify_fds.emplace_back( - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK))); - const FileDescriptor& fd = inotify_fds[inotify_fds.size() - 1]; // Back. - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - } - - const std::string data = "some content"; - EXPECT_THAT(write(file1_fd.get(), data.c_str(), data.length()), - SyscallSucceeds()); - - for (const FileDescriptor& fd : inotify_fds) { - const DisableSave ds; // Too expensive. - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - if (events.size() >= 2) { - EXPECT_EQ(events[0].mask, IN_MODIFY); - EXPECT_EQ(events[0].wd, 1); - EXPECT_EQ(events[0].name, Basename(file1.path())); - EXPECT_EQ(events[1].mask, IN_MODIFY); - EXPECT_EQ(events[1].wd, 2); - EXPECT_EQ(events[1].name, ""); - } - } -} - -TEST(Inotify, EventsGoUpAtMostOneLevel) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath dir1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root.path())); - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), root.path(), IN_ALL_EVENTS)); - const int dir1_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), dir1.path(), IN_ALL_EVENTS)); - - const std::string file1_path = file1.reset(); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_DELETE, dir1_wd, Basename(file1_path))})); -} - -TEST(Inotify, DuplicateWatchReturnsSameWatchDescriptor) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd1 = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - const int wd2 = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - EXPECT_EQ(wd1, wd2); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - // The watch shouldn't be duplicated, we only expect one event. - ASSERT_THAT(events, Are({Event(IN_OPEN, wd1)})); -} - -TEST(Inotify, UnmatchedEventsAreDiscarded) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ACCESS)); - - FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - // We only asked for access events, the open event should be discarded. - ASSERT_THAT(events, Are({})); - - // IN_IGNORED events are always generated, regardless of the mask. - file1_fd.reset(); - file1.reset(); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_IGNORED, wd)})); -} - -TEST(Inotify, AddWatchWithInvalidEventMaskFails) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - EXPECT_THAT(inotify_add_watch(fd.get(), root.path().c_str(), 0), - SyscallFailsWithErrno(EINVAL)); -} - -TEST(Inotify, AddWatchOnInvalidPathFails) { - const TempPath nonexistent(NewTempAbsPath()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - // Non-existent path. - EXPECT_THAT( - inotify_add_watch(fd.get(), nonexistent.path().c_str(), IN_CREATE), - SyscallFailsWithErrno(ENOENT)); - - // Garbage path pointer. - EXPECT_THAT(inotify_add_watch(fd.get(), nullptr, IN_CREATE), - SyscallFailsWithErrno(EFAULT)); -} - -TEST(Inotify, InOnlyDirFlagRespected) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - EXPECT_THAT( - inotify_add_watch(fd.get(), root.path().c_str(), IN_ACCESS | IN_ONLYDIR), - SyscallSucceeds()); - - EXPECT_THAT( - inotify_add_watch(fd.get(), file1.path().c_str(), IN_ACCESS | IN_ONLYDIR), - SyscallFailsWithErrno(ENOTDIR)); -} - -TEST(Inotify, MaskAddMergesWithExistingEventMask) { - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file1 = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(root.path())); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_WRONLY)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_OPEN | IN_CLOSE_WRITE)); - - const std::string data = "some content"; - EXPECT_THAT(write(file1_fd.get(), data.c_str(), data.length()), - SyscallSucceeds()); - - // We shouldn't get any events, since IN_MODIFY wasn't in the event mask. - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({})); - - // Add IN_MODIFY to event mask. - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_MODIFY | IN_MASK_ADD)); - - EXPECT_THAT(write(file1_fd.get(), data.c_str(), data.length()), - SyscallSucceeds()); - - // This time we should get the modify event. - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_MODIFY, wd)})); - - // Now close the fd. If the modify event was added to the event mask rather - // than replacing the event mask we won't get the close event. - file1_fd.reset(); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events, Are({Event(IN_CLOSE_WRITE, wd)})); -} - -// Test that control events bits are not considered when checking event mask. -TEST(Inotify, ControlEvents) { - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), dir.path(), IN_ACCESS)); - - // Check that events in the mask are dispatched and that control bits are - // part of the event mask. - std::vector<std::string> files = - ASSERT_NO_ERRNO_AND_VALUE(ListDir(dir.path(), false)); - ASSERT_EQ(files.size(), 2); - - const std::vector<Event> events1 = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events1, Are({Event(IN_ACCESS | IN_ISDIR, wd)})); - - // Check that events not in the mask are discarded. - const FileDescriptor dir_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(dir.path(), O_RDONLY | O_DIRECTORY)); - - const std::vector<Event> events2 = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - ASSERT_THAT(events2, Are({})); -} - -// Regression test to ensure epoll and directory access doesn't deadlock. -TEST(Inotify, EpollNoDeadlock) { - const DisableSave ds; // Too many syscalls. - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - // Create lots of directories and watch all of them. - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - std::vector<TempPath> children; - for (size_t i = 0; i < 1000; ++i) { - auto child = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(root.path())); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), child.path(), IN_ACCESS)); - children.emplace_back(std::move(child)); - } - - // Run epoll_wait constantly in a separate thread. - std::atomic<bool> done(false); - ScopedThread th([&fd, &done] { - for (auto start = absl::Now(); absl::Now() - start < absl::Seconds(5);) { - FileDescriptor epoll_fd = ASSERT_NO_ERRNO_AND_VALUE(NewEpollFD()); - ASSERT_NO_ERRNO(RegisterEpollFD(epoll_fd.get(), fd.get(), - EPOLLIN | EPOLLOUT | EPOLLET, 0)); - struct epoll_event result[1]; - EXPECT_THAT(RetryEINTR(epoll_wait)(epoll_fd.get(), result, 1, -1), - SyscallSucceedsWithValue(1)); - - sched_yield(); - } - done = true; - }); - - // While epoll thread is running, constantly access all directories to - // generate inotify events. - while (!done) { - std::vector<std::string> files = - ASSERT_NO_ERRNO_AND_VALUE(ListDir(root.path(), false)); - ASSERT_EQ(files.size(), 1002); - for (const auto& child : files) { - if (child == "." || child == "..") { - continue; - } - ASSERT_NO_ERRNO_AND_VALUE(ListDir(JoinPath(root.path(), child), false)); - } - sched_yield(); - } -} - -// On Linux, inotify behavior is not very consistent with splice(2). We try our -// best to emulate Linux for very basic calls to splice. -TEST(Inotify, SpliceOnWatchTarget) { - int pipes[2]; - ASSERT_THAT(pipe2(pipes, O_NONBLOCK), SyscallSucceeds()); - - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - dir.path(), "some content", TempPath::kDefaultFileMode)); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR)); - const int dir_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), dir.path(), IN_ALL_EVENTS)); - const int file_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), file.path(), IN_ALL_EVENTS)); - - EXPECT_THAT(splice(fd.get(), nullptr, pipes[1], nullptr, 1, /*flags=*/0), - SyscallSucceedsWithValue(1)); - - // Surprisingly, events are not generated in Linux if we read from a file. - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - ASSERT_THAT(events, Are({})); - - EXPECT_THAT(splice(pipes[0], nullptr, fd.get(), nullptr, 1, /*flags=*/0), - SyscallSucceedsWithValue(1)); - - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - ASSERT_THAT(events, Are({ - Event(IN_MODIFY, dir_wd, Basename(file.path())), - Event(IN_MODIFY, file_wd), - })); -} - -TEST(Inotify, SpliceOnInotifyFD) { - int pipes[2]; - ASSERT_THAT(pipe2(pipes, O_NONBLOCK), SyscallSucceeds()); - - const TempPath root = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const TempPath file1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileWith( - root.path(), "some content", TempPath::kDefaultFileMode)); - - const FileDescriptor file1_fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file1.path(), O_RDONLY)); - const int watcher = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), file1.path(), IN_ALL_EVENTS)); - - char buf; - EXPECT_THAT(read(file1_fd.get(), &buf, 1), SyscallSucceeds()); - - EXPECT_THAT(splice(fd.get(), nullptr, pipes[1], nullptr, - sizeof(struct inotify_event) + 1, SPLICE_F_NONBLOCK), - SyscallSucceedsWithValue(sizeof(struct inotify_event))); - - const FileDescriptor read_fd(pipes[0]); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(read_fd.get())); - ASSERT_THAT(events, Are({Event(IN_ACCESS, watcher)})); -} - -// Watches on a parent should not be triggered by actions on a hard link to one -// of its children that has a different parent. -TEST(Inotify, LinkOnOtherParent) { - const TempPath dir1 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath dir2 = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir1.path())); - std::string link_path = NewTempAbsPathInDir(dir2.path()); - - const int rc = link(file.path().c_str(), link_path.c_str()); - // NOTE(b/34861058): link(2) is only supported on tmpfs in the sandbox. - SKIP_IF(IsRunningOnGvisor() && rc != 0 && - (errno == EPERM || errno == ENOENT)); - ASSERT_THAT(rc, SyscallSucceeds()); - - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), dir1.path(), IN_ALL_EVENTS)); - - // Perform various actions on the link outside of dir1, which should trigger - // no inotify events. - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(link_path.c_str(), O_RDWR)); - int val = 0; - ASSERT_THAT(write(fd.get(), &val, sizeof(val)), SyscallSucceeds()); - ASSERT_THAT(read(fd.get(), &val, sizeof(val)), SyscallSucceeds()); - ASSERT_THAT(ftruncate(fd.get(), 12345), SyscallSucceeds()); - ASSERT_THAT(unlink(link_path.c_str()), SyscallSucceeds()); - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({})); -} - -TEST(Inotify, Xattr) { - // TODO(gvisor.dev/issue/1636): Support extended attributes in runsc gofer. - SKIP_IF(IsRunningOnGvisor()); - - const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - const std::string path = file.path(); - const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(path, O_RDWR)); - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), path, IN_ALL_EVENTS)); - - const char* cpath = path.c_str(); - const char* name = "user.test"; - int val = 123; - ASSERT_THAT(setxattr(cpath, name, &val, sizeof(val), /*flags=*/0), - SyscallSucceeds()); - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({Event(IN_ATTRIB, wd)})); - - ASSERT_THAT(getxattr(cpath, name, &val, sizeof(val)), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({})); - - char list[100]; - ASSERT_THAT(listxattr(cpath, list, sizeof(list)), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({})); - - ASSERT_THAT(removexattr(cpath, name), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({Event(IN_ATTRIB, wd)})); - - ASSERT_THAT(fsetxattr(fd.get(), name, &val, sizeof(val), /*flags=*/0), - SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({Event(IN_ATTRIB, wd)})); - - ASSERT_THAT(fgetxattr(fd.get(), name, &val, sizeof(val)), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({})); - - ASSERT_THAT(flistxattr(fd.get(), list, sizeof(list)), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({})); - - ASSERT_THAT(fremovexattr(fd.get(), name), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({Event(IN_ATTRIB, wd)})); -} - -TEST(Inotify, Exec) { - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath bin = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateSymlinkTo(dir.path(), "/bin/true")); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(fd.get(), bin.path(), IN_ALL_EVENTS)); - - // Perform exec. - ScopedThread t([&bin]() { - ASSERT_THAT(execl(bin.path().c_str(), bin.path().c_str(), (char*)nullptr), - SyscallSucceeds()); - }); - t.Join(); - - std::vector<Event> events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(fd.get())); - EXPECT_THAT(events, Are({Event(IN_OPEN, wd), Event(IN_ACCESS, wd)})); -} - -// Watches without IN_EXCL_UNLINK, should continue to emit events for file -// descriptors after their corresponding files have been unlinked. -// -// We need to disable S/R because there are filesystems where we cannot re-open -// fds to an unlinked file across S/R, e.g. gofer-backed filesytems. -TEST(Inotify, IncludeUnlinkedFile_NoRandomSave) { - const DisableSave ds; - - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file = ASSERT_NO_ERRNO_AND_VALUE( - TempPath::CreateFileWith(dir.path(), "123", TempPath::kDefaultFileMode)); - FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR)); - - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int dir_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), dir.path(), IN_ALL_EVENTS)); - const int file_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), file.path(), IN_ALL_EVENTS)); - - ASSERT_THAT(unlink(file.path().c_str()), SyscallSucceeds()); - int val = 0; - ASSERT_THAT(read(fd.get(), &val, sizeof(val)), SyscallSucceeds()); - ASSERT_THAT(write(fd.get(), &val, sizeof(val)), SyscallSucceeds()); - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_ATTRIB, file_wd), - Event(IN_DELETE, dir_wd, Basename(file.path())), - Event(IN_ACCESS, dir_wd, Basename(file.path())), - Event(IN_ACCESS, file_wd), - Event(IN_MODIFY, dir_wd, Basename(file.path())), - Event(IN_MODIFY, file_wd), - })); - - fd.reset(); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_CLOSE_WRITE, dir_wd, Basename(file.path())), - Event(IN_CLOSE_WRITE, file_wd), - Event(IN_DELETE_SELF, file_wd), - Event(IN_IGNORED, file_wd), - })); -} - -// Watches created with IN_EXCL_UNLINK will stop emitting events on fds for -// children that have already been unlinked. -// -// We need to disable S/R because there are filesystems where we cannot re-open -// fds to an unlinked file across S/R, e.g. gofer-backed filesytems. -TEST(Inotify, ExcludeUnlink_NoRandomSave) { - const DisableSave ds; - // TODO(gvisor.dev/issue/1624): This test fails on VFS1. - SKIP_IF(IsRunningWithVFS1()); - - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir.path())); - - FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDWR)); - - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int dir_wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), dir.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - const int file_wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), file.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - - // Unlink the child, which should cause further operations on the open file - // descriptor to be ignored. - ASSERT_THAT(unlink(file.path().c_str()), SyscallSucceeds()); - int val = 0; - ASSERT_THAT(write(fd.get(), &val, sizeof(val)), SyscallSucceeds()); - ASSERT_THAT(read(fd.get(), &val, sizeof(val)), SyscallSucceeds()); - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_ATTRIB, file_wd), - Event(IN_DELETE, dir_wd, Basename(file.path())), - })); - - fd.reset(); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - ASSERT_THAT(events, Are({ - Event(IN_DELETE_SELF, file_wd), - Event(IN_IGNORED, file_wd), - })); -} - -// We need to disable S/R because there are filesystems where we cannot re-open -// fds to an unlinked file across S/R, e.g. gofer-backed filesytems. -TEST(Inotify, ExcludeUnlinkDirectory_NoRandomSave) { - // TODO(gvisor.dev/issue/1624): This test fails on VFS1. Remove once VFS1 is - // deleted. - SKIP_IF(IsRunningWithVFS1()); - - const DisableSave ds; - - const TempPath parent = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - TempPath dir = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDirIn(parent.path())); - std::string dirPath = dir.path(); - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(dirPath.c_str(), O_RDONLY | O_DIRECTORY)); - const int parent_wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), parent.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - const int self_wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), dir.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - - // Unlink the dir, and then close the open fd. - ASSERT_THAT(rmdir(dirPath.c_str()), SyscallSucceeds()); - dir.reset(); - - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - // No close event should appear. - ASSERT_THAT(events, - Are({Event(IN_DELETE | IN_ISDIR, parent_wd, Basename(dirPath))})); - - fd.reset(); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - ASSERT_THAT(events, Are({ - Event(IN_DELETE_SELF, self_wd), - Event(IN_IGNORED, self_wd), - })); -} - -// If "dir/child" and "dir/child2" are links to the same file, and "dir/child" -// is unlinked, a watch on "dir" with IN_EXCL_UNLINK will exclude future events -// for fds on "dir/child" but not "dir/child2". -// -// We need to disable S/R because there are filesystems where we cannot re-open -// fds to an unlinked file across S/R, e.g. gofer-backed filesytems. -TEST(Inotify, ExcludeUnlinkMultipleChildren_NoRandomSave) { - const DisableSave ds; - // TODO(gvisor.dev/issue/1624): This test fails on VFS1. - SKIP_IF(IsRunningWithVFS1()); - - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir.path())); - std::string path1 = file.path(); - std::string path2 = NewTempAbsPathInDir(dir.path()); - - const int rc = link(path1.c_str(), path2.c_str()); - // NOTE(b/34861058): link(2) is only supported on tmpfs in the sandbox. - SKIP_IF(IsRunningOnGvisor() && rc != 0 && - (errno == EPERM || errno == ENOENT)); - ASSERT_THAT(rc, SyscallSucceeds()); - const FileDescriptor fd1 = - ASSERT_NO_ERRNO_AND_VALUE(Open(path1.c_str(), O_RDWR)); - const FileDescriptor fd2 = - ASSERT_NO_ERRNO_AND_VALUE(Open(path2.c_str(), O_RDWR)); - - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), dir.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - - // After unlinking path1, only events on the fd for path2 should be generated. - ASSERT_THAT(unlink(path1.c_str()), SyscallSucceeds()); - ASSERT_THAT(write(fd1.get(), "x", 1), SyscallSucceeds()); - ASSERT_THAT(write(fd2.get(), "x", 1), SyscallSucceeds()); - - const std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_DELETE, wd, Basename(path1)), - Event(IN_MODIFY, wd, Basename(path2)), - })); -} - -// On native Linux, actions of data type FSNOTIFY_EVENT_INODE are not affected -// by IN_EXCL_UNLINK (see -// fs/notify/inotify/inotify_fsnotify.c:inotify_handle_event). Inode-level -// events include changes to metadata and extended attributes. -// -// We need to disable S/R because there are filesystems where we cannot re-open -// fds to an unlinked file across S/R, e.g. gofer-backed filesytems. -TEST(Inotify, ExcludeUnlinkInodeEvents_NoRandomSave) { - const DisableSave ds; - - const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const TempPath file = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir.path())); - - const FileDescriptor fd = - ASSERT_NO_ERRNO_AND_VALUE(Open(file.path().c_str(), O_RDWR)); - - // NOTE(b/157163751): Create another link before unlinking. This is needed for - // the gofer filesystem in gVisor, where open fds will not work once the link - // count hits zero. In VFS2, we end up skipping the gofer test anyway, because - // hard links are not supported for gofer fs. - if (IsRunningOnGvisor()) { - std::string link_path = NewTempAbsPath(); - const int rc = link(file.path().c_str(), link_path.c_str()); - // NOTE(b/34861058): link(2) is only supported on tmpfs in the sandbox. - SKIP_IF(rc != 0 && (errno == EPERM || errno == ENOENT)); - ASSERT_THAT(rc, SyscallSucceeds()); - } - - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - const int dir_wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), dir.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - const int file_wd = ASSERT_NO_ERRNO_AND_VALUE(InotifyAddWatch( - inotify_fd.get(), file.path(), IN_ALL_EVENTS | IN_EXCL_UNLINK)); - - // Even after unlinking, inode-level operations will trigger events regardless - // of IN_EXCL_UNLINK. - ASSERT_THAT(unlink(file.path().c_str()), SyscallSucceeds()); - - // Perform various actions on fd. - ASSERT_THAT(ftruncate(fd.get(), 12345), SyscallSucceeds()); - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_ATTRIB, file_wd), - Event(IN_DELETE, dir_wd, Basename(file.path())), - Event(IN_MODIFY, dir_wd, Basename(file.path())), - Event(IN_MODIFY, file_wd), - })); - - const struct timeval times[2] = {{1, 0}, {2, 0}}; - ASSERT_THAT(futimes(fd.get(), times), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_ATTRIB, dir_wd, Basename(file.path())), - Event(IN_ATTRIB, file_wd), - })); - - // S/R is disabled on this entire test due to behavior with unlink; it must - // also be disabled after this point because of fchmod. - ASSERT_THAT(fchmod(fd.get(), 0777), SyscallSucceeds()); - events = ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_ATTRIB, dir_wd, Basename(file.path())), - Event(IN_ATTRIB, file_wd), - })); -} - -TEST(Inotify, OneShot) { - // TODO(gvisor.dev/issue/1624): IN_ONESHOT not supported in VFS1. - SKIP_IF(IsRunningWithVFS1()); - - const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); - const FileDescriptor inotify_fd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - - const int wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(inotify_fd.get(), file.path(), IN_MODIFY | IN_ONESHOT)); - - // Open an fd, write to it, and then close it. - FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_WRONLY)); - ASSERT_THAT(write(fd.get(), "x", 1), SyscallSucceedsWithValue(1)); - fd.reset(); - - // We should get a single event followed by IN_IGNORED indicating removal - // of the one-shot watch. Prior activity (i.e. open) that is not in the mask - // should not trigger removal, and activity after removal (i.e. close) should - // not generate events. - std::vector<Event> events = - ASSERT_NO_ERRNO_AND_VALUE(DrainEvents(inotify_fd.get())); - EXPECT_THAT(events, Are({ - Event(IN_MODIFY, wd), - Event(IN_IGNORED, wd), - })); - - // The watch should already have been removed. - EXPECT_THAT(inotify_rm_watch(inotify_fd.get(), wd), - SyscallFailsWithErrno(EINVAL)); -} - -// This test helps verify that the lock order of filesystem and inotify locks -// is respected when inotify instances and watch targets are concurrently being -// destroyed. -TEST(InotifyTest, InotifyAndTargetDestructionDoNotDeadlock_NoRandomSave) { - const DisableSave ds; // Too many syscalls. - - // A file descriptor protected by a mutex. This ensures that while a - // descriptor is in use, it cannot be closed and reused for a different file - // description. - struct atomic_fd { - int fd; - absl::Mutex mu; - }; - - // Set up initial inotify instances. - constexpr int num_fds = 3; - std::vector<atomic_fd> fds(num_fds); - for (int i = 0; i < num_fds; i++) { - int fd; - ASSERT_THAT(fd = inotify_init1(IN_NONBLOCK), SyscallSucceeds()); - fds[i].fd = fd; - } - - // Set up initial watch targets. - std::vector<std::string> paths; - for (int i = 0; i < 3; i++) { - paths.push_back(NewTempAbsPath()); - ASSERT_THAT(mknod(paths[i].c_str(), S_IFREG | 0600, 0), SyscallSucceeds()); - } - - constexpr absl::Duration runtime = absl::Seconds(4); - - // Constantly replace each inotify instance with a new one. - auto replace_fds = [&] { - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - for (auto& afd : fds) { - int new_fd; - ASSERT_THAT(new_fd = inotify_init1(IN_NONBLOCK), SyscallSucceeds()); - absl::MutexLock l(&afd.mu); - ASSERT_THAT(close(afd.fd), SyscallSucceeds()); - afd.fd = new_fd; - for (auto& p : paths) { - // inotify_add_watch may fail if the file at p was deleted. - ASSERT_THAT(inotify_add_watch(afd.fd, p.c_str(), IN_ALL_EVENTS), - AnyOf(SyscallSucceeds(), SyscallFailsWithErrno(ENOENT))); - } - } - sched_yield(); - } - }; - - std::list<ScopedThread> ts; - for (int i = 0; i < 3; i++) { - ts.emplace_back(replace_fds); - } - - // Constantly replace each watch target with a new one. - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - for (auto& p : paths) { - ASSERT_THAT(unlink(p.c_str()), SyscallSucceeds()); - ASSERT_THAT(mknod(p.c_str(), S_IFREG | 0600, 0), SyscallSucceeds()); - } - sched_yield(); - } -} - -// This test helps verify that the lock order of filesystem and inotify locks -// is respected when adding/removing watches occurs concurrently with the -// removal of their targets. -TEST(InotifyTest, AddRemoveUnlinkDoNotDeadlock_NoRandomSave) { - const DisableSave ds; // Too many syscalls. - - // Set up inotify instances. - constexpr int num_fds = 3; - std::vector<int> fds(num_fds); - for (int i = 0; i < num_fds; i++) { - ASSERT_THAT(fds[i] = inotify_init1(IN_NONBLOCK), SyscallSucceeds()); - } - - // Set up initial watch targets. - std::vector<std::string> paths; - for (int i = 0; i < 3; i++) { - paths.push_back(NewTempAbsPath()); - ASSERT_THAT(mknod(paths[i].c_str(), S_IFREG | 0600, 0), SyscallSucceeds()); - } - - constexpr absl::Duration runtime = absl::Seconds(1); - - // Constantly add/remove watches for each inotify instance/watch target pair. - auto add_remove_watches = [&] { - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - for (int fd : fds) { - for (auto& p : paths) { - // Do not assert on inotify_add_watch and inotify_rm_watch. They may - // fail if the file at p was deleted. inotify_add_watch may also fail - // if another thread beat us to adding a watch. - const int wd = inotify_add_watch(fd, p.c_str(), IN_ALL_EVENTS); - if (wd > 0) { - inotify_rm_watch(fd, wd); - } - } - } - sched_yield(); - } - }; - - std::list<ScopedThread> ts; - for (int i = 0; i < 15; i++) { - ts.emplace_back(add_remove_watches); - } - - // Constantly replace each watch target with a new one. - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - for (auto& p : paths) { - ASSERT_THAT(unlink(p.c_str()), SyscallSucceeds()); - ASSERT_THAT(mknod(p.c_str(), S_IFREG | 0600, 0), SyscallSucceeds()); - } - sched_yield(); - } -} - -// This test helps verify that the lock order of filesystem and inotify locks -// is respected when many inotify events and filesystem operations occur -// simultaneously. -TEST(InotifyTest, NotifyNoDeadlock_NoRandomSave) { - const DisableSave ds; // Too many syscalls. - - const TempPath parent = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir()); - const std::string dir = parent.path(); - - // mu protects file, which will change on rename. - absl::Mutex mu; - std::string file = NewTempAbsPathInDir(dir); - ASSERT_THAT(mknod(file.c_str(), 0644 | S_IFREG, 0), SyscallSucceeds()); - - const absl::Duration runtime = absl::Milliseconds(300); - - // Add/remove watches on dir and file. - ScopedThread add_remove_watches([&] { - const FileDescriptor ifd = - ASSERT_NO_ERRNO_AND_VALUE(InotifyInit1(IN_NONBLOCK)); - int dir_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(ifd.get(), dir, IN_ALL_EVENTS)); - int file_wd; - { - absl::ReaderMutexLock l(&mu); - file_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(ifd.get(), file, IN_ALL_EVENTS)); - } - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - ASSERT_THAT(inotify_rm_watch(ifd.get(), file_wd), SyscallSucceeds()); - ASSERT_THAT(inotify_rm_watch(ifd.get(), dir_wd), SyscallSucceeds()); - dir_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(ifd.get(), dir, IN_ALL_EVENTS)); - { - absl::ReaderMutexLock l(&mu); - file_wd = ASSERT_NO_ERRNO_AND_VALUE( - InotifyAddWatch(ifd.get(), file, IN_ALL_EVENTS)); - } - sched_yield(); - } - }); - - // Modify attributes on dir and file. - ScopedThread stats([&] { - int fd, dir_fd; - { - absl::ReaderMutexLock l(&mu); - ASSERT_THAT(fd = open(file.c_str(), O_RDONLY), SyscallSucceeds()); - } - ASSERT_THAT(dir_fd = open(dir.c_str(), O_RDONLY | O_DIRECTORY), - SyscallSucceeds()); - const struct timeval times[2] = {{1, 0}, {2, 0}}; - - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - { - absl::ReaderMutexLock l(&mu); - EXPECT_THAT(utimes(file.c_str(), times), SyscallSucceeds()); - } - EXPECT_THAT(futimes(fd, times), SyscallSucceeds()); - EXPECT_THAT(utimes(dir.c_str(), times), SyscallSucceeds()); - EXPECT_THAT(futimes(dir_fd, times), SyscallSucceeds()); - sched_yield(); - } - }); - - // Modify extended attributes on dir and file. - ScopedThread xattrs([&] { - // TODO(gvisor.dev/issue/1636): Support extended attributes in runsc gofer. - if (!IsRunningOnGvisor()) { - int fd; - { - absl::ReaderMutexLock l(&mu); - ASSERT_THAT(fd = open(file.c_str(), O_RDONLY), SyscallSucceeds()); - } - - const char* name = "user.test"; - int val = 123; - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - { - absl::ReaderMutexLock l(&mu); - ASSERT_THAT( - setxattr(file.c_str(), name, &val, sizeof(val), /*flags=*/0), - SyscallSucceeds()); - ASSERT_THAT(removexattr(file.c_str(), name), SyscallSucceeds()); - } - - ASSERT_THAT(fsetxattr(fd, name, &val, sizeof(val), /*flags=*/0), - SyscallSucceeds()); - ASSERT_THAT(fremovexattr(fd, name), SyscallSucceeds()); - sched_yield(); - } - } - }); - - // Read and write file's contents. Read and write dir's entries. - ScopedThread read_write([&] { - int fd; - { - absl::ReaderMutexLock l(&mu); - ASSERT_THAT(fd = open(file.c_str(), O_RDWR), SyscallSucceeds()); - } - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - int val = 123; - ASSERT_THAT(write(fd, &val, sizeof(val)), SyscallSucceeds()); - ASSERT_THAT(read(fd, &val, sizeof(val)), SyscallSucceeds()); - TempPath new_file = - ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn(dir)); - ASSERT_NO_ERRNO(ListDir(dir, false)); - new_file.reset(); - sched_yield(); - } - }); - - // Rename file. - for (auto start = absl::Now(); absl::Now() - start < runtime;) { - const std::string new_path = NewTempAbsPathInDir(dir); - { - absl::WriterMutexLock l(&mu); - ASSERT_THAT(rename(file.c_str(), new_path.c_str()), SyscallSucceeds()); - file = new_path; - } - sched_yield(); - } -} - -} // namespace -} // namespace testing -} // namespace gvisor |