diff options
Diffstat (limited to 'test/syscalls/linux/priority.cc')
| -rw-r--r-- | test/syscalls/linux/priority.cc | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/test/syscalls/linux/priority.cc b/test/syscalls/linux/priority.cc deleted file mode 100644 index 1d9bdfa70..000000000 --- a/test/syscalls/linux/priority.cc +++ /dev/null @@ -1,216 +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 <sys/resource.h> -#include <sys/time.h> -#include <sys/types.h> -#include <unistd.h> - -#include <string> -#include <vector> - -#include "gtest/gtest.h" -#include "absl/strings/numbers.h" -#include "absl/strings/str_split.h" -#include "test/util/capability_util.h" -#include "test/util/fs_util.h" -#include "test/util/test_util.h" -#include "test/util/thread_util.h" - -namespace gvisor { -namespace testing { - -namespace { - -// These tests are for both the getpriority(2) and setpriority(2) syscalls -// These tests are very rudimentary because getpriority and setpriority -// have not yet been fully implemented. - -// Getpriority does something -TEST(GetpriorityTest, Implemented) { - // "getpriority() can legitimately return the value -1, it is necessary to - // clear the external variable errno prior to the call" - errno = 0; - EXPECT_THAT(getpriority(PRIO_PROCESS, /*who=*/0), SyscallSucceeds()); -} - -// Invalid which -TEST(GetpriorityTest, InvalidWhich) { - errno = 0; - EXPECT_THAT(getpriority(/*which=*/3, /*who=*/0), - SyscallFailsWithErrno(EINVAL)); -} - -// Process is found when which=PRIO_PROCESS -TEST(GetpriorityTest, ValidWho) { - errno = 0; - EXPECT_THAT(getpriority(PRIO_PROCESS, getpid()), SyscallSucceeds()); -} - -// Process is not found when which=PRIO_PROCESS -TEST(GetpriorityTest, InvalidWho) { - errno = 0; - // Flaky, but it's tough to avoid a race condition when finding an unused pid - EXPECT_THAT(getpriority(PRIO_PROCESS, /*who=*/INT_MAX - 1), - SyscallFailsWithErrno(ESRCH)); -} - -// Setpriority does something -TEST(SetpriorityTest, Implemented) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - // No need to clear errno for setpriority(): - // "The setpriority() call returns 0 if there is no error, or -1 if there is" - EXPECT_THAT(setpriority(PRIO_PROCESS, /*who=*/0, /*nice=*/16), - SyscallSucceeds()); -} - -// Invalid which -TEST(Setpriority, InvalidWhich) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - EXPECT_THAT(setpriority(/*which=*/3, /*who=*/0, /*nice=*/16), - SyscallFailsWithErrno(EINVAL)); -} - -// Process is found when which=PRIO_PROCESS -TEST(SetpriorityTest, ValidWho) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - EXPECT_THAT(setpriority(PRIO_PROCESS, getpid(), /*nice=*/16), - SyscallSucceeds()); -} - -// niceval is within the range [-20, 19] -TEST(SetpriorityTest, InsideRange) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - // Set 0 < niceval < 19 - int nice = 12; - EXPECT_THAT(setpriority(PRIO_PROCESS, getpid(), nice), SyscallSucceeds()); - - errno = 0; - EXPECT_THAT(getpriority(PRIO_PROCESS, getpid()), - SyscallSucceedsWithValue(nice)); - - // Set -20 < niceval < 0 - nice = -12; - EXPECT_THAT(setpriority(PRIO_PROCESS, getpid(), nice), SyscallSucceeds()); - - errno = 0; - EXPECT_THAT(getpriority(PRIO_PROCESS, getpid()), - SyscallSucceedsWithValue(nice)); -} - -// Verify that priority/niceness are exposed via /proc/PID/stat. -TEST(SetpriorityTest, NicenessExposedViaProcfs) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - constexpr int kNiceVal = 12; - ASSERT_THAT(setpriority(PRIO_PROCESS, getpid(), kNiceVal), SyscallSucceeds()); - - errno = 0; - ASSERT_THAT(getpriority(PRIO_PROCESS, getpid()), - SyscallSucceedsWithValue(kNiceVal)); - - // Now verify we can read that same value via /proc/self/stat. - std::string proc_stat; - ASSERT_NO_ERRNO(GetContents("/proc/self/stat", &proc_stat)); - std::vector<std::string> pieces = absl::StrSplit(proc_stat, ' '); - ASSERT_GT(pieces.size(), 20); - - int niceness_procfs = 0; - ASSERT_TRUE(absl::SimpleAtoi(pieces[18], &niceness_procfs)); - EXPECT_EQ(niceness_procfs, kNiceVal); -} - -// In the kernel's implementation, values outside the range of [-20, 19] are -// truncated to these minimum and maximum values. See -// https://elixir.bootlin.com/linux/v4.4/source/kernel/sys.c#L190 -TEST(SetpriorityTest, OutsideRange) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - // Set niceval > 19 - EXPECT_THAT(setpriority(PRIO_PROCESS, getpid(), /*nice=*/100), - SyscallSucceeds()); - - errno = 0; - // Test niceval truncated to 19 - EXPECT_THAT(getpriority(PRIO_PROCESS, getpid()), - SyscallSucceedsWithValue(/*maxnice=*/19)); - - // Set niceval < -20 - EXPECT_THAT(setpriority(PRIO_PROCESS, getpid(), /*nice=*/-100), - SyscallSucceeds()); - - errno = 0; - // Test niceval truncated to -20 - EXPECT_THAT(getpriority(PRIO_PROCESS, getpid()), - SyscallSucceedsWithValue(/*minnice=*/-20)); -} - -// Process is not found when which=PRIO_PROCESS -TEST(SetpriorityTest, InvalidWho) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - // Flaky, but it's tough to avoid a race condition when finding an unused pid - EXPECT_THAT(setpriority(PRIO_PROCESS, - /*who=*/INT_MAX - 1, - /*nice=*/16), - SyscallFailsWithErrno(ESRCH)); -} - -// Nice succeeds, correctly modifies (or in this case does not -// modify priority of process -TEST(SetpriorityTest, NiceSucceeds) { - errno = 0; - const int priority_before = getpriority(PRIO_PROCESS, /*who=*/0); - ASSERT_THAT(nice(/*inc=*/0), SyscallSucceeds()); - - // nice(0) should not change priority - EXPECT_EQ(priority_before, getpriority(PRIO_PROCESS, /*who=*/0)); -} - -// Threads resulting from clone() maintain parent's priority -// Changes to child priority do not affect parent's priority -TEST(GetpriorityTest, CloneMaintainsPriority) { - SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_NICE))); - - constexpr int kParentPriority = 16; - constexpr int kChildPriority = 14; - ASSERT_THAT(setpriority(PRIO_PROCESS, getpid(), kParentPriority), - SyscallSucceeds()); - - ScopedThread th([]() { - // Check that priority equals that of parent thread - pid_t my_tid; - EXPECT_THAT(my_tid = syscall(__NR_gettid), SyscallSucceeds()); - EXPECT_THAT(getpriority(PRIO_PROCESS, my_tid), - SyscallSucceedsWithValue(kParentPriority)); - - // Change the child thread's priority - EXPECT_THAT(setpriority(PRIO_PROCESS, my_tid, kChildPriority), - SyscallSucceeds()); - }); - th.Join(); - - // Check that parent's priority reemained the same even though - // the child's priority was altered - EXPECT_EQ(kParentPriority, getpriority(PRIO_PROCESS, syscall(__NR_gettid))); -} - -} // namespace - -} // namespace testing -} // namespace gvisor |