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-rw-r--r--test/syscalls/linux/BUILD3
-rw-r--r--test/syscalls/linux/msgqueue.cc138
2 files changed, 118 insertions, 23 deletions
diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD
index b7e83b5de..71cc9b51d 100644
--- a/test/syscalls/linux/BUILD
+++ b/test/syscalls/linux/BUILD
@@ -4173,10 +4173,11 @@ cc_binary(
linkstatic = 1,
deps = [
"//test/util:capability_util",
+ "//test/util:signal_util",
"//test/util:temp_path",
- "//test/util:test_main",
"//test/util:test_util",
"//test/util:thread_util",
+ "@com_google_absl//absl/synchronization",
"@com_google_absl//absl/time",
],
)
diff --git a/test/syscalls/linux/msgqueue.cc b/test/syscalls/linux/msgqueue.cc
index cc4022077..8994b739a 100644
--- a/test/syscalls/linux/msgqueue.cc
+++ b/test/syscalls/linux/msgqueue.cc
@@ -13,12 +13,15 @@
// limitations under the License.
#include <errno.h>
+#include <signal.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/types.h>
+#include "absl/synchronization/notification.h"
#include "absl/time/clock.h"
#include "test/util/capability_util.h"
+#include "test/util/signal_util.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
@@ -31,6 +34,8 @@ constexpr int msgMax = 8192; // Max size for message in bytes.
constexpr int msgMni = 32000; // Max number of identifiers.
constexpr int msgMnb = 16384; // Default max size of message queue in bytes.
+constexpr int kInterruptSignal = SIGALRM;
+
// Queue is a RAII class used to automatically clean message queues.
class Queue {
public:
@@ -73,6 +78,12 @@ bool operator==(msgbuf& a, msgbuf& b) {
return a.mtype == b.mtype;
}
+// msgmax represents a buffer for the largest possible single message.
+struct msgmax {
+ int64_t mtype;
+ char mtext[msgMax];
+};
+
// Test simple creation and retrieval for msgget(2).
TEST(MsgqueueTest, MsgGet) {
const TempPath keyfile = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
@@ -310,13 +321,6 @@ TEST(MsgqueueTest, MsgOpLimits) {
SyscallFailsWithErrno(EINVAL));
// Limit for queue.
- // Use a buffer with the maximum mount of bytes that can be transformed to
- // make it easier to exhaust the queue limit.
- struct msgmax {
- int64_t mtype;
- char mtext[msgMax];
- };
-
msgmax limit{1, ""};
for (size_t i = 0, msgCount = msgMnb / msgMax; i < msgCount; i++) {
EXPECT_THAT(msgsnd(queue.get(), &limit, sizeof(limit.mtext), 0),
@@ -470,13 +474,6 @@ TEST(MsgqueueTest, MsgSndBlocking) {
Queue queue(msgget(IPC_PRIVATE, 0600));
ASSERT_THAT(queue.get(), SyscallSucceeds());
- // Use a buffer with the maximum mount of bytes that can be transformed to
- // make it easier to exhaust the queue limit.
- struct msgmax {
- int64_t mtype;
- char mtext[msgMax];
- };
-
msgmax buf{1, ""}; // Has max amount of bytes.
const size_t msgCount = msgMnb / msgMax; // Number of messages that can be
@@ -494,6 +491,8 @@ TEST(MsgqueueTest, MsgSndBlocking) {
SyscallSucceeds());
});
+ const DisableSave ds; // Too many syscalls.
+
// To increase the chance of the last msgsnd blocking before doing a msgrcv,
// we use MSG_COPY option to copy the last index in the queue. As long as
// MSG_COPY fails, the queue hasn't yet been filled. When MSG_COPY succeeds,
@@ -516,15 +515,9 @@ TEST(MsgqueueTest, MsgSndRmWhileBlocking) {
Queue queue(msgget(IPC_PRIVATE, 0600));
ASSERT_THAT(queue.get(), SyscallSucceeds());
- // Use a buffer with the maximum mount of bytes that can be transformed to
- // make it easier to exhaust the queue limit.
- struct msgmax {
- int64_t mtype;
- char mtext[msgMax];
- };
+ // Number of messages that can be sent without blocking.
+ const size_t msgCount = msgMnb / msgMax;
- const size_t msgCount = msgMnb / msgMax; // Number of messages that can be
- // sent without blocking.
ScopedThread t([&] {
// Fill the queue.
msgmax buf{1, ""};
@@ -540,6 +533,8 @@ TEST(MsgqueueTest, MsgSndRmWhileBlocking) {
EXPECT_TRUE((errno == EIDRM || errno == EINVAL));
});
+ const DisableSave ds; // Too many syscalls.
+
// Similar to MsgSndBlocking, we do this to increase the chance of msgsnd
// blocking before removing the queue.
msgmax rcv;
@@ -627,6 +622,105 @@ TEST(MsgqueueTest, MsgOpGeneral) {
ScopedThread s10(sender(4));
}
+void empty_sighandler(int sig, siginfo_t* info, void* context) {}
+
+TEST(MsgqueueTest, InterruptRecv) {
+ Queue queue(msgget(IPC_PRIVATE, 0600));
+ char buf[64];
+
+ absl::Notification done, exit;
+
+ // Thread calling msgrcv with no corresponding send. It would block forever,
+ // but we'll interrupt with a signal below.
+ ScopedThread t([&] {
+ struct sigaction sa = {};
+ sa.sa_sigaction = empty_sighandler;
+ sigfillset(&sa.sa_mask);
+ sa.sa_flags = SA_SIGINFO;
+ auto cleanup_sigaction =
+ ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(kInterruptSignal, sa));
+ auto sa_cleanup = ASSERT_NO_ERRNO_AND_VALUE(
+ ScopedSignalMask(SIG_UNBLOCK, kInterruptSignal));
+
+ EXPECT_THAT(msgrcv(queue.get(), &buf, sizeof(buf), 0, 0),
+ SyscallFailsWithErrno(EINTR));
+
+ done.Notify();
+ exit.WaitForNotification();
+ });
+
+ const DisableSave ds; // Too many syscalls.
+
+ // We want the signal to arrive while msgrcv is blocking, but not after the
+ // thread has exited. Signals that arrive before msgrcv are no-ops.
+ do {
+ EXPECT_THAT(kill(getpid(), kInterruptSignal), SyscallSucceeds());
+ absl::SleepFor(absl::Milliseconds(100)); // Rate limit.
+ } while (!done.HasBeenNotified());
+
+ exit.Notify();
+ t.Join();
+}
+
+TEST(MsgqueueTest, InterruptSend) {
+ Queue queue(msgget(IPC_PRIVATE, 0600));
+ msgmax buf{1, ""};
+ // Number of messages that can be sent without blocking.
+ const size_t msgCount = msgMnb / msgMax;
+
+ // Fill the queue.
+ for (size_t i = 0; i < msgCount; i++) {
+ ASSERT_THAT(msgsnd(queue.get(), &buf, sizeof(buf.mtext), 0),
+ SyscallSucceeds());
+ }
+
+ absl::Notification done, exit;
+
+ // Thread calling msgsnd on a full queue. It would block forever, but we'll
+ // interrupt with a signal below.
+ ScopedThread t([&] {
+ struct sigaction sa = {};
+ sa.sa_sigaction = empty_sighandler;
+ sigfillset(&sa.sa_mask);
+ sa.sa_flags = SA_SIGINFO;
+ auto cleanup_sigaction =
+ ASSERT_NO_ERRNO_AND_VALUE(ScopedSigaction(kInterruptSignal, sa));
+ auto sa_cleanup = ASSERT_NO_ERRNO_AND_VALUE(
+ ScopedSignalMask(SIG_UNBLOCK, kInterruptSignal));
+
+ EXPECT_THAT(msgsnd(queue.get(), &buf, sizeof(buf.mtext), 0),
+ SyscallFailsWithErrno(EINTR));
+
+ done.Notify();
+ exit.WaitForNotification();
+ });
+
+ const DisableSave ds; // Too many syscalls.
+
+ // We want the signal to arrive while msgsnd is blocking, but not after the
+ // thread has exited. Signals that arrive before msgsnd are no-ops.
+ do {
+ EXPECT_THAT(kill(getpid(), kInterruptSignal), SyscallSucceeds());
+ absl::SleepFor(absl::Milliseconds(100)); // Rate limit.
+ } while (!done.HasBeenNotified());
+
+ exit.Notify();
+ t.Join();
+}
+
} // namespace
} // namespace testing
} // namespace gvisor
+
+int main(int argc, char** argv) {
+ // Some tests depend on delivering a signal to the main thread. Block the
+ // target signal so that any other threads created by TestInit will also have
+ // the signal blocked.
+ sigset_t set;
+ sigemptyset(&set);
+ sigaddset(&set, gvisor::testing::kInterruptSignal);
+ TEST_PCHECK(sigprocmask(SIG_BLOCK, &set, nullptr) == 0);
+
+ gvisor::testing::TestInit(&argc, &argv);
+ return gvisor::testing::RunAllTests();
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 14:42:12 +0000