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-rw-r--r--test/syscalls/linux/BUILD1
-rw-r--r--test/syscalls/linux/msgqueue.cc268
2 files changed, 263 insertions, 6 deletions
diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD
index bcef17528..6bea5a680 100644
--- a/test/syscalls/linux/BUILD
+++ b/test/syscalls/linux/BUILD
@@ -4172,6 +4172,7 @@ cc_binary(
srcs = ["msgqueue.cc"],
linkstatic = 1,
deps = [
+ "@com_google_absl//absl/time",
"//test/util:capability_util",
"//test/util:temp_path",
"//test/util:test_main",
diff --git a/test/syscalls/linux/msgqueue.cc b/test/syscalls/linux/msgqueue.cc
index 01a15857a..95eeb2ef9 100644
--- a/test/syscalls/linux/msgqueue.cc
+++ b/test/syscalls/linux/msgqueue.cc
@@ -17,6 +17,7 @@
#include <sys/msg.h>
#include <sys/types.h>
+#include "absl/time/clock.h"
#include "test/util/capability_util.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
@@ -63,7 +64,7 @@ constexpr size_t msgSize = 50;
// msgbuf is a simple buffer using to send and receive text messages for
// testing purposes.
struct msgbuf {
- long mtype;
+ int64_t mtype;
char mtext[msgSize];
};
@@ -234,7 +235,7 @@ TEST(MsgqueueTest, MsgRcvType) {
// Send messages in an order and receive them in reverse, based on type,
// which shouldn't block.
- std::map<long, msgbuf> typeToBuf = {
+ std::map<int64_t, msgbuf> typeToBuf = {
{1, msgbuf{1, "Message 1."}}, {2, msgbuf{2, "Message 2."}},
{3, msgbuf{3, "Message 3."}}, {4, msgbuf{4, "Message 4."}},
{5, msgbuf{5, "Message 5."}}, {6, msgbuf{6, "Message 6."}},
@@ -246,7 +247,7 @@ TEST(MsgqueueTest, MsgRcvType) {
SyscallSucceeds());
}
- for (long i = typeToBuf.size(); i > 0; i--) {
+ for (int64_t i = typeToBuf.size(); i > 0; i--) {
msgbuf rcv;
EXPECT_THAT(msgrcv(queue.get(), &rcv, sizeof(typeToBuf[i].mtext) + 1, i, 0),
SyscallSucceedsWithValue(sizeof(typeToBuf[i].mtext)));
@@ -261,7 +262,7 @@ TEST(MsgqueueTest, MsgExcept) {
Queue queue(msgget(IPC_PRIVATE, 0600));
ASSERT_THAT(queue.get(), SyscallSucceeds());
- std::map<long, msgbuf> typeToBuf = {
+ std::map<int64_t, msgbuf> typeToBuf = {
{1, msgbuf{1, "Message 1."}},
{2, msgbuf{2, "Message 2."}},
};
@@ -271,7 +272,7 @@ TEST(MsgqueueTest, MsgExcept) {
SyscallSucceeds());
}
- for (long i = typeToBuf.size(); i > 0; i--) {
+ for (int64_t i = typeToBuf.size(); i > 0; i--) {
msgbuf actual = typeToBuf[i == 1 ? 2 : 1];
msgbuf rcv;
@@ -340,7 +341,7 @@ TEST(MsgqueueTest, MsgOpLimits) {
// Use a buffer with the maximum mount of bytes that can be transformed to
// make it easier to exhaust the queue limit.
struct msgmax {
- long mtype;
+ int64_t mtype;
char mtext[msgMax];
};
@@ -416,6 +417,261 @@ TEST(MsgqueueTest, MsgCopy) {
}
}
+// Test msgrcv (most probably) blocking on an empty queue.
+TEST(MsgqueueTest, MsgRcvBlocking) {
+ SKIP_IF(!run);
+
+ Queue queue(msgget(IPC_PRIVATE, 0600));
+ ASSERT_THAT(queue.get(), SyscallSucceeds());
+
+ msgbuf buf{1, "A message."};
+
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ msgbuf rcv;
+ TEST_PCHECK(RetryEINTR(msgrcv)(queue.get(), &rcv, sizeof(buf.mtext) + 1, 0,
+ 0) == sizeof(buf.mtext) &&
+ buf == rcv);
+ _exit(0);
+ }
+
+ // Sleep to try and make msgrcv block before sending a message.
+ absl::SleepFor(absl::Milliseconds(150));
+
+ EXPECT_THAT(msgsnd(queue.get(), &buf, sizeof(buf.mtext), 0),
+ SyscallSucceeds());
+
+ int status;
+ ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, 0),
+ SyscallSucceedsWithValue(child_pid));
+ EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+}
+
+// Test msgrcv (most probably) waiting for a specific-type message.
+TEST(MsgqueueTest, MsgRcvTypeBlocking) {
+ SKIP_IF(!run);
+
+ Queue queue(msgget(IPC_PRIVATE, 0600));
+ ASSERT_THAT(queue.get(), SyscallSucceeds());
+
+ msgbuf bufs[5] = {{1, "A message."},
+ {1, "A message."},
+ {1, "A message."},
+ {1, "A message."},
+ {2, "A different message."}};
+
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ msgbuf buf = bufs[4]; // Buffer that should be received.
+ msgbuf rcv;
+ TEST_PCHECK(RetryEINTR(msgrcv)(queue.get(), &rcv, sizeof(buf.mtext) + 1, 2,
+ 0) == sizeof(buf.mtext) &&
+ buf == rcv);
+ _exit(0);
+ }
+
+ // Sleep to try and make msgrcv block before sending messages.
+ absl::SleepFor(absl::Milliseconds(150));
+
+ // Send all buffers in order, only last one should be received.
+ for (auto& buf : bufs) {
+ EXPECT_THAT(msgsnd(queue.get(), &buf, sizeof(buf.mtext), 0),
+ SyscallSucceeds());
+ }
+
+ int status;
+ ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, 0),
+ SyscallSucceedsWithValue(child_pid));
+ EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+}
+
+// Test msgsnd (most probably) blocking on a full queue.
+TEST(MsgqueueTest, MsgSndBlocking) {
+ SKIP_IF(!run);
+
+ 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
+ // sent without blocking.
+
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ // Fill the queue.
+ for (size_t i = 0; i < msgCount; i++) {
+ EXPECT_THAT(msgsnd(queue.get(), &buf, sizeof(buf.mtext), 0),
+ SyscallSucceeds());
+ }
+
+ // Next msgsnd should block.
+ TEST_PCHECK(RetryEINTR(msgsnd)(queue.get(), &buf, sizeof(buf.mtext), 0) ==
+ 0);
+ _exit(0);
+ }
+
+ // 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,
+ // the queue is filled, and most probably, a blocking msgsnd has been made.
+ msgmax rcv;
+ while (msgrcv(queue.get(), &rcv, msgMax, msgCount - 1,
+ MSG_COPY | IPC_NOWAIT) == -1 &&
+ errno == ENOMSG) {
+ }
+
+ // Delay a bit more for the blocking msgsnd.
+ absl::SleepFor(absl::Milliseconds(100));
+
+ EXPECT_THAT(msgrcv(queue.get(), &rcv, sizeof(buf.mtext) + 1, 0, 0),
+ SyscallSucceedsWithValue(sizeof(buf.mtext)));
+
+ int status;
+ ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, 0),
+ SyscallSucceedsWithValue(child_pid));
+ EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+}
+
+// Test removing a queue while a blocking msgsnd is executing.
+TEST(MsgqueueTest, MsgSndRmWhileBlocking) {
+ SKIP_IF(!run);
+
+ 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];
+ };
+
+ const size_t msgCount = msgMnb / msgMax; // Number of messages that can be
+ // sent without blocking.
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ // Fill the queue.
+ msgmax buf{1, ""};
+ for (size_t i = 0; i < msgCount; i++) {
+ EXPECT_THAT(msgsnd(queue.get(), &buf, sizeof(buf.mtext), 0),
+ SyscallSucceeds());
+ }
+
+ // Next msgsnd should block. Because we're repeating on EINTR, msgsnd may
+ // race with msgctl(IPC_RMID) and return EINVAL.
+ TEST_PCHECK(RetryEINTR(msgsnd)(queue.get(), &buf, sizeof(buf.mtext), 0) ==
+ -1 &&
+ (errno == EIDRM || errno == EINVAL));
+ _exit(0);
+ }
+
+ // Similar to MsgSndBlocking, we do this to increase the chance of msgsnd
+ // blocking before removing the queue.
+ msgmax rcv;
+ while (msgrcv(queue.get(), &rcv, msgMax, msgCount - 1,
+ MSG_COPY | IPC_NOWAIT) == -1 &&
+ errno == ENOMSG) {
+ }
+ absl::SleepFor(absl::Milliseconds(100));
+
+ EXPECT_THAT(msgctl(queue.release(), IPC_RMID, nullptr), SyscallSucceeds());
+
+ int status;
+ ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, 0),
+ SyscallSucceedsWithValue(child_pid));
+ EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+}
+
+// Test removing a queue while a blocking msgrcv is executing.
+TEST(MsgqueueTest, MsgRcvRmWhileBlocking) {
+ SKIP_IF(!run);
+
+ Queue queue(msgget(IPC_PRIVATE, 0600));
+ ASSERT_THAT(queue.get(), SyscallSucceeds());
+
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ // Because we're repeating on EINTR, msgsnd may race with msgctl(IPC_RMID)
+ // and return EINVAL.
+ msgbuf rcv;
+ TEST_PCHECK(RetryEINTR(msgrcv)(queue.get(), &rcv, 1, 2, 0) == -1 &&
+ (errno == EIDRM || errno == EINVAL));
+ _exit(0);
+ }
+
+ // Sleep to try and make msgrcv block before sending messages.
+ absl::SleepFor(absl::Milliseconds(150));
+
+ EXPECT_THAT(msgctl(queue.release(), IPC_RMID, nullptr), SyscallSucceeds());
+
+ int status;
+ ASSERT_THAT(RetryEINTR(waitpid)(child_pid, &status, 0),
+ SyscallSucceedsWithValue(child_pid));
+ EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+}
+
+// Test a collection of msgsnd/msgrcv operations in different processes.
+TEST(MsgqueueTest, MsgOpGeneral) {
+ SKIP_IF(!run);
+
+ Queue queue(msgget(IPC_PRIVATE, 0600));
+ ASSERT_THAT(queue.get(), SyscallSucceeds());
+
+ // Create 50 sending, and 50 receiving processes. There are only 5 messages to
+ // be sent and received, each with a different type. All messages will be sent
+ // and received equally (10 of each.) By the end of the test all processes
+ // should unblock and return normally.
+ const size_t msgCount = 5;
+ std::map<int64_t, msgbuf> typeToBuf = {{1, msgbuf{1, "Message 1."}},
+ {2, msgbuf{2, "Message 2."}},
+ {3, msgbuf{3, "Message 3."}},
+ {4, msgbuf{4, "Message 4."}},
+ {5, msgbuf{5, "Message 5."}}};
+
+ std::vector<pid_t> children;
+
+ const size_t pCount = 50;
+ for (size_t i = 1; i <= pCount; i++) {
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ msgbuf buf = typeToBuf[(i % msgCount) + 1];
+ msgbuf rcv;
+ TEST_PCHECK(RetryEINTR(msgrcv)(queue.get(), &rcv, sizeof(buf.mtext) + 1,
+ (i % msgCount) + 1,
+ 0) == sizeof(buf.mtext) &&
+ buf == rcv);
+ _exit(0);
+ }
+ children.push_back(child_pid);
+ }
+
+ for (size_t i = 1; i <= pCount; i++) {
+ const pid_t child_pid = fork();
+ if (child_pid == 0) {
+ msgbuf buf = typeToBuf[(i % msgCount) + 1];
+ TEST_PCHECK(RetryEINTR(msgsnd)(queue.get(), &buf, sizeof(buf.mtext), 0) ==
+ 0);
+ _exit(0);
+ }
+ children.push_back(child_pid);
+ }
+
+ for (auto const& pid : children) {
+ int status;
+ ASSERT_THAT(RetryEINTR(waitpid)(pid, &status, 0),
+ SyscallSucceedsWithValue(pid));
+ EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
+ }
+}
+
} // namespace
} // namespace testing
} // namespace gvisor
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 01:08:48 +0000