general: add sysv ipc shm test, fix ipc_msg and update sem test

[libc-test] / src / general / sem.c

diff --git a/src/general/sem.c b/src/general/sem.c
index 329164a..69ec34e 100644 (file)
--- a/src/general/sem.c
+++ b/src/general/sem.c
@@ -27,7 +27,6 @@ int main(void)
                "reopening should fail with O_EXCL\n");
        TEST(errno == EEXIST,
                "after reopen failure errno is \"%s\" (%d); want EEXIST (%d)\n", strerror(errno), errno, EEXIST);
-       errno = 0;
 
        TEST(sem_getvalue(sem, &val) == 0, "failed to get sem value\n");
        TEST(val == 1, "wrong initial semaphore value: %d\n", val);
@@ -35,10 +34,15 @@ int main(void)
        TEST((sem2=sem_open(buf, 0)) == sem,
                "could not reopen sem: got %p, want %p\n", sem2, sem);
 
+       errno = 0;
        TEST(sem_wait(sem) == 0, "%s\n", strerror(errno));
        TEST(sem_getvalue(sem2, &val) == 0, "%s\n", strerror(errno));
        TEST(val == 0, "wrong semaphore value on second handle: %d\n", val);
 
+       errno = 0;
+       TEST(sem_trywait(sem) == -1 && errno == EAGAIN,
+               "trywait on locked sem: got errno \"%s\" (%d), want EAGAIN (%d)\n", strerror(errno), errno, EAGAIN);
+
        TEST(sem_post(sem) == 0, "%s\n", strerror(errno));
        TEST(sem_getvalue(sem2, &val) == 0, "%s\n", strerror(errno));
        TEST(val == 1, "wrong semaphore value on second handle: %d\n", val);