static void
sigchld_handler(int signo __unused)
{
struct shmid_ds s_ds;
int cstatus;
/*
* Reap the child; if it exited successfully, then the test passed!
*/
if (waitpid(child_pid, &cstatus, 0) != child_pid)
err(1, "waitpid");
if (WIFEXITED(cstatus) == 0)
errx(1, "receiver exited abnormally");
if (WEXITSTATUS(cstatus) != 0)
errx(1, "receiver exited with status %d",
WEXITSTATUS(cstatus));
/*
* If we get here, the child has exited normally, and thus
* we should exit normally too. First, tho, we print out
* the final stats for the message queue.
*/
if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
err(1, "shmctl IPC_STAT");
print_shmid_ds(&s_ds, 0600);
exit(0);
}
int
main(int argc, char *argv[])
{
struct sigaction sa;
struct shmid_ds s_ds;
sigset_t sigmask;
char *shm_buf;
if (argc != 2)
usage();
/*
* Install a SIGSYS handler so that we can exit gracefully if
* System V Shared Memory support isn't in the kernel.
*/
sa.sa_handler = sigsys_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGSYS, &sa, NULL) == -1)
err(1, "sigaction SIGSYS");
/*
* Install and SIGCHLD handler to deal with all possible exit
* conditions of the receiver.
*/
sa.sa_handler = sigchld_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGCHLD, &sa, NULL) == -1)
err(1, "sigaction SIGCHLD");
pgsize = sysconf(_SC_PAGESIZE);
shmkey = ftok(argv[1], 4160);
/*
* Initialize child_pid to ourselves to that the cleanup function
* works before we create the receiver.
*/
child_pid = getpid();
/*
* Make sure that when the sender exits, the message queue is
* removed.
*/
if (atexit(cleanup) == -1)
err(1, "atexit");
if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
err(1, "shmget");
if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
err(1, "shmctl IPC_STAT");
print_shmid_ds(&s_ds, 0640);
s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
err(1, "shmctl IPC_SET");
memset(&s_ds, 0, sizeof(s_ds));
if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
err(1, "shmctl IPC_STAT");
if ((s_ds.shm_perm.mode & 0777) != 0600)
err(1, "IPC_SET of mode didn't hold");
print_shmid_ds(&s_ds, 0600);
if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
err(1, "sender: shmat");
/*
* Write the test pattern into the shared memory buffer.
*/
strcpy(shm_buf, m_str);
switch ((child_pid = fork())) {
case -1:
err(1, "fork");
/* NOTREACHED */
case 0:
receiver();
break;
default:
break;
}
/*
* Suspend forever; when we get SIGCHLD, the handler will exit.
*/
sigemptyset(&sigmask);
(void) sigsuspend(&sigmask);
/*
* ...and any other signal is an unexpected error.
*/
errx(1, "sender: received unexpected signal");
}
ATF_TC_BODY(shm, tc)
{
struct sigaction sa;
struct shmid_ds s_ds;
sigset_t sigmask;
char *shm_buf;
int sender_shmid;
int c_status;
/*
* Install a SIGSYS handler so that we can exit gracefully if
* System V Shared Memory support isn't in the kernel.
*/
did_sigsys = 0;
sa.sa_handler = sigsys_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
ATF_REQUIRE_MSG(sigaction(SIGSYS, &sa, NULL) != -1,
"sigaction SIGSYS: %d", errno);
/*
* Install a SIGCHLD handler to deal with all possible exit
* conditions of the sharer.
*/
did_sigchild = 0;
child_count = 0;
sa.sa_handler = sigchld_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
ATF_REQUIRE_MSG(sigaction(SIGCHLD, &sa, NULL) != -1,
"sigaction SIGCHLD: %d", errno);
pgsize = sysconf(_SC_PAGESIZE);
shmkey = get_ftok(4160);
ATF_REQUIRE_MSG(shmkey != (key_t)-1, "get_ftok failed");
ATF_REQUIRE_MSG((sender_shmid = shmget(shmkey, pgsize,
IPC_CREAT | 0640)) != -1,
"shmget: %d", errno);
write_int("sender_shmid", sender_shmid);
ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_STAT, &s_ds) != -1,
"shmctl IPC_STAT: %d", errno);
print_shmid_ds(&s_ds, 0640);
s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_SET, &s_ds) != -1,
"shmctl IPC_SET: %d", errno);
memset(&s_ds, 0, sizeof(s_ds));
ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_STAT, &s_ds) != -1,
"shmctl IPC_STAT: %d", errno);
ATF_REQUIRE_MSG((s_ds.shm_perm.mode & 0777) == 0600,
"IPC_SET of mode didn't hold");
print_shmid_ds(&s_ds, 0600);
shm_buf = shmat(sender_shmid, NULL, 0);
ATF_REQUIRE_MSG(shm_buf != (void *) -1, "sender: shmat: %d", errno);
/*
* Write the test pattern into the shared memory buffer.
*/
strcpy(shm_buf, m2_str);
switch ((child_pid = fork())) {
case -1:
atf_tc_fail("fork: %d", errno);
return;
case 0:
sharer();
break;
default:
break;
}
/*
* Wait for child to finish
*/
sigemptyset(&sigmask);
(void) sigsuspend(&sigmask);
if (did_sigchild) {
c_status = child_status;
if (c_status < 0)
atf_tc_fail("waitpid: %d", -c_status);
else if (WIFEXITED(c_status) == 0)
atf_tc_fail("c abnormal exit: %d", c_status);
else if (WEXITSTATUS(c_status) != 0)
atf_tc_fail("c status: %d", WEXITSTATUS(c_status));
else {
ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_STAT,
&s_ds) != -1,
"shmctl IPC_STAT: %d", errno);
print_shmid_ds(&s_ds, 0600);
atf_tc_pass();
}
} else
atf_tc_fail("sender: received unexpected signal");
}
