glibc/posix/tst-waitid.c

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/* Tests for waitid.
Copyright (C) 2004-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#define TIMEOUT 15
static void
test_child (void)
{
/* Wait a second to be sure the parent set his variables before we
produce a SIGCHLD. */
sleep (1);
/* First thing, we stop ourselves. */
raise (SIGSTOP);
/* Hey, we got continued! */
while (1)
pause ();
}
#ifndef WEXITED
# define WEXITED 0
# define WCONTINUED 0
# define WSTOPPED WUNTRACED
#endif
static sig_atomic_t expecting_sigchld, spurious_sigchld;
#ifdef SA_SIGINFO
static siginfo_t sigchld_info;
static void
sigchld (int signo, siginfo_t *info, void *ctx)
{
if (signo != SIGCHLD)
{
printf ("SIGCHLD handler got signal %d instead!\n", signo);
_exit (EXIT_FAILURE);
}
if (! expecting_sigchld)
{
spurious_sigchld = 1;
printf ("spurious SIGCHLD: signo %d code %d status %d pid %d\n",
info->si_signo, info->si_code, info->si_status, info->si_pid);
}
else
{
sigchld_info = *info;
expecting_sigchld = 0;
}
}
static void
check_sigchld (const char *phase, int *ok, int code, int status, pid_t pid)
{
if (expecting_sigchld)
{
printf ("missing SIGCHLD on %s\n", phase);
*ok = EXIT_FAILURE;
expecting_sigchld = 0;
return;
}
if (sigchld_info.si_signo != SIGCHLD)
{
printf ("SIGCHLD for %s signal %d\n", phase, sigchld_info.si_signo);
*ok = EXIT_FAILURE;
}
if (sigchld_info.si_code != code)
{
printf ("SIGCHLD for %s code %d\n", phase, sigchld_info.si_code);
*ok = EXIT_FAILURE;
}
if (sigchld_info.si_status != status)
{
printf ("SIGCHLD for %s status %d\n", phase, sigchld_info.si_status);
*ok = EXIT_FAILURE;
}
if (sigchld_info.si_pid != pid)
{
printf ("SIGCHLD for %s pid %d\n", phase, sigchld_info.si_pid);
*ok = EXIT_FAILURE;
}
}
# define CHECK_SIGCHLD(phase, code_check, status_check) \
check_sigchld ((phase), &status, (code_check), (status_check), pid)
#else
# define CHECK_SIGCHLD(phase, code, status) ((void) 0)
#endif
static int
do_test (int argc, char *argv[])
{
#ifdef SA_SIGINFO
struct sigaction sa;
sa.sa_flags = SA_SIGINFO|SA_RESTART;
sa.sa_sigaction = &sigchld;
if (sigemptyset (&sa.sa_mask) < 0 || sigaction (SIGCHLD, &sa, NULL) < 0)
{
printf ("setting SIGCHLD handler: %m\n");
return EXIT_FAILURE;
}
#endif
expecting_sigchld = 1;
pid_t pid = fork ();
if (pid < 0)
{
printf ("fork: %m\n");
return EXIT_FAILURE;
}
else if (pid == 0)
{
test_child ();
_exit (127);
}
int status = EXIT_SUCCESS;
#define RETURN(ok) \
do { if (status == EXIT_SUCCESS) status = (ok); goto out; } while (0)
/* Give the child a chance to stop. */
sleep (3);
CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);
/* Now try a wait that should not succeed. */
siginfo_t info;
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
int fail = waitid (P_PID, pid, &info, WEXITED|WCONTINUED|WNOHANG);
switch (fail)
{
default:
printf ("waitid returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WNOHANG on stopped: %m\n");
RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
case 0:
if (info.si_signo == 0)
break;
if (info.si_signo == SIGCHLD)
printf ("waitid WNOHANG on stopped status %d\n", info.si_status);
else
printf ("waitid WNOHANG on stopped signal %d\n", info.si_signo);
RETURN (EXIT_FAILURE);
}
/* Next the wait that should succeed right away. */
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
info.si_pid = -1;
info.si_status = -1;
fail = waitid (P_PID, pid, &info, WSTOPPED|WNOHANG);
switch (fail)
{
default:
printf ("waitid WSTOPPED|WNOHANG returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WSTOPPED|WNOHANG on stopped: %m\n");
RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
case 0:
if (info.si_signo != SIGCHLD)
{
printf ("waitid WSTOPPED|WNOHANG on stopped signal %d\n",
info.si_signo);
RETURN (EXIT_FAILURE);
}
if (info.si_code != CLD_STOPPED)
{
printf ("waitid WSTOPPED|WNOHANG on stopped code %d\n",
info.si_code);
RETURN (EXIT_FAILURE);
}
if (info.si_status != SIGSTOP)
{
printf ("waitid WSTOPPED|WNOHANG on stopped status %d\n",
info.si_status);
RETURN (EXIT_FAILURE);
}
if (info.si_pid != pid)
{
printf ("waitid WSTOPPED|WNOHANG on stopped pid %d != %d\n",
info.si_pid, pid);
RETURN (EXIT_FAILURE);
}
}
expecting_sigchld = WCONTINUED != 0;
if (kill (pid, SIGCONT) != 0)
{
printf ("kill (%d, SIGCONT): %m\n", pid);
RETURN (EXIT_FAILURE);
}
/* Wait for the child to have continued. */
sleep (2);
#if WCONTINUED != 0
if (expecting_sigchld)
{
printf ("no SIGCHLD seen for SIGCONT (optional)\n");
expecting_sigchld = 0;
}
else
CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
info.si_pid = -1;
info.si_status = -1;
fail = waitid (P_PID, pid, &info, WCONTINUED|WNOWAIT);
switch (fail)
{
default:
printf ("waitid WCONTINUED|WNOWAIT returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WCONTINUED|WNOWAIT on continued: %m\n");
RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
case 0:
if (info.si_signo != SIGCHLD)
{
printf ("waitid WCONTINUED|WNOWAIT on continued signal %d\n",
info.si_signo);
RETURN (EXIT_FAILURE);
}
if (info.si_code != CLD_CONTINUED)
{
printf ("waitid WCONTINUED|WNOWAIT on continued code %d\n",
info.si_code);
RETURN (EXIT_FAILURE);
}
if (info.si_status != SIGCONT)
{
printf ("waitid WCONTINUED|WNOWAIT on continued status %d\n",
info.si_status);
RETURN (EXIT_FAILURE);
}
if (info.si_pid != pid)
{
printf ("waitid WCONTINUED|WNOWAIT on continued pid %d != %d\n",
info.si_pid, pid);
RETURN (EXIT_FAILURE);
}
}
/* That should leave the CLD_CONTINUED state waiting to be seen again. */
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
info.si_pid = -1;
info.si_status = -1;
fail = waitid (P_PID, pid, &info, WCONTINUED);
switch (fail)
{
default:
printf ("waitid WCONTINUED returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WCONTINUED on continued: %m\n");
RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
case 0:
if (info.si_signo != SIGCHLD)
{
printf ("waitid WCONTINUED on continued signal %d\n", info.si_signo);
RETURN (EXIT_FAILURE);
}
if (info.si_code != CLD_CONTINUED)
{
printf ("waitid WCONTINUED on continued code %d\n", info.si_code);
RETURN (EXIT_FAILURE);
}
if (info.si_status != SIGCONT)
{
printf ("waitid WCONTINUED on continued status %d\n",
info.si_status);
RETURN (EXIT_FAILURE);
}
if (info.si_pid != pid)
{
printf ("waitid WCONTINUED on continued pid %d != %d\n",
info.si_pid, pid);
RETURN (EXIT_FAILURE);
}
}
/* Now try a wait that should not succeed. */
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
fail = waitid (P_PID, pid, &info, WCONTINUED|WNOHANG);
switch (fail)
{
default:
printf ("waitid returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WCONTINUED|WNOHANG on waited continued: %m\n");
RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
case 0:
if (info.si_signo == 0)
break;
if (info.si_signo == SIGCHLD)
printf ("waitid WCONTINUED|WNOHANG on waited continued status %d\n",
info.si_status);
else
printf ("waitid WCONTINUED|WNOHANG on waited continued signal %d\n",
info.si_signo);
RETURN (EXIT_FAILURE);
}
/* Now stop him again and test waitpid with WCONTINUED. */
expecting_sigchld = 1;
if (kill (pid, SIGSTOP) != 0)
{
printf ("kill (%d, SIGSTOP): %m\n", pid);
RETURN (EXIT_FAILURE);
}
pid_t wpid = waitpid (pid, &fail, WUNTRACED);
if (wpid < 0)
{
printf ("waitpid WUNTRACED on stopped: %m\n");
RETURN (EXIT_FAILURE);
}
else if (wpid != pid)
{
printf ("waitpid WUNTRACED on stopped returned %d != %d (status %x)\n",
wpid, pid, fail);
RETURN (EXIT_FAILURE);
}
else if (!WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail)
|| WIFCONTINUED (fail) || WSTOPSIG (fail) != SIGSTOP)
{
printf ("waitpid WUNTRACED on stopped: status %x\n", fail);
RETURN (EXIT_FAILURE);
}
CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);
expecting_sigchld = 1;
if (kill (pid, SIGCONT) != 0)
{
printf ("kill (%d, SIGCONT): %m\n", pid);
RETURN (EXIT_FAILURE);
}
/* Wait for the child to have continued. */
sleep (2);
if (expecting_sigchld)
{
printf ("no SIGCHLD seen for SIGCONT (optional)\n");
expecting_sigchld = 0;
}
else
CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);
wpid = waitpid (pid, &fail, WCONTINUED);
if (wpid < 0)
{
if (errno == EINVAL)
printf ("waitpid does not support WCONTINUED\n");
else
{
printf ("waitpid WCONTINUED on continued: %m\n");
RETURN (EXIT_FAILURE);
}
}
else if (wpid != pid)
{
printf ("\
waitpid WCONTINUED on continued returned %d != %d (status %x)\n",
wpid, pid, fail);
RETURN (EXIT_FAILURE);
}
else if (WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail)
|| !WIFCONTINUED (fail))
{
printf ("waitpid WCONTINUED on continued: status %x\n", fail);
RETURN (EXIT_FAILURE);
}
#endif
expecting_sigchld = 1;
/* Die, child, die! */
if (kill (pid, SIGKILL) != 0)
{
printf ("kill (%d, SIGKILL): %m\n", pid);
RETURN (EXIT_FAILURE);
}
#ifdef WNOWAIT
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
info.si_pid = -1;
info.si_status = -1;
fail = waitid (P_PID, pid, &info, WEXITED|WNOWAIT);
switch (fail)
{
default:
printf ("waitid WNOWAIT returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WNOWAIT on killed: %m\n");
RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
case 0:
if (info.si_signo != SIGCHLD)
{
printf ("waitid WNOWAIT on killed signal %d\n", info.si_signo);
RETURN (EXIT_FAILURE);
}
if (info.si_code != CLD_KILLED)
{
printf ("waitid WNOWAIT on killed code %d\n", info.si_code);
RETURN (EXIT_FAILURE);
}
if (info.si_status != SIGKILL)
{
printf ("waitid WNOWAIT on killed status %d\n", info.si_status);
RETURN (EXIT_FAILURE);
}
if (info.si_pid != pid)
{
printf ("waitid WNOWAIT on killed pid %d != %d\n", info.si_pid, pid);
RETURN (EXIT_FAILURE);
}
}
#else
/* Allow enough time to be sure the child died; we didn't synchronize. */
sleep (2);
#endif
CHECK_SIGCHLD ("killed", CLD_KILLED, SIGKILL);
info.si_signo = 0; /* A successful call sets it to SIGCHLD. */
info.si_pid = -1;
info.si_status = -1;
fail = waitid (P_PID, pid, &info, WEXITED|WNOHANG);
switch (fail)
{
default:
printf ("waitid WNOHANG returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
case -1:
printf ("waitid WNOHANG on killed: %m\n");
RETURN (EXIT_FAILURE);
case 0:
if (info.si_signo != SIGCHLD)
{
printf ("waitid WNOHANG on killed signal %d\n", info.si_signo);
RETURN (EXIT_FAILURE);
}
if (info.si_code != CLD_KILLED)
{
printf ("waitid WNOHANG on killed code %d\n", info.si_code);
RETURN (EXIT_FAILURE);
}
if (info.si_status != SIGKILL)
{
printf ("waitid WNOHANG on killed status %d\n", info.si_status);
RETURN (EXIT_FAILURE);
}
if (info.si_pid != pid)
{
printf ("waitid WNOHANG on killed pid %d != %d\n", info.si_pid, pid);
RETURN (EXIT_FAILURE);
}
}
fail = waitid (P_PID, pid, &info, WEXITED);
if (fail == -1)
{
if (errno != ECHILD)
{
printf ("waitid WEXITED on killed: %m\n");
RETURN (EXIT_FAILURE);
}
}
else
{
printf ("waitid WEXITED returned bogus value %d\n", fail);
RETURN (EXIT_FAILURE);
}
#undef RETURN
out:
if (spurious_sigchld)
status = EXIT_FAILURE;
signal (SIGCHLD, SIG_IGN);
kill (pid, SIGKILL); /* Make sure it's dead if we bailed early. */
return status;
}
#include "../test-skeleton.c"