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/* sigset_SIG_HOLD_bug.c [BZ #1951] */
#include <errno.h>
#include <error.h>
#include <inttypes.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#define TEST_SIG SIGINT
/* Print mask of blocked signals for this process */
static void
printSigMask (const char *msg)
{
sigset_t currMask;
int sig;
int cnt;
if (msg != NULL)
printf ("%s", msg);
if (sigprocmask (SIG_BLOCK, NULL, &currMask) == -1)
error (1, errno, "sigaction");
cnt = 0;
for (sig = 1; sig < NSIG; sig++)
{
if (sigismember (&currMask, sig))
{
cnt++;
printf ("\t\t%d (%s)\n", sig, strsignal (sig));
}
}
if (cnt == 0)
printf ("\t\t<empty signal set>\n");
} /* printSigMask */
static void
handler (int sig)
{
printf ("Caught signal %d\n", sig);
printSigMask ("Signal mask in handler\n");
printf ("Handler returning\n");
_exit (1);
} /* handler */
static void
printDisposition (sighandler_t disp)
{
if (disp == SIG_HOLD)
printf ("SIG_HOLD");
else if (disp == SIG_DFL)
printf ("SIG_DFL");
else if (disp == SIG_IGN)
printf ("SIG_IGN");
else
printf ("handled at %" PRIxPTR, (uintptr_t) disp);
} /* printDisposition */
static int
returnTest1 (void)
{
sighandler_t prev;
printf ("===== TEST 1 =====\n");
printf ("Blocking signal with sighold()\n");
if (sighold (TEST_SIG) == -1)
error (1, errno, "sighold");
printSigMask ("Signal mask after sighold()\n");
printf ("About to use sigset() to establish handler\n");
prev = sigset (TEST_SIG, handler);
if (prev == SIG_ERR)
error(1, errno, "sigset");
printf ("Previous disposition: ");
printDisposition (prev);
printf (" (should be SIG_HOLD)\n");
if (prev != SIG_HOLD)
{
printf("TEST FAILED!!!\n");
return 1;
}
return 0;
} /* returnTest1 */
static int
returnTest2 (void)
{
sighandler_t prev;
printf ("\n===== TEST 2 =====\n");
printf ("About to use sigset() to set SIG_HOLD\n");
prev = sigset (TEST_SIG, SIG_HOLD);
if (prev == SIG_ERR)
error (1, errno, "sigset");
printf ("Previous disposition: ");
printDisposition (prev);
printf (" (should be SIG_DFL)\n");
if (prev != SIG_DFL)
{
printf("TEST FAILED!!!\n");
return 1;
}
return 0;
} /* returnTest2 */
static int
returnTest3 (void)
{
sighandler_t prev;
printf ("\n===== TEST 3 =====\n");
printf ("About to use sigset() to set SIG_HOLD\n");
prev = sigset (TEST_SIG, SIG_HOLD);
if (prev == SIG_ERR)
error (1, errno, "sigset");
printf ("About to use sigset() to set SIG_HOLD (again)\n");
prev = sigset (TEST_SIG, SIG_HOLD);
if (prev == SIG_ERR)
error (1, errno, "sigset");
printf ("Previous disposition: ");
printDisposition (prev);
printf (" (should be SIG_HOLD)\n");
if (prev != SIG_HOLD)
{
printf("TEST FAILED!!!\n");
return 1;
}
return 0;
} /* returnTest3 */
int
main (int argc, char *argv[])
{
pid_t childPid;
childPid = fork();
if (childPid == -1)
error (1, errno, "fork");
if (childPid == 0)
exit (returnTest1 ());
int status;
if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid)
error (1, errno, "waitpid");
int result = !WIFEXITED (status) || WEXITSTATUS (status) != 0;
childPid = fork();
if (childPid == -1)
error (1, errno, "fork");
if (childPid == 0)
exit (returnTest2 ());
if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid)
error (1, errno, "waitpid");
result |= !WIFEXITED (status) || WEXITSTATUS (status) != 0;
childPid = fork();
if (childPid == -1)
error (1, errno, "fork");
if (childPid == 0)
exit (returnTest3 ());
if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid)
error (1, errno, "waitpid");
result |= !WIFEXITED (status) || WEXITSTATUS (status) != 0;
return result;
} /* main */
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