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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/select.h>
// our SIGALRM handler
void handler(int signum) {
(void)signum;
puts("got signal\n");
}
static int
do_test (void)
{
int rc;
sigset_t wait_mask, mask_sigchld;
struct sigaction act;
// block SIGALRM. We want to handle it only when we're ready
sigemptyset(&mask_sigchld);
sigaddset(&mask_sigchld, SIGALRM);
sigprocmask(SIG_BLOCK, &mask_sigchld, &wait_mask);
sigdelset(&wait_mask, SIGALRM);
// register a signal handler so we can see when the signal arrives
memset(&act, 0, sizeof(act));
sigemptyset(&act.sa_mask); // just in case an empty set isn't all 0's (total paranoia)
act.sa_handler = handler;
sigaction(SIGALRM, &act, NULL);
// send ourselves a SIGARLM. It will pend until we unblock that signal in pselect()
printf("sending ourselves a signal\n");
kill(getpid(), SIGALRM);
printf("signal is pending; calling pselect()\n");
rc = pselect(0, NULL, NULL, NULL, NULL, &wait_mask);
if (rc != -1 || errno != EINTR) {
int e = errno;
printf("pselect() returned %d, errno %d (%s)\n", rc, e, strerror(e));
exit(1);
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
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