jehanne/qa/lib/newlib/211-sigtimedwait.c

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#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
void catcher(int sig) {
printf("Signal catcher called for signal %d\n", sig);
}
void timestamp(char *str) {
time_t t;
time(&t);
printf("The time %s is %s\n", str, ctime(&t));
}
int main(int argc, char *argv[]) {
int result = 0;
int err = 0;
struct sigaction sigact;
sigset_t waitset;
siginfo_t info;
struct timespec timeout;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigact.sa_handler = catcher;
sigaction(SIGALRM, &sigact, NULL);
sigemptyset(&waitset);
sigaddset(&waitset, SIGALRM);
sigprocmask(SIG_BLOCK, &waitset, NULL);
timeout.tv_sec = 1; /* Number of seconds to wait */
timeout.tv_nsec = 1000; /* Number of nanoseconds to wait */
alarm(4);
timestamp("before sigtimedwait()");
result = sigtimedwait(&waitset, &info, &timeout);
err = errno;
timestamp("after sigtimedwait()");
if(result > 0){
printf("sigtimedwait() returned for signal %d\n", info.si_signo);
return 1;
}
printf("sigtimedwait() returned %d; errno = %d\n", result, err);
if(err != EAGAIN){
perror("errno is not EAGAIN");
return 2;
}
return 0;
}