/*      $OpenBSD: siginterrupt.c,v 1.1 2011/09/13 23:50:17 fgsch Exp $  */
/*
 * Federico G. Schwindt <fgsch@openbsd.org>, 2011. Public Domain.
 */
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
#include "test.h"

volatile sig_atomic_t hits = 0;

void
handler(int sig)
{
        hits++;
}

void *
blocker(void *arg)
{
        int fds[2];
        char buf;

        CHECKe(pipe(fds));
        ASSERT(read(fds[0], &buf, 1) == -1);
        return ((caddr_t)NULL + errno);
}

int
main(int argc, char **argv)
{
        pthread_t tid;
        void *retval;

        ASSERT(signal(SIGUSR1, handler) != SIG_ERR);

        CHECKr(pthread_create(&tid, NULL, blocker, NULL));
        sleep(1);

        /* With signal(3) system calls will be restarted. */
        CHECKr(pthread_kill(tid, SIGUSR1));
        sleep(1);

        /* Same as default with signal(3). */
        CHECKe(siginterrupt(SIGUSR1, 0));
        CHECKr(pthread_kill(tid, SIGUSR1));
        sleep(1);

        /* Should interrupt the call now. */
        CHECKe(siginterrupt(SIGUSR1, 1));
        CHECKr(pthread_kill(tid, SIGUSR1));
        sleep(1);

        CHECKr(pthread_join(tid, &retval));
        ASSERT(retval == (void *)EINTR);
        ASSERT(hits == 3);
        SUCCEED;
}