/*
 * Copyright (c) 2015  Philip Guenther <guenther@openbsd.org>
 *
 * Public domain.
 *
 * Verify that SIGTHR can't be blocked or caught by applications.
 */

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>

void sighandler(int sig) { }

int
main(void)
{
        struct sigaction sa;
        sigset_t set, oset;

        /*
         * check sigprocmask
         */
        if (sigprocmask(SIG_BLOCK, NULL, &set))
                err(1, "sigprocmask");
        if (sigismember(&set, SIGTHR))
                errx(1, "SIGTHR already blocked");
        sigaddset(&set, SIGTHR);
        if (sigprocmask(SIG_BLOCK, &set, NULL))
                err(1, "sigprocmask");
        if (sigprocmask(SIG_SETMASK, &set, &oset))
                err(1, "sigprocmask");
        if (sigismember(&oset, SIGTHR))
                errx(1, "SIGTHR blocked with SIG_BLOCK");
        if (sigprocmask(SIG_BLOCK, NULL, &oset))
                err(1, "sigprocmask");
        if (sigismember(&oset, SIGTHR))
                errx(1, "SIGTHR blocked with SIG_SETMASK");

        /*
         * check sigaction
         */
        if (sigaction(SIGTHR, NULL, &sa) == 0)
                errx(1, "sigaction(SIGTHR) succeeded");
        else if (errno != EINVAL)
                err(1, "sigaction(SIGTHR) didn't fail with EINVAL");
        memset(&sa, 0, sizeof sa);
        sa.sa_handler = sighandler;
        sigfillset(&sa.sa_mask);
        sa.sa_flags = 0;
        if (sigaction(SIGTHR, &sa, NULL) == 0)
                errx(1, "sigaction(SIGTHR) succeeded");
        else if (errno != EINVAL)
                err(1, "sigaction(SIGTHR) didn't fail with EINVAL");
        if (sigaction(SIGUSR1, &sa, NULL))
                err(1, "sigaction(SIGUSR1)");
        if (sigaction(SIGUSR1, NULL, &sa))
                err(1, "sigaction(SIGUSR1)");
        if (sigismember(&sa.sa_mask, SIGTHR))
                errx(1, "SIGTHR blocked with sigaction");

        return 0;
}