// FreeBSD hands
// NetBSD hangs
// OpenBSD no support for sigwaitinfo(2)
// Linux passes over
// SmartOS passes over
// DragonflyBSD hangs

#include <sys/param.h>
#include <sys/types.h>

#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>

int
main(int argc, char **argv)
{
        int ret;
        sigset_t set;
        siginfo_t siginfo;
        pid_t child;

        sigemptyset(&set);
        sigaddset(&set, SIGIO);
        sigaddset(&set, SIGCHLD);

        child = fork();
        if (child == -1)
                errx(EXIT_FAILURE, "fork");
        if (child == 0) {
                _exit(0);
        }

        ret = sigwaitinfo(&set, &siginfo);

        printf("ret=%d\n", ret);

        return 0;
}