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#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <stdio.h>

#include <sys/signal.h>

#include <sys/wait.h>

#include <unistd.h>

void test_handler(int signo)

{

    write(1, "caught SIGCHLD\n", 15);

    return;

}

int main(void)

{

    pid_t mypid;

    struct sigaction siga;

    static sigset_t sigset;

    /* Set up sighandling */

    sigfillset(&sigset);

    siga.sa_handler = test_handler;

    siga.sa_mask = sigset;

    siga.sa_flags = 0;

    if (sigaction(SIGCHLD, &siga, (struct sigaction *)NULL) != 0) {

        fprintf(stderr, "sigaction choked: %s!", strerror(errno));

        exit(EXIT_FAILURE);

    }

    /* Setup a child process to exercise the sig handling for us */

    mypid = getpid();

    if (fork() == 0) {

        int i;

        for (i=0; i < 3; i++) {

            sleep(2);

            kill(mypid, SIGCHLD);

        }

        _exit(EXIT_SUCCESS);

    }

    /* Wait for signals */

    write(1, "waiting for a SIGCHLD\n",22);

    for(;;) {

        sleep(10);

        if (waitpid(-1, NULL, WNOHANG | WUNTRACED) > 0)

            break;

        write(1, "after sleep\n", 12);

    }

    printf("Bye-bye!  All done!\n");

    return 0;

}