#include "apue.h"

int

main(void)

{

pid_t pid;

if ((pid = fork()) < 0)

err_sys("fork error");

else if (pid != 0) { /* parent */

sleep(2);

exit(2); /* terminate with exit status 2 */

}

if ((pid = fork()) < 0)

err_sys("fork error");

else if (pid != 0) { /* first child */

sleep(4);

abort(); /* terminate with core dump */

}

if ((pid = fork()) < 0)

err_sys("fork error");

else if (pid != 0) { /* second child */

execl("/bin/dd", "dd", "if=/etc/passwd", "of=/dev/null", NULL);

exit(7); /* shouldn't get here */

}

if ((pid = fork()) < 0)

err_sys("fork error");

else if (pid != 0) { /* third child */

sleep(8);

exit(0); /* normal exit */

}

sleep(6); /* fourth child */

kill(getpid(), SIGKILL); /* terminate w/signal, no core dump */

exit(6); /* shouldn't get here */

}