/*************************************************************************\
*                  Copyright (C) Michael Kerrisk, 2026.                   *
*                                                                         *
* This program is free software. You may use, modify, and redistribute it *
* under the terms of the GNU General Public License as published by the   *
* Free Software Foundation, either version 3 or (at your option) any      *
* later version. This program is distributed without any warranty.  See   *
* the file COPYING.gpl-v3 for details.                                    *
\*************************************************************************/

/* fork_bomb_simple.c

   A simple fork-bomb program that can be useful when experimenting with
   the cgroups 'pids' controller.

   The program creates as many children as possible. Each child sleeps for
   60 seconds, as does the parent when it can create no more children.
*/
#include <sys/wait.h>
#include "tlpi_hdr.h"

int
main(int argc, char *argv[])
{
    printf("Parent PID = %ld\n", (long) getpid());

    for (int j = 1; ; j++) {
        pid_t childPid = fork();

        if (childPid == 0)      /* Child falls out of loop */
            break;

        if (childPid == -1) {   /* Could not create another child? */
            errMsg("fork");
            break;              /* If so, parent falls out of loop */
        }

        printf("Child %d: PID = %ld\n", j, (long) childPid);
    }

    /* Parent and all children fall through to here */

    sleep(60);
    exit(EXIT_SUCCESS);
}