#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>

int main(int argc, const char* argv[])
{
    const int chunk = 100000000;
    int status;
    int err;
    pid_t pid;

    pid = fork();
    for (;;) {
        switch (pid) {
        case -1: /* Fork failed */
            exit(EXIT_FAILURE);
            break;

        case 0: /* Child */
            printf("Try to eat up memory");
            for (;;) {
                char* m = malloc(chunk);
                for (char* p = m; p < m + chunk; p++)
                    *p = 0xff;
                printf(".");
                fflush(stdout);
            }
            return 0;
            break;

        default: /* Parent */
            err = wait(&status);
            if (err == -1) {
                printf("wait failed with errno = %d\n", errno);
                exit(0);
            } else {
                if (WIFEXITED(status)) {
                    printf("Child exited successfully.  Exit parent too.\n");
                    exit(EXIT_SUCCESS);
                } else {
                    printf("Child exited abnormally.  Wait for 5 seconds....\n");
                    sleep(5);
                    printf("Restarting child again.\n");
                    pid = fork();
                }
            }
            break;
        }
    }
}