simple-init.c

#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    (void)argc;
    switch(fork()) {
        case 0:
            execvp(argv[1], &argv[1]);
            err(1, "Failed to execve(%s)", argv[1]);
        case -1:
            err(1, "Failed to fork()");
        default:
            break;
    }

    /* TODO: If we get a SIGTERM, we should try and clean up our children.
     * By sending SIGTERM, SIGKILL etc
     */

    /* Wait for all children to exit */
    while (wait(NULL) == -1 && errno != ECHILD)
        ;

    return 0;
}