/* forktest: do one fork() as the caller; report pid/errno. Used to prove that
 * even root cannot fork once nprocs >= maxproc (system-wide fork DoS). */
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
int main(int argc, char **argv){
    int n = (argc>1)?atoi(argv[1]):1;
    int eagain=0, ok=0, other=0;
    for(int i=0;i<n;i++){
        pid_t p=fork();
        if(p==0)_exit(0);
        if(p>0){ok++; waitpid(p,NULL,0);}
        else if(errno==EAGAIN)eagain++;
        else other++;
        if(eagain>0){ printf("forktest: EAGAIN after %d ok (errno=%d %s)\n",ok,errno,strerror(errno)); fflush(stdout); return 0; }
    }
    printf("forktest: all %d forks succeeded (no EAGAIN)\n", ok); fflush(stdout);
    return 0;
}