Simple zombie (init) process for docker.

simple-init-reaper.c

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

void term(int signum)
{
  printf("TERM: %d\n", getpid());
  exit(0);
}

int main(int argc, char *argv[]) {
  printf("start: %d\n", getpid());
  signal(SIGTERM, term);

  while (1) {
    int status;
    while ( 1 < wait(&status) ) { }
    sleep(1);
  }
}

I have a couple of docker images where I need an init process to reap zombie processes, so I wrote this.

I'm posting it as much to find out if others have better ideas for doing this.

(Should I just be listening for SIGCHLD, rather than polling?)