#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
  if (argc != 3) {
    fprintf(stderr, "usage: nowait <DELAY-MILLISECONDS> <CHILD-NEWLINE>\n");
    exit(1);
  }

  unsigned int delay_ms = atoi(argv[1]);
  int child_newline = atoi(argv[2]);

  struct timespec delay;
  delay.tv_sec = delay_ms / 1000;
  delay.tv_nsec = (delay_ms % 1000) * 1000000;

  printf("msg from parent process\n");
  fflush(stdout);

  switch(fork()) {
    case -1:
      perror("fork");
      return 1;
    case 0:
      if (delay_ms > 0)
        nanosleep(&delay, NULL);
      if (child_newline)
        printf("msg from child process\n");
      else
        printf("msg from child process");
      fflush(stdout);
      return 0;
  }

  return 0;
}