Fork children processes & wait for them to finish

process.c

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

#include <unistd.h>
#include <sys/wait.h>

int main() {
  const int n_processes = 5;
  pid_t pid;    

  // spawn n processes
  for (size_t i = 0; i < n_processes; ++i) {
    pid = fork();
    if (pid == 0) { // in child
      printf("Spawning process %d\n", getpid());
      exit(EXIT_SUCCESS);
    }
    else if (pid > 0) { // in parent
      printf("From parent: created child pid %d\n", pid);
    }
  }

  // parent waits for each child process to terminate
  // otherwise, exiting children become zombie processes (& won't notify their parent of their exit)
  while ((pid = wait(NULL)) != -1) {
    printf("Terminating process %d\n", pid);
  }

  return 0;
}