ipc/fork.c

   1 /* compile with:
   2    gcc fork.c -o fork -Wall -W -Wextra -ansi -pedantic */
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7
   8 int main(void)
   9 {
  10     pid_t pid;
  11
  12     if ((pid = fork()) < 0) {  /* fork error */
  13         perror("fork");
  14         exit(EXIT_FAILURE);
  15     }
  16
  17     else if (pid > 0)          /* parent process */
  18         printf("Parent's pid: %d\n", getpid());
  19
  20     else                       /* child process (pid = 0) */
  21         printf("Child's pid: %d\n", getpid());
  22
  23     /* whatever goes here, will be executed from the
  24        parent AND the child process as well
  25      */
  26    return EXIT_SUCCESS;
  27 }