ipc/fork.c

   1 /*
   2  * Compile with:
   3  * gcc fork.c -o fork -Wall -W -Wextra -ansi -pedantic
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 int main(void)
  11 {
  12     pid_t pid;
  13
  14     if ((pid = fork()) < 0) {  /* fork error */
  15         perror("fork()");
  16         exit(EXIT_FAILURE);
  17     }
  18
  19     else if (pid > 0)          /* parent process */
  20         printf("Parent's pid: %d\n", getpid());
  21
  22     else                       /* child process (pid = 0) */
  23         printf("Child's pid: %d\n", getpid());
  24
  25     /*
  26      * Whatever goes here, will be executed from the
  27      * parent AND the child process as well.
  28      */
  29
  30     return EXIT_SUCCESS;
  31 }