ipc/fork_mult.c

   1 /*
   2  * Compile with:
   3  * gcc fork_mult.c -o fork_mult -Wall -W -Wextra -ansi -pedantic
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <sys/wait.h>
  10
  11 #define NUM_CHILDS 5
  12
  13 int main(void)
  14 {
  15     pid_t pid[NUM_CHILDS];
  16     int i, retval;
  17
  18     for (i = 0; i < NUM_CHILDS; i++) {
  19         if ((pid[i] = fork()) < 0) {    /* fork error */
  20             perror("fork()");
  21             exit(EXIT_FAILURE);
  22         }
  23
  24         else if (pid[i] > 0) {          /* parent process */
  25             wait(&retval);
  26         }
  27
  28         else {                          /* child process (pid = 0) */
  29             printf("Child[%d] = %d\n", i, getpid());
  30
  31             /* Break, or else every child will spawn its own children */
  32             break;
  33         }
  34     }
  35
  36    return EXIT_SUCCESS;
  37 }