snippets/C/clone.c

   1 /*
   2  * Linux's clone() system call usage example
   3  */
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <sched.h>
   7 #include <sys/wait.h>
   8 #include <sys/types.h>
   9
  10 #define UNUSED(x) (x = x)
  11 #define STACK_SIZE 16
  12
  13 int child(void *arg)
  14 {
  15         UNUSED(arg);
  16
  17         printf("[child] Hello world!\n");
  18         return 0;
  19 }
  20
  21 int main(void)
  22 {
  23         int tid;
  24         char stack[STACK_SIZE];
  25
  26         tid = clone(child, (void *) stack, 0, NULL);
  27         if (tid < 0) {
  28                 perror("clone()");
  29                 exit(1);
  30         }
  31
  32         wait(NULL);
  33
  34         printf("[parent]: exiting\n");
  35         return 0;
  36 }