none/tests/fork.c

   1
   2 #include <unistd.h>
   3 #include <sys/types.h>
   4 #include <sys/wait.h>
   5 #include <stdio.h>
   6
   7 int main(void)
   8 {
   9   pid_t pid;
  10
  11   pid = fork ();
  12
  13   /* Sometimes child goes first (non-zero), sometimes parent (zero).  This
  14      printing means we can detect if we correctly get a zero result and a
  15      non-zero result (--> three 'X's printed), but the output doesn't depend
  16      on the order. */
  17
  18   printf("%s", pid==0 ? "X" : "XX");
  19
  20   if (pid != 0)
  21      waitpid(pid, NULL, 0);
  22
  23   return 0;
  24 }