root/user/uw-testbin/onefork/onefork.c

DEFINITIONS

1. main

   1 /*
   2  * onefork - simple test of fork
   3  *
   4  *  relies only on fork, console write, and _exit
   5  *
   6  *  parent prints "P", child prints "C", both exit
   7  *
   8  */
  10 #include <unistd.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <err.h>
  16 int
main(int argc, char *argv[])
  18 {
  19   (void)argc;
  20   (void)argv;
pid_t pid;
pid = fork();
  23   if (pid < 0) {
warn("fork");
  25   }
  26   else if (pid == 0) {
  27     /* child */
putchar('C');
putchar('\n');
  30   }
  31   else {
  32     /* parent */
putchar('P');
putchar('\n');
  35   }
  36   return(0);
  37 }