p1.c

#include "apue.h"

int globvar = 6;

int main() {
  int var;
  pid_t pid;

  var = 88;
  printf("before vfork\n");
  if ((pid = vfork()) < 0) {
    err_sys("vfork error");
  } else if (pid == 0) {
    globvar++;
    var++;
    exit(0);
  }
  printf("pid = %ld, glob = %d, car = %d\n", (long)getpid(), globvar, var);
  exit(0);
}