p6-2.c

UNIX程序设计教程

#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include "err_exit.h"
int global = 5;
int main(void)
{
    pid_t pid;
    char *string = "I am father. ";
    int local = 10;
    printf(" before fork\n");
    if ((pid=vfork())<0) 
            err_exit("fork");
    if (pid==0) {       /* 子进程 */
        string = "I am child.";
        global ++;
        exit(EXIT_SUCCESS);
    } 
     /* 父进程 */
    local++;    
    printf(" %s My pid is %d.\n"
    " global=%d local=%d child's pid=%d\n",
    string, getpid(), global, local, pid );
    exit(EXIT_SUCCESS);
}