p11-1.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 30 行

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include "err_exit.h"
int main (void)
{
    pid_t pid;
    int n, mypipe[2];
    char buffer[BUFSIZ+1];
    char some_data[] =  "Hello, world!";
    /* 创建管道 */
    if (pipe (mypipe)) 
        err_exit("Pipe failed.\n");
    /* 派生子进程 */ 
    pid = fork ();  
    if (pid < (pid_t) 0)   
        err_exit ("Fork failed.\n");   /* fork 失败 */
    else if (pid == (pid_t) 0) {       /* 这是子进程 */
        close(mypipe[1]);
        n = read(mypipe[0],buffer,BUFSIZ);
        printf("child %d: read %d bytes: %s\n",getpid(),n,buffer);
    }
    else {   /* 这是父进程 */
        close(mypipe[0]);
        n = write(mypipe[1], some_data, strlen(some_data));
        printf("parent %d: write %d bytes\n", getpid(),n);
    }
    exit (EXIT_SUCCESS);
}