p11-3.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 32 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];
    /* 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 */
        sprintf(buffer, "%d",mypipe[0]);    /* 转换描述字为字符 */
        execl("p11-4", "p11-4", buffer, (char *)0);  
        exit (EXIT_SUCCESS);
    }
    else {   /* 这是父进程 */
        close(mypipe[0]);
        n = write(mypipe[1], "Hello world!\n", strlen("Hello world!\n"));
        printf("%d: write %d bytes\n", getpid(),n);
        n = write(mypipe[1], "Greeting from father", 
                                        strlen("Greeting from father"));
        printf("%d: write %d bytes\n", getpid(),n);
        exit(EXIT_SUCCESS);
    }
}