Linux无名管道pipe的使用(父子进程)

淩亂°似流年 2021-12-16 07:55 262阅读 0赞

**我们来看一下pipe()函数的使用.**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70][]

**我构思了一个简单的父子进程通信函数，以帮助大家初步学习对无名管道pipe的操作 ,程序源代码如下.**

**\#include<stdio.h>**

**\#include<unistd.h>**

**\#include<string.h>**

**void process\_communication()**

**\{**

**int fd\[2\];**

**int t1;**

**char string\[\] = "Hello my pipe!";**

**char buf\_Read\[60\];**

**int nbytes;**

**int n;**

**int p = pipe(fd);**

**t1 = fork();**

**if(t1 > 0)//father**

**\{**

**//read**

**waitpid(t1, NULL, 0);//等待其子进程结束后再往下执行, 确保无名管道内已经写入内容(子进程负责写)**

**nbytes = read(fd\[0\], buf\_Read, sizeof(string));**

**if(nbytes > 0)**

**\{**

**puts("Reading is successful.\\n");**

**printf("%d\\n",nbytes);**

**\}**

**else**

**puts("reading error.\\n");**

**\}**

**else if(t1 == 0)//son**

**\{**

**//write**

**n = write(fd\[1\], string, sizeof(string));**

**if(n > 0)**

**puts("Writing is suceessful.\\n");**

**else**

**puts("writing error.\\n");**

**\}**

**else**

**\{**

**puts("failure to generate a son process.\\n");**

**\}**

**return ;**

**\}**

**int main()**

**\{**

**process\_communication();**

**return 0;**

**\}**

运行结果:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 1][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjA0ODQ2Mw_size_16_color_FFFFFF_t_70 1]: /images/20211214/8348e2bb7cfa41328289b6832c7eb196.png