使用socketpair进行父子进程通信

最新推荐文章于 2025-11-07 20:42:35 发布

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本文通过一个简单的C语言程序示例介绍了如何使用socketpair进行进程间通信。父进程作为客户端发送数据，子进程作为服务器接收并处理数据，再回传给父进程。该示例展示了基本的socketpair用法及父子进程间的交互。

代码比较简单

#include <sys/types.h>
#include <sys/socket.h>

#include <stdlib.h>
#include <stdio.h>

int main ()
{
	int fd[2];

	int r = socketpair( AF_UNIX, SOCK_STREAM, 0, fd );
	if ( r < 0 ) {
		perror( "socketpair()" );
		exit( 1 );
	}

	if ( fork() ) {
		/* Parent process: echo client */
		int val = 0;
		close( fd[1] );
		
		while ( 1 ) {
			sleep( 1 );
			++val;
			printf( "Sending data: %d\n", val );
			write( fd[0], &val, sizeof(val) );
			read( fd[0], &val, sizeof(val) );
			printf( "Data received: %d\n", val );
		}
	}
	else {
		/* Child process: echo server */
		int val;
		close( fd[0] );
		while ( 1 ) {
			read( fd[1], &val, sizeof(val) );
			++val;
			write( fd[1], &val, sizeof(val) );
		}
	}
}

测试结果：

$ make test
cc test.c -o test
$ ./test
Sending data: 1
Data received: 2
Sending data: 3
Data received: 4
Sending data: 5
Data received: 6
Sending data: 7
Data received: 8
Sending data: 9
Data received: 10
Sending data: 11
Data received: 12
Sending data: 13
Data received: 14