Linux下无名管道一般仅用于父子进程间的通信；

测试代码如下

//file name: fifo_test.c

#include <sys/prctl.h>

#include "fifo_test.h"

int

main(int argc, char **argv)

{

	int ret = 0;

	char buf[32] = {'\0'};

	int pipe_fd[2]; //0---read 1--write

	pid_t pid;

	if(pipe(pipe_fd)<0)

	{

		printf("pipe create error/n");

		return -1;

	}

	if((pid=fork())==0)  //子进程

	{

		close(pipe_fd[0]);

		prctl(PR_SET_NAME, "child");

		while(1)

		{

			strcpy(buf, "hi, from child process!");

			ret=write(pipe_fd[1],buf,sizeof(buf));

			sleep(3);//

		}

	}

	close(pipe_fd[1]);

	while(1)

	{

		ret=read(pipe_fd[0],buf,sizeof(buf));

		printf("father process, recv msg: %s\n",buf);

	}	

	return 0;

}

编译

gcc -c fifo_test.c -o fifo_test.o -Wall -g

gcc fifo_test.o  -o fifo_test -Wall -g

执行结果

./fifo_test

father process, recv msg: hi, from child process!, len: 32

father process, recv msg: hi, from child process!, len: 32

father process, recv msg: hi, from child process!, len: 32