fifoname.c

来自「给出一个在Linux不同程序间通过命名管道进行通信的实例。」· C语言 代码 · 共 64 行

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#define FIFO_CHANNEL "/tmp/fifo.channel"

int main(int argc,char *argv[])
{

	int fd;
	int pid;
	char r_msg[BUFSIZ];
	char *s_msg="send message to other process";
	if(argc!=2)
	{
		printf("Usage:%s opt(read-2/write-1)\n",argv[0]);
		return 1;
	}
	int a=atoi(argv[1]);
	if(atoi(argv[1])==1){
	
		if(mkfifo(FIFO_CHANNEL,0777)==-1)
		{
		
//			perror("cannot create FIFO channel");

//	return 1;
		}
		fd=open(FIFO_CHANNEL,O_WRONLY);
		if(fd==-1)
		{
			perror("cannot open the FIFO");
			return 1;
		}
		if(write(fd,s_msg,strlen(s_msg))==-1)
		{
			perror("process cannot write data to FIFO");
			return 1;
		}
		else
			printf("send message %s\n",s_msg);
	}
	//receive the message from the FIFO
	if(atoi(argv[1])==2)
	{
	
		fd=open(FIFO_CHANNEL,O_RDONLY);
		if(fd==-1)
		{
			perror("cannot open the FIFO");
			return 1;
		}
		if(read(fd,r_msg,BUFSIZ)==-1)
		{
			perror("process cannot read data from FIFO");
			return 1;
		}
		else
			printf("Receive message from FIFO:%s\n",r_msg);
	}
	return 0;
}