prg4_8client.c

配套光盘网络编程进程间的通信,网络编程进程间的通信是一本很经典的好书

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include "fifo.h"
#include <readline/readline.h>
#include <readline/history.h>
#include <fcntl.h>

#define	MAXLINE	100
#define 	FILE_MODE	(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)

int main(int argc,char **argv)
{
	int readfifo,writefifo;
	size_t len;
	size_t n;
	char *ptr,buff[MAXLINE],fifoname[MAXLINE];
	char 	serr[256] = {0};
	pid_t	pid;
	
	pid = getpid();
	snprintf(fifoname,sizeof(fifoname),"/tmp/fifo.%ld",(long)pid);
	if ((mkfifo(fifoname,FILE_MODE) <0) && (errno != EEXIST))
	{
		sprintf(serr,"can't create %s",SERV_FIFO);
		perror(serr);
		exit(0);			
	}
	
	snprintf(buff,sizeof(buff),"%ld",(long)pid);
	len = strlen(buff);
	ptr = buff + len;
	
	fgets(ptr,MAXLINE-len,stdin);
	len = strlen(buff);
	writefifo = open(SERV_FIFO,O_WRONLY,0);
	write(writefifo,buff,len);
	readfifo = open(fifoname,O_RDONLY,0);	//never used
	while( (n = read(readfifo,buff,))>0)
	{
		write(STDOUT_FILENO,buff,n);
	}
	
	close(readfifo);
	unlink(fifoname);
	exit(0);
	
}