client.c

此源码是著名的教材BeginningLinux Programming中文名字叫Linux程序设计书中的源代码

#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>

# define FIFO_READ	"writefifo"
# define FIFO_WRITE 	"readfifo" 
#define BUF_SIZE	1024

int main(void)
{
	int	wfd, rfd;
    	char	buf[BUF_SIZE];
	int	len;
   
   	umask(0);
   	if(mkfifo (FIFO_WRITE, S_IFIFO|0666))
   	{
		printf ("Can't create FIFO %s because %s", FIFO_WRITE, strerror(errno));
        	exit(1);
	}

   	while ((rfd = open(FIFO_READ, O_RDONLY)) == -1) 
	{
		sleep(1);
	}

	wfd = open(FIFO_WRITE, O_WRONLY);
	if (wfd == -1) 
	{
		printf("Fail to open FIFO %s: %s", FIFO_WRITE, strerror(errno));
        	exit(-1);
	}

	while (1) 
	{
		len = read(rfd, buf, BUF_SIZE);
		if ( len > 0) {
			buf[len] = '\0';
			printf("Server: %s\n", buf);
		}

		printf("Client: ");
        	fgets(buf, BUF_SIZE, stdin);
       	 	buf[strlen(buf) -1] = '\0';
        	if (strncmp(buf,"quit", 4) == 0) {
             		close (wfd);
             		unlink (FIFO_WRITE);
             		close (rfd);
             		exit (0);
		}
        	write (wfd, buf, strlen(buf));
    	}
}