prg8_7.c

内有１６个例子详细描述ＵＮＩＸ网络编程的各种技术

// File: prg8_7.c
	#include <ctype.h>
	#include <ctype.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <fcntl.h>
	#include <limits.h>
	#include <sys/types.h>
	#include <sys/stat.h>

	#define SERVER_FIFO_NAME "./serv_fifo"
	#define CLIENT_FIFO_NAME "./cli_%d_fifo"

	#define BUFFER_SIZE 20

	struct data_to_pass_st {
	   pid_t  client_pid;
	   char   some_data[BUFFER_SIZE - 1];
	   };

	int main()
	{
	int server_fifo_fd, client_fifo_fd;
	struct data_to_pass_st my_data;
	int times_to_send;
	char client_fifo[256];

	server_fifo_fd = open(SERVER_FIFO_NAME, O_WRONLY);
	if (server_fifo_fd == -1) {
	   fprintf(stderr, "Sorry, no server\n");
	   exit(EXIT_FAILURE);
	   }

	my_data.client_pid = getpid();
	sprintf(client_fifo, CLIENT_FIFO_NAME, my_data.client_pid);
	if (mkfifo(client_fifo, 0777) == -1) {
	   fprintf(stderr, "Sorry, can't make %s\n", client_fifo);
	   exit(EXIT_FAILURE);
	   }

	for (times_to_send = 0; times_to_send < 5; times_to_send++) {
	   sprintf(my_data.some_data, "Hello from %d", my_data.client_pid); 
	   printf("%d sent %s, ", my_data.client_pid, my_data.some_data);
	   write(server_fifo_fd, &my_data, sizeof(my_data));
	   client_fifo_fd = open(client_fifo, O_RDONLY);
	   if (client_fifo_fd != -1) {
	      if (read(client_fifo_fd, &my_data, sizeof(my_data)) > 0) {
	         printf("received: %s\n", my_data.some_data);
	         }
	      close(client_fifo_fd);
	      }
	   }
	close(server_fifo_fd);
	unlink(client_fifo);
	exit(EXIT_SUCCESS);
	}