14-9.c

《linux应用开发技术详解》的配套代码

#include <stdio.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include  <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>

#define MAXDATASIZE 256
#define SERVPORT 3333 
#define BACKLOG 1
#define STDIN 0

int main(void)
{
	int sockfd,client_fd;
	int sin_size;
	struct sockaddr_in my_addr, remote_addr;
	char buf[256];
	char send_str[256];
	int recvbytes;
	fd_set rfd_set, wfd_set, efd_set;
	struct timeval timeout;
	int ret;

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		exit(1);
	}
	
	bzero(&my_addr, sizeof(struct sockaddr_in));
	my_addr.sin_family=AF_INET;
	my_addr.sin_port=htons(SERVPORT);
	inet_aton("127.0.0.1", &my_addr.sin_addr);

	if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
		perror("bind");
		exit(1);
	}
	if (listen(sockfd, BACKLOG) == -1) {
		perror("listen");
		exit(1);
	}

	sin_size = sizeof(struct sockaddr_in);
	if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) {
		perror("accept");
		exit(1);
	}
	fcntl(client_fd, F_SETFD, O_NONBLOCK);
	
	while (1) {
		FD_ZERO(&rfd_set);
		FD_ZERO(&wfd_set);
		FD_ZERO(&efd_set);
		FD_SET(STDIN, &rfd_set);
		FD_SET(client_fd, &rfd_set);
		FD_SET(client_fd, &wfd_set);
		FD_SET(client_fd, &efd_set);
		timeout.tv_sec = 10;
		timeout.tv_usec = 0;

		ret = select(client_fd + 1, &rfd_set, &wfd_set, &efd_set, &timeout);
		if (ret == 0) {
			continue;
		}
		
		if (ret < 0) {
			perror("select error: ");
			exit(-1);
		}

		if (FD_ISSET(STDIN, &rfd_set)) {
			fgets(send_str, 256, stdin);
			send_str[strlen(send_str)-1] = '\0';
			if (strncmp("quit", send_str, 4) == 0) {
				close(client_fd);
				close(sockfd);
				exit(0);
			}
			send(client_fd, send_str, strlen(send_str), 0);
		}
		if (FD_ISSET(client_fd, &rfd_set)) {
			recvbytes=recv(client_fd, buf, MAXDATASIZE, 0);
			if (recvbytes == 0) {
				close(client_fd);
				close(sockfd);
				exit(0);
			}
			buf[recvbytes] = '\0';
			printf("Lucy: %s\n", buf);
			printf("Peter: ");
			fflush(stdout);
		}
		if (FD_ISSET(client_fd, &efd_set)) {
			close(client_fd);
			exit(0);
		}
	}
}