server.c

TCP/IP服务器程序简略实现

#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <error.h>
#include <unistd.h>
#include<unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>

#define SERVERPORT 3333
#define BACKLOG 10
#define MAXSIZE 8192

int main(void)
{
    int flags;
    int fd, writesize;
    struct sockaddr_in server_sockaddr;
    struct sockaddr_in client_sockaddr;
    int addrlen;
    addrlen = sizeof(struct sockaddr);
    int sockfd, bindfd, listenfd, clientfd, recvbytes;
    char buf[MAXSIZE];
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd == -1) {
	printf("Create a socket error!!!\n");
	exit(1);
    }
    else
	printf("sockfd success!!! sockfd = %d\n",sockfd);
    server_sockaddr.sin_family = AF_INET;
    server_sockaddr.sin_port = htons(SERVERPORT);
    server_sockaddr.sin_addr.s_addr = INADDR_ANY;
    memset(server_sockaddr.sin_zero, 0, sizeof(server_sockaddr.sin_zero));
    bindfd = bind(sockfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr));
    if(bindfd == -1) {
	printf("bind error!!!\n");
	exit(1);
    }
    else
	printf("bind success!!!\n");	
    listenfd = listen(sockfd, BACKLOG);
    if(listenfd == -1) {
	printf("listen error!!!\n");
	exit(1);
    }
    else
	printf("listening-----\n");
    /*
    if((flags=fcntl( sockfd, F_SETFL, 0))<0)
	perror("fcntl F_SETFL");
    flags |= O_NONBLOCK;
    if(fcntl( sockfd, F_SETFL,flags)<0)
	perror("fcntl");
     */
    clientfd = accept(sockfd, (struct sockaddr *)&client_sockaddr, &addrlen);
    if(clientfd == -1) {
	printf("accept error!!!\n");
	exit(1);
    }
    else
	printf("accept success!!!\n");
    fd = open("/home/hongzhi/UNIX/linux_code/10/list", \
	    O_WRONLY | O_CREAT | O_TRUNC | O_APPEND); 
    do {
	recvbytes = recv(clientfd, buf, sizeof(buf), 0);
	if(recvbytes == -1) {
	    printf("recv error!!!\n");
	    exit(1);
	}
	else 
	    if(recvbytes > 0) {
		printf("recv success!!! %d\n",recvbytes);
		printf("receive : %s\n",buf);
		writesize = write(fd, buf, recvbytes);
	    }
	    else
		printf("END!!!\n");
    } while(recvbytes > 0);
    close(sockfd);
    close(fd);
    return 0;
}