一道Socket的例子

 

//服务端代码：

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>

#define MAXLINE 4096

int main(int argc, char** argv)
{
    int    listenfd, connfd;
    struct sockaddr_in     servaddr;
    char    buff[4096];
    int     n;

    if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){
    printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }

    memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(6666);

    if( bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1){
    printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }

    if( listen(listenfd, 10) == -1){
    printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }

    printf("======waiting for client's request======\n");
    while(1){
    if( (connfd = accept(listenfd, (struct sockaddr*)NULL, NULL)) == -1){
        printf("accept socket error: %s(errno: %d)",strerror(errno),errno);
        continue;
    }
    n = recv(connfd, buff, MAXLINE, 0);
    buff[n] = '\0';
    printf("recv msg from client: %s\n", buff);
    close(connfd);
    }

    close(listenfd);
}

//客户端代码：

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>

#define MAXLINE 4096

int main(int argc, char** argv)
{
    int sockfd, n;
    char    recvline[4096], sendline[4096];
    struct sockaddr_in    servaddr;

    if( argc != 2){
    printf("usage: ./client <ipaddress>\n");
    exit(0);
    }

    if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
    printf("create socket error: %s(errno: %d)\n", strerror(errno),errno);
    exit(0);
    }

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(6666);
    if( inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){
    printf("inet_pton error for %s\n",argv[1]);
    exit(0);
    }

    if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0){
    printf("connect error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }

    printf("send msg to server: \n");
    fgets(sendline, 4096, stdin);
    if( send(sockfd, sendline, strlen(sendline), 0) < 0)
    {
    printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);
    exit(0);
    }

    close(sockfd);
    exit(0);
}


作者：吴秦
出处：http://www.cnblogs.com/skynet/