SOCKET_PRGM--无线程版本

/* File Name: client.c */

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<unistd.h>
#define MAXLINE 4096
#define server_port 65535

void  fun()
{
        int i;
        printf("The Client is connecting to Server. Please wait:");
        for(i=0;i<=100;++i)
        {

                usleep(125555);
                printf("%3d%%\b\b\b\b\b ",i);
                fflush(stdout);

        }

        printf("\nConnect to Server successfully.\n");
}

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

    if( argc != 2){
    printf("usage: ./client <Server's ipv4 address>\n");
    exit(0);
    }

    fun();
    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(server_port);
    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);
    }
    if((rec_len = recv(sockfd, buf, MAXLINE,0)) == -1) {
       perror("recv error");
       exit(1);
    }
    buf[rec_len]  = '\0';
    printf("**NOTE** : %s \n\n",buf);
    close(sockfd);
    exit(0);
}

/* File Name: server.c */
#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 DEFAULT_PORT 65535
#define MAXLINE 4096
int main(int argc, char** argv)
{
    int    socket_fd, connect_fd;
    struct sockaddr_in     servaddr;
    char    buff[4096];
    int     n;

    if( (socket_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){
    printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }
    //初始化Socket
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(DEFAULT_PORT);

    //将本地地址绑定到所创建的套接字上
    if( bind(socket_fd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1){
    printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }
    //开始监听是否有客户端连接
    if( listen(socket_fd, 10) == -1){
    printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno);
    exit(0);
    }

    printf("======waiting for client's request======\n");
    while(1)
    {

    //阻塞，直到有客户端连接。
        if( (connect_fd = accept(socket_fd, (struct sockaddr*)NULL, NULL)) == -1)
    {
             printf("accept socket error: %s(errno: %d)",strerror(errno),errno);
                 continue;
    }
        //接受客户端传过来的数据
        n = recv(connect_fd, buff, MAXLINE, 0);

        //子进程
        if(!fork())
        {
                //向客户端发送回应数据
                 if(send(connect_fd, "Message was sent successfully!\n", 31,0) == -1)
                    perror("send error");
                     close(connect_fd);
                 exit(0);
        }
        buff[n] = '\0';
        printf("**recv msg from client**: \n%s\n", buff);
        close(connect_fd);
    }
    close(socket_fd);
}

备份地址: 【SOCKET_PRGM--无线程版本】