client_thread.c server_thread.c

client_thread.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <unistd.h>

int main(int argc,char *argv[])
{
    int connect_fd;
    int ret;
    char snd_buf[1024];
    int i;
    int port;
    int len;

    static struct sockaddr_in srv_addr;

    //客户端运行需要给出具体的连接地址和端口
    if(argc!=3)
    {
        printf("Usage: %s server_ip_address port\n",argv[0]);
        return 1;
    }

    //获得输入的端口
    port=atoi(argv[2]);

    //创建套节字用于客户端的连接
    connect_fd=socket(PF_INET,SOCK_STREAM,0);
    if(connect_fd<0)
    {
        perror("cannot create communication socket");
        return 1;
    }

    //填充关于服务器的套节字信息
    memset(&srv_addr,0,sizeof(srv_addr));
    srv_addr.sin_family=AF_INET;
    srv_addr.sin_addr.s_addr=inet_addr(argv[1]);
    srv_addr.sin_port=htons(port);

    //连接指定的服务器
    ret=connect(connect_fd,(struct sockaddr *)&srv_addr,sizeof(srv_addr));
    if(ret==-1)
    {
        perror("cannot connect to the server");
        close(connect_fd);
        return 1;
    }

    memset(snd_buf,0,1024);
    //用户输入信息后，程序将输入的信息通过套接字发送给服务器
    //然后调用read函数从服务器中读取发送来的信息
    //当输入“@”时，程序退出
    while(1)
    {
        write(STDOUT_FILENO,"input message:",14);
        len=read(STDIN_FILENO,snd_buf,1024);
        if(len>0)
            write(connect_fd,snd_buf,len);
        len=read(connect_fd,snd_buf,len);
        if(len>0)
            printf("Message form server: %s\n",snd_buf);
        if(snd_buf[0]==‘@‘)
            break;
    }
    close(connect_fd);
    return 0;
}

server_thread.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <netdb.h>
#include <pthread.h>

//线程执行函数负责读写
void *thr_fn(void *arg)
{
    int size,j;
    char recv_buf[1024];
    int *parg=(int *)arg;
    int new_fd=*parg;
    printf("new_fd=%d\n",new_fd);
    while((size=read(new_fd,recv_buf,1024))>0)
    {
        if(recv_buf[0]==‘@‘)
            break;
        printf("Message from client(%d): %s\n",size,recv_buf);
        for(j=0;j<size;j++)
            recv_buf[j]=toupper(recv_buf[j]);
        write(new_fd,recv_buf,size);
    }
    close(new_fd);
    return 0;
}

int main(int argc,char *argv[])
{
    socklen_t clt_addr_len;
    int listen_fd;
    int com_fd;
    int ret;
    int i;
    static char recv_buf[1024];
    int len;
    int port;
    pthread_t tid;

    struct sockaddr_in clt_addr;
    struct sockaddr_in srv_addr;

    //服务器端运行时要给出端口信息，该端口为监听端口
    if(argc!=2)
    {
        printf("Usage:%s port\n",argv[0]);
        return 1;
    }

    //获得输入的端口
    port=atoi(argv[1]);

    //创建套接字用于服务器的监听
    listen_fd=socket(PF_INET,SOCK_STREAM,0);
    if(listen_fd<0)
    {
        perror("cannot create listening socket");
        return 1;
    }

    //填充关于服务器的套节字信息
    memset(&srv_addr,0,sizeof(srv_addr));
    srv_addr.sin_family=AF_INET;
    srv_addr.sin_addr.s_addr=htonl(INADDR_ANY);
    srv_addr.sin_port=htons(port);

    //将服务器和套节字绑定
    ret=bind(listen_fd,(struct sockaddr *)&srv_addr,sizeof(srv_addr));
    if(ret==-1)
    {
        perror("cannot bind server socket");
        close(listen_fd);
        return 1;
    }

    //监听指定端口，连接5个客户端
    ret=listen(listen_fd,5);
    if(ret==-1)
    {
        perror("cannot listen the client connect request");
        close(listen_fd);
        return 1;
    }
    //对每个连接来的客户端创建一个线程，单独与其进行通信
    //首先调用read函数读取客户端发送来的信息
    //将其转换成大写后发送回客户端
    //当输入“@”时，程序退出
    while(1)
    {
        len=sizeof(clt_addr);
        com_fd=accept(listen_fd,(struct sockaddr *)&clt_addr,&len);
        if(com_fd<0)
        {
            if(errno==EINTR)
            {
                continue;
            }
            else
            {
                perror("cannot accept client connect request");
                close(listen_fd);
                return 1;
            }
        }
        printf("com_fd=%d\n",com_fd);//打印建立连接的客户端产生的套节字
        if((pthread_create(&tid,NULL,thr_fn,&com_fd))==-1)
        {
            perror("pthread_create error");
            close(listen_fd);
            close(com_fd);
            return 1;
        }
    }
    return 0;
}

//打印线程 IDs
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
pthread_t ntid;
void printids(const char *s) {
    pid_t pid;
    pthread_t tid;
    pid = getpid();
    tid = pthread_self();
    printf("%s pid %u tid %u (0x%x)\n", s, (unsigned int) pid,
    (unsigned int) tid, (unsigned int) tid);
}

void *thr_fn(void *arg) {
    printids("new thread: ");
    return ((void *) 0);
}

int main(void) {
    int err;
    err = pthread_create(&ntid, NULL, thr_fn, NULL);
    if (err != 0)
        printf("can‘t create thread: %s\n", strerror(err));
    printids("main thread:");
    sleep(1);
    exit(0);
}