linux tcp 通信 读写线程

查看进程的线程数

1.查找到进程的pid

2.top -H -p pid

服务端

#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>
#include<iostream>
#include<thread>

#define MAXLINE 4096

void *do_read(void *fdArg)
{
    int listenfd = (int)(*((int *)fdArg));
    char  buff[4096];
    int  n = 0;
    while(1)
    {
        memset(buff, 0, 4096);
        n = recv(listenfd, buff, MAXLINE, 0);
        buff[n] = '\0';
        if(strlen(buff) > 2)
        {
            printf("recv msg from client: %s\n", buff);
        }
    }
    return NULL;
}

void *do_write(void *fdArg)
{
    int listenfd = (int)(*((int *)fdArg));
    char  buff[4096];
    int  n = 0;
    while(1)
    {
        memset(buff, 0, 4096);
        fgets(buff, 4096, stdin);
        if(strlen(buff))
        {
            printf("send msg to client: %s\n", buff);
            if(send(listenfd, buff, strlen(buff), 0) < 0){
                printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);
            }
        }
    }
    return NULL;
}


int main(int argc, char** argv){
    int  listenfd, connfd;
    struct sockaddr_in  servaddr;

    // 创建套接字
    if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){
        printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);
        return 0;
    }

    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(6666);
    
    /* 设置复用模式 */
    int opt = SO_REUSEADDR;
    if(setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1)
    {
        printf("setsockopt");
        return -1;
    }

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

    // 监听套接字
    if( listen(listenfd, 10) == -1){
        printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno);
        return 0;
    }

    // 准备通信
    printf("======waiting for client's request======\n");
    int ret_read, ret_write;
    pthread_t thread_read, thread_write;
    while(1){
        // 产生通信套接字
        if( (connfd = accept(listenfd, (struct sockaddr*)NULL, NULL)) == -1){
            printf("accept socket error: %s(errno: %d)",strerror(errno),errno);
            continue;
        }
        else
        {
            ret_read = pthread_create(&thread_read, NULL, do_read, &connfd);
            ret_write = pthread_create(&thread_write, NULL, do_write, &connfd);
            pthread_join(thread_read, NULL);
            pthread_join(thread_write, NULL);
            close(connfd);
            printf("close communicate socket.\n");
        }
    }

    close(listenfd);
    printf("close listen socket.\n");
    return 0;
}

 

客户端

#include<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<string.h>
#include<errno.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<pthread.h>

#define MAXLINE 4096
void *do_read(void *fdArg)
{
    int fd = (int)(*((int *)fdArg));
    char  buff[4096];
    int  n = 0;
    while(1)
    {
        memset(buff, 0, 4096);
        n = recv(fd, buff, MAXLINE, 0);
        buff[n] = '\0';
        if(strlen(buff) > 2)
        {
            printf("recv msg from server: %s\n", buff);
        }
    }
    return NULL;
}

void *do_write(void *fdArg)
{
    int fd = (int)(*((int *)fdArg));
    char  buff[4096];
    int  n = 0;
    while(1)
    {
        memset(buff, 0, 4096);
        fgets(buff, 4096, stdin);
        if(strlen(buff))
        {
            printf("send msg to server: %s\n", buff);
            if(send(fd, buff, strlen(buff), 0) < 0){
                printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);
            }
        }
    }
    return NULL;
}

int main(int argc, char** argv){
    int   sockfd;
    struct sockaddr_in  servaddr;

    // 对参数个数进行判断
    if( argc != 2){
        printf("usage: ./client <ipaddress>\n");
        return 0;
    }
    
    // 输出参数列表
    for(int i = 0; i < argc; i++)
    {
            std::cout << "argv[" << i << "]" << argv[i] << std::endl;
    }

    // 创建套接字
    if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
        printf("create socket error: %s(errno: %d)\n", strerror(errno),errno);
        return 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]);
        return 0;
    }

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

    // 通信
    int ret_read, ret_write;
    pthread_t thread_read, thread_write;
    ret_read = pthread_create(&thread_read, NULL, do_read, &sockfd);
    ret_write = pthread_create(&thread_write, NULL, do_write, &sockfd);


    pthread_join(thread_read, NULL);
    pthread_join(thread_write, NULL);
    close(sockfd);
    printf("close communicate socket.\n");
    return 0;
}