TCP/IP 多进程服务端

阳光穿透心脏的1/2处 2022-10-01 09:54 98阅读 0赞

echo\_server.c

#include <stdio.h>
    #include <signal.h>
    #include <sys/wait.h>
    #include <unistd.h>
    #include <stdlib.h>
    #include <string.h>
    #include <arpa/inet.h>
    #include <sys/socket.h>
    
    #define BUF_SIZE 1024
    
    void read_childproc(int sig)
    {
        pid_t pid;
        int status;
    
        pid = waitpid(-1, &status, WNOHANG);
        printf("removed proc id: %d\n", pid);
    }
    
    int main()
    {
    
        //注册子进程信号
        struct sigaction act;
        act.sa_sigaction = read_childproc;
        sigemptyset(&act.sa_mask);
        act.sa_flags = 0;
        sigaction(SIGCHLD, &act, 0);
    
        int serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    
        //初始化地址
        struct sockaddr_in serv_addr;
        memset(&serv_addr, 0, sizeof(serv_addr));
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
        serv_addr.sin_port = htons(9200);
    
        if (bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
        {
            printf("绑定地址失败 \n");
            exit(1);
        }
    
        if (listen(serv_sock, 5) == 1)
        {
            printf("绑定端口失败 \n");
            exit(1);
        }
    
        接收请求///
        struct sockaddr_in clnt_adr;
        int clnt_sock, adr_sz, str_len;
        pid_t pid;
        char buf[BUF_SIZE];
    
        while (1)
        {
            adr_sz = sizeof(clnt_adr);
            clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_adr, &adr_sz);
            if (clnt_sock == -1)
            {
                continue;
            }
            else
            {
                puts("new client connected...");
            }
    
            pid = fork();
            if (pid == -1)
            {
                puts("-1 -1 -1");
                close(clnt_sock);
                continue;
            }
    
            //子进程处理
            if (pid == 0)
            {
                //关闭复制到的父文件号
                close(serv_sock);
                while ((str_len = read(clnt_sock, buf, BUF_SIZE)) != 0)
                    write(clnt_sock, buf, str_len);
                
                close(clnt_sock);
                puts("子进程受理");
                //正常退出子进程
                return 0;
            }
            else
            {
                puts("父进程不处理 clnt_sock");
                close(clnt_sock);
            }
        }
    
        close(serv_sock);
        return 0;
    }
    复制代码

echo\_client.c

#include <stdio.h>
    #include <string.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>
    
    #define BUF_SIZE 5
    
    int main(int argc, char *argv[])
    {
        char message[BUF_SIZE];
        int str_len, recv_len, recv_cnt, i;
    
        struct sockaddr_in serv_addr, clnt_addr;
    
        int serv_sock = socket(PF_INET, SOCK_STREAM, 0);
        if (serv_sock == -1)
        {
            printf("socket() error");
            exit(1);
        }
    
        memset(&serv_addr, 0, sizeof(serv_addr));
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
        serv_addr.sin_port = htons(9200);
    
        if (connect(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
        {
            printf("connect() error");
            exit(1);
        }
    
        while (1)
        {
            fputs("请输入您的信息,按Q键退出\n", stdout);
            fgets(message, 1024, stdin);
    
            //因为fgets会保留输入中换行符,故判断加\n
            if (!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
            {
                break;
            }
    
            write(serv_sock, message, strlen(message));
            str_len = read(serv_sock, message, BUF_SIZE);
    
            printf("Message from server: %s\n", message);
        }
    
        close(serv_sock);
        return 0;
    }
    复制代码

转载于:https://juejin.im/post/5cdc16d251882568651553f8