Linux网络编程之多进程

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多进程模型

多进程模型下，注意如何在进程之间通信以及孤儿进程和僵尸进程的处理，可以外配上进程池作为计算任务/异步任务的处理。

//fork server#include <stdio.h>#include <string.h>#include <unistd.h>#include <sys/socket.h>#include <netdb.h>#include <stdlib.h>#include <netinet/in.h>#include <sys/wait.h>#include <signal.h>void run();int main(int argc, char *argv[]){    run();    return 0;}void handle_client_socket(int clientfd){    //read from client socket    char readbuf[1024];    ssize_t readlen;    while(1){        readlen = read(clientfd, readbuf, sizeof(readbuf));        if (readlen==-1){            perror("read client error");            close(clientfd);            return;        }else if(readlen==0){            break;        }else{            fwrite(readbuf, readlen, 1, stdout);            //write back to client            if(write(clientfd, readbuf, readlen)==-1){                perror("write back to client error");                close(clientfd);                return;            }        }    }    close(clientfd);}void reap(int signum){    while(waitpid(-1, NULL, WNOHANG)>0);    return;}void run(){    //get hostent    struct hostent *h = gethostbyname("127.0.0.1");    if(!h){        perror("resolve host failed");        exit(EXIT_FAILURE);    }    //create server socket    int fd = socket(AF_INET, SOCK_STREAM, 0);    if(fd==-1){        perror("socket create failed");        exit(EXIT_FAILURE);    }    //server bind    struct sockaddr_in server;    server.sin_family = AF_INET;    server.sin_addr = *(struct in_addr *)h->h_addr_list[0];    server.sin_port = htons(8000);    if(bind(fd, (struct sockaddr *)&server, sizeof(server))==-1){        perror("bind error");        close(fd);        exit(EXIT_FAILURE);    }    int reuse = 1;    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))<0){        perror("error setsockopt");        exit(EXIT_FAILURE);    }    //server listen    if(listen(fd,20)==-1){        perror("listen error");        close(fd);        exit(EXIT_FAILURE);    }    signal(SIGCHLD,reap);    //server loop    while(1){        //struct sockaddr_in client;        struct sockaddr_storage client;        int clientfd;        socklen_t socklen = sizeof(client);        clientfd = accept(fd, (struct sockaddr *)&client, &socklen);        if (clientfd==-1){            perror("error accept");            close(fd);            exit(EXIT_FAILURE);        }        pid_t pid = fork();        if(pid==-1){            perror("fork error");            close(fd);            exit(EXIT_FAILURE);        }        if (pid==0){            //close parent listening fd            close(fd);            handle_client_socket(clientfd);            exit(EXIT_SUCCESS);        }        if (pid>0){            //close client fd            close(clientfd);        }    }}

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