C-socket编程-多进程版并发服务器

来源：互联网发布：linux export 编辑：程序博客网时间：2024/05/19 13:27

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <arpa/inet.h>#include <sys/socket.h>#include <netinet/in.h>#include "wrap.h"int main(){        //创建套接字        int serv_sock = Socket(AF_INET,SOCK_STREAM,0);        //将套接字与IP,PORT绑定        //创建sokaddr_in结构体，并经行本地字节序和网络字节序的转换        struct sockaddr_in serv_addr;        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(1234);        Bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr));        //进入监听状态，等待用户发起请求        listen(serv_sock,20);        //接收客户端请求        struct sockaddr_in clnt_addr;        socklen_t clnt_addr_size =sizeof(clnt_addr);        int clnt_sock;        int pid;        while((clnt_sock=Accept(serv_sock,(struct sockaddr *)&clnt_addr,&clnt_addr_size)) !=0)        {                pid=fork();                if(pid==-1)                {                        perror("fork err");                        exit(1);                }                if(pid==0)                {                        char buf[4096];                        int n,i;                        while((n=read(clnt_sock,buf,sizeof(buf))) != 0)                        {                                for(i=0;i<n;i++)                                {                                        buf[i]=toupper(buf[i]);                                }                                write(clnt_sock,buf,n);                        }                        //关闭套接字                        close(clnt_sock);                        exit(2);                }                else                {                        //关闭套接字                        close(clnt_sock);                }        }        close(serv_sock);        return 0;}

第二个例子

/* For sockaddr_in */#include <netinet/in.h>/* For socket functions */#include <sys/socket.h>#include <unistd.h>#include <string.h>#include <stdio.h>#include <stdlib.h>#define MAX_LINE 16384charrot13_char(char c){    /* We don't want to use isalpha here; setting the locale would change     * which characters are considered alphabetical. */    if ((c >= 'a' && c <= 'm') || (c >= 'A' && c <= 'M'))        return c + 13;    else if ((c >= 'n' && c <= 'z') || (c >= 'N' && c <= 'Z'))        return c - 13;    else        return c;}voidchild(int fd){    char outbuf[MAX_LINE+1];    size_t outbuf_used = 0;    ssize_t result;    while (1) {        char ch;        result = recv(fd, &ch, 1, 0);        if (result == 0) {            break;        } else if (result == -1) {            perror("read");            break;        }        /* We do this test to keep the user from overflowing the buffer. */        if (outbuf_used < sizeof(outbuf)) {            outbuf[outbuf_used++] = rot13_char(ch);        }        if (ch == '\n') {            send(fd, outbuf, outbuf_used, 0);            outbuf_used = 0;            continue;        }    }}voidrun(void){    int listener;    struct sockaddr_in sin;    sin.sin_family = AF_INET;    sin.sin_addr.s_addr = 0;    sin.sin_port = htons(40713);    listener = socket(AF_INET, SOCK_STREAM, 0);#ifndef WIN32    {        int one = 1;        setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));    }#endif    if (bind(listener, (struct sockaddr*)&sin, sizeof(sin)) < 0) {        perror("bind");        return;    }    if (listen(listener, 16)<0) {        perror("listen");        return;    }    while (1) {        struct sockaddr_storage ss;        socklen_t slen = sizeof(ss);        int fd = accept(listener, (struct sockaddr*)&ss, &slen);        if (fd < 0) {            perror("accept");        } else {            if (fork() == 0) {                child(fd);                exit(0);            }        }    }}intmain(int c, char **v){    run();    return 0;}

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