Linux下CGI服务器基本工作原理

#include <sys/socket.h>
#include <netinet/in.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

int main()
{
    const char *ip="127.0.0.1";
    int port=12345;
    struct sockaddr_in address;
    bzero(&address,sizeof(address));
    address.sin_family=AF_INET;
    inet_pton(AF_INET,ip,&address.sin_addr);
    address.sin_port=htons(port);
    int sock=socket(PF_INET,SOCK_STREAM,0);
    assert(sock>=0);
    int ret=bind(sock,(struct sockaddr *)&address,sizeof(address));
    ret=listen(sock,5);
    struct sockaddr_in client;
    socklen_t client_addrlength=sizeof(client);
    int connfd=accept(sock,(struct sockaddr *)&client,&client_addrlength);
    if(connfd<0)
    {
        printf("Errorno os:%d\n",errno);
    }
    else
    {
        close(STDOUT_FILENO);
        dup(connfd);
        printf("abcd\n");
        close(connfd);
    }
    close(sock);
    return 0;
}