linux下socket和fork结合使用的例子

#include <stdio.h> #include <stdlib.h> #include <i386-linux-gnu/sys/socket.h> #include <unistd.h> #include <i386-linux-gnu/sys/types.h> #include <netinet/in.h> #include <time.h> #include <string.h> #include <arpa/inet.h> #define SERVER_PORT 20000 #define LENGTH_OF_LISTEN_QUEUE 10 #define BUFFER_SIZE 255 #define WELCOME_MESSAGE "welcome to 2b qianbi!!!" int main() { printf("prostart!\n"); int servfd, clifd; struct sockaddr_in servaddr,cliaddr; if((servfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { printf("create socket error!"); exit(1); } bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(SERVER_PORT); servaddr.sin_addr.s_addr = htons(INADDR_ANY); if(bind(servfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0) { printf("bind to port %d failure!\n", SERVER_PORT); exit(1); } if(listen(servfd, LENGTH_OF_LISTEN_QUEUE) < 0) { printf("call listen failure!\n"); exit(1); } while(1) { char buf[BUFFER_SIZE]; long timestamp; socklen_t length = sizeof(cliaddr); clifd = accept(servfd, (struct sockaddr*)&cliaddr, &length); if(clifd < 0) { printf("error, comes when call accept!\n"); break; } printf("from client, IP:%s,Port:%d.\n", inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port)); long pid; switch (pid = fork()) { case 0://子进程关闭服务端句柄后 do something... close(servfd); timestamp = time(NULL); strcpy(buf, WELCOME_MESSAGE); strcat(buf, "time in server:"); strcat(buf, ctime(&timestamp)); send(clifd, buf, BUFFER_SIZE, 0); close(clifd); exit(0);//处理完客户端的请求后退出 break; case -1: perror("fork error"); break; default://父进程 close(clifd); break; } } //close(servfd); return 0; }