关于一个 date-time 时间服务的daemon process 的代码实现

简单的 daemon process 的实现，主要的步骤是：fork -> setsid -> umusk -> chdir -> close fds -> openlog -> 服务程序！

server.c

#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <netinet/in.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <sys/select.h>#define MAXLINE 1024#define SERV_PORT 60000//!>void send_and_recv( int connfd ){ char buf[50];memset( buf, 0, sizeof( buf ) ); read( connfd, buf, sizeof( buf ) ); puts( buf );}int main( int argc, char ** argv ){ //!> char * SERV_IP = "10.30.97.188"; char buf[MAXLINE]; int connfd; struct sockaddr_in servaddr; if( argc !=2 ) { printf("Input server ip !\n"); exit(EXIT_FAILURE ); } //!> 建立套接字 if( ( connfd= socket( AF_INET, SOCK_STREAM, 0 ) ) == -1 ) { printf("Socket Error...\n" , errno ); exit(EXIT_FAILURE ); } //!> 套接字信息 bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(SERV_PORT); inet_pton(AF_INET, argv[1],&servaddr.sin_addr); //!> 链接server if( connect(connfd, ( struct sockaddr * )&servaddr, sizeof( servaddr ) ) < 0) { printf("Connect error..\n"); exit(EXIT_FAILURE); } //!> //!> send and recv send_and_recv( connfd ); //!> close(connfd ); return 0;}
编译运行： gcc -o server server.c

gcc -o client client.c

./server

./client

简单DEMO而已～～～