server.c

用于 UNIX通信的代码 可以实现客户端和服务端通信。

#include<stdlib.h>
#include<netinet/in.h>
#include<stdio.h>
#include<errno.h>
#include<string.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<sys/wait.h>

#define	SERUPORT 55555
#define BACKLOG  10

static void sub_proc(int conn_sock); 

int main(void){
	int	sockfd;
	int	client_fd;
	pid_t	pid;	

	struct	sockaddr_in	my_addr;
	struct	sockaddr_in	remote_addr;

	if((sockfd=socket (AF_INET, SOCK_STREAM, 0)) == -1){
		perror("you are creat sock is error");
		exit(1);
	}

	my_addr.sin_port=htons(SERUPORT);
	my_addr.sin_addr.s_addr= INADDR_ANY;
	my_addr.sin_family=AF_INET;
	bzero(&(my_addr.sin_zero) , 8);

	if(bind(sockfd,(struct sockaddr *)&my_addr, sizeof(struct sockaddr))
	 == -1){
		perror(" bind is error");
		exit(1);	
	}
	if(listen(sockfd, BACKLOG)==-1){
		perror("listen is error");
		exit(1);
	}

	while(1){
		int sin_size = sizeof(struct sockaddr_in);	
		if((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1){
			printf("accept is error[%d]\n", errno);
			exit(0);
		}		
		printf("receiverd is connection from %s\n", inet_ntoa(remote_addr.sin_addr));
		printf("client_fd[%d]\n", client_fd);

		pid = fork();
		if(pid < 0){
			printf("Create process Error[%d]\n", errno);
			exit(0);
		}
		else if(pid == 0){
			sub_proc(client_fd);
			close(client_fd);
		}
		else{
			// Parent
			close(client_fd);
		}
	}
}

static void sub_proc(int conn_sock) 
{
	if(send (conn_sock,"HELLOW,you are is connected!\n",28 ,0)== -1){
		perror("send id error");
		exit(0);
	}

	return;
}