client.c

用于 UNIX通信的代码 可以实现客户端和服务端通信。

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

#define seruport	55555
#define MAXDATASIZE	100

int main(int argc,char *argv[]){
	int	sockfd;
	int	recybytes;
	char	buf[MAXDATASIZE];
	
	struct	hostent	*host;
	struct	sockaddr_in	serv_addr;

	if(argc <2){
		fprintf(stderr, "pleares ebnter the is hostname!\n");
		exit(1);
	}
	if((host=gethostbyname(argv[1])) == NULL){
		perror("get by name is error");
		exit(1);
	}
	if((sockfd =socket(AF_INET,SOCK_STREAM, 0))== -1){
		perror("socket creat is error");
		exit(1);
	}
	
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(seruport);
	serv_addr.sin_addr=*((struct in_addr *)host->h_addr);
	bzero(&(serv_addr.sin_zero),8);

	if(connect (sockfd,(struct sockaddr *)&serv_addr ,sizeof(struct sockaddr)) == -1){
		perror("creat sock is error");
		exit(1);
	}
	if((recybytes =recv(sockfd ,buf ,MAXDATASIZE, 0))==-1){
		perror("recev is error");
		exit(1);
	}
	buf[recybytes]='\0';
	printf("receivers :%s",buf);
	close(sockfd);
}