Linux_Study/socklib.c at master · ixuanwu/Linux_Study · GitHub

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/*************************************************************************
	> File Name: socklib.c
	> Author: jianghechao
	> Mail: 591378033@qq.com
	> Created Time: Mon 21 Apr 2014 12:13:04 AM CST
 ************************************************************************/

#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#include<time.h>
#include<string.h>


#define HOSTLEN 256
#define BACKLOG 1

int make_server_socket_q(int ,int);
int make_server_socket(int portnum)
{
	return make_server_socket_q(portnum,BACKLOG);
}

int make_server_socket_q(int portnum,int backlog)
{
	fprintf(stdout,"The portnum is %d\n",portnum);
	struct sockaddr_in saddr;
	struct hostent *hp;
	char hostname[HOSTLEN];
	int sock_id;
	sock_id = socket(AF_INET,SOCK_STREAM,0);
	if(sock_id==-1)
	{
		fprintf(stderr,"socket error in socklib\n");
		return -1;
	}
	fprintf(stderr,"socket success in socklib\n");
	bzero((void*)&saddr,sizeof(saddr));
/*	gethostname(hostname,HOSTLEN);
	fprintf(stdout,hostname);

	hp = gethostbyname(hostname);
	if(hp==NULL)
	{
		fprintf(stderr,"gethostbyname error in socklib\n");
		return -1;
	}
	bcopy((void*)hp->h_addr,(void *)&saddr.sin_addr,hp->h_length);
*/
	saddr.sin_addr.s_addr = inet_addr("192.168.56.101");
	saddr.sin_port = htons(portnum);
	saddr.sin_family = AF_INET;
	if(bind(sock_id,(struct sockaddr *)&saddr,sizeof(saddr))!=0)
	{
		fprintf(stderr,"bind error  in socklib\n");
		return -1;
	}
	if(listen(sock_id,backlog)!=0)
	{
		fprintf(stderr,"listen error in socklib\n");
		return -1;
	}
	return sock_id;
}
int connect_to_server(char *host, int portnum)
{
	int sock;
	struct sockaddr_in servadd;
	struct hostent *hp;
	sock = socket(AF_INET,SOCK_STREAM,0);
	if(sock==-1)
		return -1;
	bzero(&servadd,sizeof(servadd));
	hp = gethostbyname(host);
	if(hp==NULL)
		return -1;
	bcopy(hp->h_addr,(struct sockaddr*)&servadd.sin_addr,hp->h_length);
	servadd.sin_port = htons(portnum);
	servadd.sin_family = AF_INET;
	if(connect(sock,(struct sockaddr*)&servadd,sizeof(servadd))!=0)
		return -1;
	return sock;
}