socklib.c

嵌入式Linux C语言应用程序设计所有程序代码

#include <stdio.h>
#include <stdlib.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)
{
	struct sockaddr_in saddr;
	struct hostent *hp;
	char hostname[HOSTLEN];
	int sock_id;
	
	sock_id = socket(PF_INET, SOCK_STREAM, 0);
	if(sock_id == -1)
		return -1;
		
	bzero((void *)&saddr, sizeof(saddr));
	gethostname(hostname, HOSTLEN);
	saddr.sin_port = htons(portnum);
	saddr.sin_family = AF_INET;
	if(bind(sock_id, (struct sockaddr *)&saddr, sizeof(saddr)) != 0)
		return -1;
		
	if(listen(sock_id, backlog) != 0)
		return -1;
	return sock_id;		
}

int connet_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;		
}