server.c

在linux下实现的client/server模式的程序

#include <stdio.h>
#include <sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#define MAX_CONNECT 2

static int libsk_create_server(char *ip, short port)
{       
	int listenfd;
	struct sockaddr_in cliaddr, servaddr;

	listenfd = socket(AF_INET, SOCK_STREAM, 0);

	bzero(&servaddr, sizeof(servaddr));

	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = inet_addr(ip);
	servaddr.sin_port = htons(port);

	bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr));

	if(listen(listenfd, MAX_CONNECT) < 0)
	{
		listenfd = -1;
	}

	return listenfd;
}

static int libsk_accept(int sk)
{
	int fd;
	struct sockaddr_in addr;
	int sin_size=sizeof(struct sockaddr_in);
	fd = accept(sk , (struct sockaddr*)&addr , &sin_size);
	return fd;
}

static int libsk_connect_to(char *serverip, short port)
{
	int fd, ret;
	struct sockaddr_in servaddr;

	if(!serverip)
	{
		return -1;
	}
	fd = socket(AF_INET, SOCK_STREAM, 0);

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(port);
	inet_pton(AF_INET, serverip, &servaddr.sin_addr);
	ret = connect(fd, (struct sockaddr *) &servaddr, sizeof(servaddr));
	if(ret == -1)
	{
		perror("failed:");
		close(fd);
		fd = -1;
	}

	return fd;
}

static int libsk_close(int sk)
{
	if((sk != 0) && (sk != -1))
	{
		close(sk);
	}
	return 0;
}

int main()
{
	int listen_fd;
	unsigned char buffer[32];

	listen_fd = libsk_create_server("192.168.6.148", 10027);
	if(listen_fd < 0)
	{
		exit(0);
	}

	while(1)
	{
		int fd = 0;
		fd = libsk_accept(listen_fd);
		if(fd > 0)
		{
			memset(buffer , 0 , 32);
			if(read(fd,  buffer , 32) > 0)
			{
				buffer[31] = 0;
				printf("%s\n", buffer);
			}
		}
	}
}