net_test_2440.c

linux下的一个简单socket示例

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

#define SERVER_PORT 4000 // define the defualt connect port id
#define CLIENT_PORT ((20001+rand())%65536) // define the defualt client port as a random port

#define BUFZISE 2048

int sendData(int *s, char * buffer, int length);
int recvData(int *s, char * buffer, int length);

int main()
{
	int servfd,clifd,i;
	struct sockaddr_in servaddr,cliaddr;
	socklen_t socklen = sizeof(servaddr);
	char sendBuf[BUFZISE],recvBuf[BUFZISE];

	for(i=0;i<BUFZISE;i++)
		sendBuf[i]=i/128;

	if ((clifd = socket(AF_INET,SOCK_STREAM,0)) < 0)
	{
		printf("create socket error!\n");
		exit(1);
	}

	cliaddr.sin_family = AF_INET;
	cliaddr.sin_port = htons(CLIENT_PORT);
	cliaddr.sin_addr.s_addr = htons(INADDR_ANY);

	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(SERVER_PORT);
	//servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
	inet_aton("222.204.232.115",&servaddr.sin_addr);

	if (bind(clifd,(struct sockaddr*)&cliaddr,sizeof(cliaddr))<0)
	{
		printf("bind to port %d failure!\n",CLIENT_PORT);
		exit(1);
	}

	if (connect(clifd,(struct sockaddr*)&servaddr, socklen) < 0)
	{
		printf("can't connect to pc!\n");
		exit(1);
	}

	int tmp=BUFZISE;

	while(1)
	{
		if( sendData(&clifd,sendBuf,BUFZISE) == -1 )
		{
			printf("send failed, program exit\n");
			exit(1);
		}
		printf("now send %d Bytes to PC\n", tmp);

		if( (recvData(&clifd,recvBuf,BUFZISE)) == -1 )
		{
			printf("receive failed, program exit\n");
			exit(1);
		}
		printf("receive %d Bytes from PC\n", tmp);
	}

	close(clifd);
	return 0;
}

int sendData(int *s,char * buffer,int length)
{
	int len, sendlen = 0;
	int count=0;

	while (sendlen < length)
	{
		len = send(*s, buffer+sendlen, length - sendlen, 0);
		if(len <= 0)
		{
			if( ++count == 5 )//允许5次接收失败
				return -1;
		}
		else
			sendlen += len;
	}
	return 0;
}

int recvData(int *s,char * buffer,int length)
{
	int len, recvlen = 0;
	int count=0;

	while (recvlen < length)
	{
		len = recv(*s, buffer+recvlen, length - recvlen, 0);
		if(len <= 0)
		{
			if( ++count == 5 )//允许5次接收失败
				return -1;
		}
		else
			recvlen += len;
	}
	return 0;
}