socket.c

网络客户端软件,用于与服务器进行通信与连接

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>

#define SERVER_PORT 3332
#define MAX_LINE 256

int main(int argc,char *argv[])
{  
	  FILE *fp;
		struct hostent *hp;
		struct sockaddr_in sin;
    char *host;
		char buf[MAX_LINE];
		int s;
		int len;

		if(argc == 2)
		{
		   host = argv[1];
		}
		else
		{
		   fprintf(stderr,"usage: simplex-talk host\n");
			 exit(1);
		}
    
	  hp = gethostbyname(host);
		if(!hp)
		{
		   fprintf(stderr,"unknow host:%s\n",host);
       exit(1);
		}

		bzero((char *)&sin,sizeof(sin));
		sin.sin_family = AF_INET;
		bcopy(hp->h_addr,(char *)&sin.sin_addr,hp->h_length);
		sin.sin_port = htons(SERVER_PORT);

		if((s = socket(PF_INET,SOCK_STREAM,0)) < 0)
		{
		   perror(":socket");
			 exit(1);
		}

		if(connect(s,(struct sockaddr *)&sin,sizeof(sin)) < 0)
		{
		   perror("connect");
			 close(s);
			 exit(1);
		}

		while(fgets(buf,sizeof(buf),stdin))
    {
		      buf[MAX_LINE-1]='\0';
					len = strlen(buf)+1;
					send(s,buf,len,0);
		}  
}