linux网络程序代码(UDP)

共有 4 条评论

1. heimanba 于 2011-10-23 00:20:15发表:

   3# tbamboo118
   
   
   想了解的话，去找本环境编程的书来看，看完就都懂了。其实不难理解。。

2. aokang 于 2011-10-22 15:07:09发表:

   求指导

3. tbamboo118 于 2011-10-22 14:19:03发表:

   大神，求解释 ...

4. juzixiangchang 于 2008-09-03 16:06:13发表:

   客户端:
   #include
   #include
   #include
   #include
   #include
   #include
   #include
   #include
   #include
   #include
   #include
   #include
   
   #define MYPORT 4950
   #define MAXBUFLEN 1024
   
   void sigchld_handler(int s)
   {
   while(wait(NULL)>0);
   }
   
   int main(int argc,char *argv[])
   {
   int sockfd;
   struct sockaddr_in their_addr;
   struct hostent *he;
   int numbytes;
   char send_buf[MAXBUFLEN];
   struct sigaction sa;
   
   if(argc!=2)
   {
   fprintf(stderr,"usage:talker hostname\n");
   exit(1);
   }
   
   if((he=gethostbyname(argv[1]))==NULL)
   {
   perror("gethostbyname fail\n");
   exit(1);
   }
   
   if((sockfd=socket(AF_INET,SOCK_DGRAM,0))==-1)
   {
   perror("socket fail\n");
   exit(1);
   }
   
   while(1)
   {
   char *ptr;
   their_addr.sin_family=AF_INET;
   their_addr.sin_port=htons(MYPORT);
   their_addr.sin_addr=*((struct in_addr *)he->h_addr);
   memset(&(their_addr.sin_zero),'\0',8);
   printf("send to server:");
   ptr=send_buf;
   
   sa.sa_handler=sigchld_handler;
   sigemptyset(&sa.sa_mask);
   sa.sa_flags=SA_RESTART;
   if(sigaction(SIGPIPE,&sa,NULL)==-1)
   {
   perror("sigaction fail\n");
   exit(1);
   }
   
   do
   {
   *ptr=getchar();
   ptr++;
   }while(*(ptr-1)!='\n');
   *ptr='\0';
   
   if((numbytes=sendto(sockfd,send_buf,strlen(send_buf),0,(struct sockaddr *)&their_addr,sizeof(struct sockaddr)))==-1)
   {
   perror("sendto fail\n");
   exit(1);
   }
   }
   close(sockfd);
   return 0;
   }