www.pudn.com > vxworks_networking.rar > vxServer.c

/* vxServer.c - Example code of UDP server. */
 
 /* Copyright 1984-1997 Wind River Systems, Inc. */
 
 /*
 modification history
 --------------------
 01d,06nov97,mm   added copyright.
 01c,26Sep97,mm   cast agr.1 of bzero
 01b,26Sep97,mm   added include  ,  , 
 01a,09Feb94,ms   cleaned up for VxDemo.
 */
 
 #include "vxWorks.h"
 #include 
 #include 
 #include 
 #include "socket.h"
 #include "in.h"
 #include "inetLib.h"
 #include "udpExample.h" 
 
 /*****************************************************************************
  * myServer - Server reads from local socket and displays client's message. 
  * If requested, server sends a reply back to the client. Code executes on
  * VxWorks target and use VxWorks header files.
  *
  *  EXAMPLE:
  *
  *     To run this myServer task, from the VxWorks shell do as follows:
  *     -> sp (vxUdpServer)
  *
  *  RETURNS: OK or ERROR
  */
  
 STATUS vxUdpServer()
     {
     struct sockaddr_in myAddr;		/* Server socket address */
     struct sockaddr_in clientAddr;	/* Socket address for client */
     struct request clientRequest;	/* Request/Message from client */
     int sFd;				/* Server's socket file descriptor */
     char inetAddr[INET_ADDR_LEN];	/* Buffer for dot notation *
                         		 * internet addr of client */
 
     /* Size of socket address structure */
     int sockAddrSize = sizeof (struct sockaddr_in);
 
     LOCAL char replyMsg[] = "Server received your message";
 
     /* Build socket address */
     bzero ((char *) &myAddr, sockAddrSize);
     myAddr.sin_family = AF_INET;
     myAddr.sin_port = htons (SERVER_PORT_NUM);
     myAddr.sin_addr.s_addr = htonl (INADDR_ANY);
 
     /* Create socket */
     if ((sFd = socket (AF_INET, SOCK_DGRAM, 0)) == ERROR)
         {
 	perror ("socket");
 	close (sFd);
 	return (ERROR);
 	}
 
     /* Bind socket to local address */
     if (bind (sFd, (struct sockaddr *) &myAddr, sockAddrSize) 
                                                        	== ERROR)
         {
         perror ("bind");
 	close (sFd);
 	return (ERROR);
 	}
 
 
     FOREVER
         {
 	/* Read data from a socket and satisfy requests */
 	if (recvfrom (sFd, &clientRequest, sizeof (clientRequest), 0,
 		      (struct sockaddr *) &clientAddr,&sockAddrSize) == ERROR)
             {
             perror ("recvfrom");
             close (sFd);
             return (ERROR);
             }
         /* Convert internet address to dot notation for displaying */
 	inet_ntoa_b (clientAddr.sin_addr, inetAddr);
 	printf ("MESSAGE FROM: Internet Address %s, port %d\n%s\n",
  		inetAddr, ntohs (clientAddr.sin_port), clientRequest.message);
 
 	/* If client requested a reply, send acknowledgment */
 	if (clientRequest.reply)
             if (sendto (sFd, replyMsg, sizeof (replyMsg), 0, 
                         (struct sockaddr *) &clientAddr,sockAddrSize) == ERROR)
             {
             perror ("sendto");
             close (sFd);
             return (ERROR);
             }
         }
 
     close (sFd); /* Just in case. Should never get here. */
     }