/* 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 <stdio.h> , <string.h> , <unistd.h> 01a,09Feb94,ms   cleaned up for VxDemo. */  #include "vxWorks.h" #include <stdio.h> #include <string.h> #include <unistd.h> #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. */     }