/* broadcastsend.c - Demo for sending a broadcast  message */  /* modification history --------------------   01f,25nov97,rv   added return TRUE  01e,22sep97,mm   defined  broadcastSend(int port) 01d,22sep97,mm   cast arg 4 of setsockopt function 01c,22sep97,mm   cast arg 5 of sendto function 01b,22sep97,mm   added include <string.h> <errno.h> <unistd.h> <arpa/inet.h>  01a,08feb94,ms   cleaned and modified for VxDemo. */  #include <errno.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include "vxWorks.h" #include "socket.h" #include "sockLib.h" #include "in.h" #include <arpa/inet.h>  #define BROADCAST_ADDR "147.11.184.255" /* your subnet network's broadcast                                            * inet address                                           */  LOCAL char buf[] = "Hello, world!!!\n";  /* broadcast message */  /*****************************************************************************  * broadcastSend - Sends broadcasting message   *  * DESCRIPTION  *  *     Demo for sending broadcasting message.  *  * RETURNS: OK or ERROR  *  * CONFIGURATION:  *  * You need to set/change the value of the BROADCAST_ADDR constant to   * your (subnet) network's broadcast inet address.  *  * EXAMPLE:  *  *     Run broadcastSend task on one VxWorks system as follows  *     after starting the broadcastGet task from another VxWorks system  *     in the same physical network. The other half of the demonstration  *     is in broadcastGet.c.  *  *     -> sp (broadcastSend,  7001)  *  *     where 7001 (port number should be greater than 5000 for user-developed)  *     is an example port number used in this demonstration to send the  *     broadcast message.  *  */  STATUS broadcastSend(int port);  STATUS broadcastSend      (     int port                             /* port number */     )      {     int sockFd;                          /* socket fd */     struct sockaddr_in sendToAddr;       /* receiver's addresss */     int   sendNum ;     int   on;       /* Open UDP socket */     sockFd = socket(AF_INET, SOCK_DGRAM, 0);     if (sockFd == ERROR)    	{  	perror ("socket not opened "); 	return (ERROR); 	}       /* Use the SO_BROADCAST option when an application needs to broadcast data      */        on = 1; /* turn ON SO_BROADCAST option*/     if (setsockopt (sockFd, SOL_SOCKET, SO_BROADCAST, (char *) &on, sizeof(int))  ==                       ERROR) 	{ 	perror ("setsockopt failed "); 	return (ERROR); 	}      /* zero out the sockaddr_in structures and setup receivers' address */      bzero ((char *) &sendToAddr, sizeof (struct sockaddr_in));     sendToAddr.sin_family = AF_INET;     sendToAddr.sin_port = htons (port);     sendToAddr.sin_addr.s_addr = inet_addr (BROADCAST_ADDR);      /* send the broadcast message to other systems in the same network */     if ((sendNum = sendto (sockFd, buf, sizeof (buf), 0, (struct sockaddr  *) &sendToAddr,  	sizeof (struct sockaddr_in))) == ERROR)     	{     	perror ("sendto broadcast failed ");        	return (ERROR); 	}      printf ("%d bytes of broadcast message sent: %s\n", sendNum, 	            buf);     close (sockFd);     return(TRUE);     }