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Receiving UDP broadcasts

Is there any special trick to receiving UDP broadcasts? When I run the following code, I get nada. But I can see the UDP broadcast packets coming in via tcpdump. The packets are being sent by an SNMP aware router. I am on the same subnet as the router (it's my DHCP server), and I am running the process as root. BTW, I tried using recvfrom instead of CFSocket and get the same results (or lack thereof).

Thanks for any insight you can give.

#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <CoreFoundation/CoreFoundation.h>

void SNMPSocketCallBack( CFSocketRef, CFSocketCallBackType, CFDataRef, const void *, void * );

int main( int argc, int argv )
{
int theSocket;
struct sockaddr_in theAddress;
CFSocketContext theContext = { 0, NULL, NULL, NULL, NULL };
CFSocketRef theSocketRef;
CFRunLoopSourceRef theRLSourceRef;

theAddress.sin_addr.s_addr = INADDR_ANY;
theAddress.sin_len = 0;
theAddress.sin_family = AF_INET;
theAddress.sin_port = htons( 162 );

theSocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );

bind( theSocket, (struct sockaddr *) &theAddress, sizeof( theAddress ) );

theSocketRef = CFSocketCreateWithNative( NULL, theSocket, kCFSocketReadCallBack, SNMPSocketCallBack, &theContext );
theRLSourceRef = CFSocketCreateRunLoopSource( NULL, mSNMPSocketRef, 0 );

CFRunLoopAddSource( CFRunLoopGetCurrent(), theRLSourceRef, kCFRunLoopDefaultMode );
CFRelease( theRLSourceRef );
}

void
SNMPSocketCallBack(
CFSocketRef inSocketRef,
CFSocketCallBackType inCallBack,
CFDataRef inAddressRef,
const void *inDataRef,
void *inInfo )
{
printf( "SNMPSocketCallBack called\n" );
}
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