_getlong()--Get Long Byte Quantities

 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <resolv.h>

 unsigned long
          _getlong(unsigned char *message_pointer)

The _getlong() function is used to retrieve an unsigned long byte quantity.

Authorities and Locks

None.

Parameters

message_pointer

(Input) The pointer where the long integer is to be received from.

Return Value

_getlong() returns a 32-bit integer from where message_pointer is pointing.

Usage Notes

1. DNS packets have fields that are unsigned long integers (for example, TTL and serial number). _getlong() picks these unsigned long integers out of a DNS packet and returns them.

Related Information

• _getshort()--Get Short Byte Quantities
  
  
• _putlong()--Put Long Byte Quantities
  
  
• _putshort()--Put Short Byte Quantities