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C Programming.. Typecasting of structure pointers..
Post 302694583 by Priya Amaresh on Friday 31st of August 2012 04:32:32 AM
08-31-2012
Thanks a lot.. This was the exact thing i was searching to do.. It really worked.. 
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msgb
msgb(9S) Data Structures for Drivers msgb(9S) NAME
msgb, mblk - STREAMS message block structure SYNOPSIS
#include <sys/stream.h> INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI) DESCRIPTION
A STREAMS message is made up of one or more message blocks, referenced by a pointer to a msgb structure. The b_next and b_prev pointers are used to link messages together on a QUEUE. The b_cont pointer links message blocks together when a message consists of more than one block. Each msgb structure also includes a pointer to a datab(9S) structure, the data block (which contains pointers to the actual data of the message), and the type of the message. STRUCTURE MEMBERS
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datab(9S) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 11 Apr 1991 msgb(9S)