sunos man page for unlinkb

unlinkb(9F)						   Kernel Functions for Drivers 					       unlinkb(9F)

NAME
       unlinkb - remove a message block from the head of a message

SYNOPSIS
       #include <sys/stream.h>

       mblk_t *unlinkb(mblk_t *mp);

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

PARAMETERS
       mp	Pointer to the message.

DESCRIPTION
       unlinkb() removes the first message block from the message pointed to by  mp. A new message, minus the removed message block, is returned.

RETURN VALUES
       If  successful,	unlinkb() returns a pointer to the message with the first message block removed. If there is only one message block in the
       message, NULL is returned.

CONTEXT
       unlinkb() can be called from user or interrupt context.

EXAMPLES
       Example 1: unlinkb() example

       The routine expects to get passed an  M_PROTO T_DATA_IND message.  It will remove and free the  M_PROTO header  and  return  the  remaining
       M_DATA portion of the message.

	1  mblk_t *
	2  makedata(mp)
	3      mblk_t *mp;
	4  {
	5   mblk_t *nmp;
	6
	7   nmp = unlinkb(mp);
	8   freeb(mp);
	9   return(nmp);
       10  }

SEE ALSO
       linkb(9F)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.10							    11 Apr 1991 						       unlinkb(9F)