Content-type: text/html Man page of unlinkb

unlinkb

Section: Kernel Functions for Drivers (9F)
Updated: 16 Jan 2006
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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

The unlinkb() function 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, the unlinkb() function 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

The unlinkb() function can be called from user, interrupt, or kernel 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


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
EXAMPLES
SEE ALSO

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Time: 02:39:42 GMT, October 02, 2010