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Kernel Functions for Drivers

unlinkb(9F)

INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
EXAMPLES
SEE ALSO

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 }