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

NAME

msgpullup - concatenate bytes in a message

SYNOPSIS

#include <sys/stream.h>


mblk_t *msgpullup(mblk_t *mp, ssize_t len);

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).

PARAMETERS

mp
Pointer to the message whose blocks are to be concatenated.


len
Number of bytes to concatenate.

DESCRIPTION

The msgpullup() function concatenates and aligns the first len data bytes
of the message pointed to by mp, copying the data into a new message. Any
remaining bytes in the remaining message blocks will be copied and linked
onto the new message. The original message is unaltered. If len equals
-1, all data are concatenated. If len bytes of the same message type
cannot be found, msgpullup() fails and returns NULL.

RETURN VALUES

The msgpullup function returns the following values:

Non-null
Successful completion. A pointer to the new message is
returned.


NULL
An error occurred.

CONTEXT

The msgpullup() function can be called from user, interrupt, or kernel
context.

SEE ALSO

srv(9E), allocb(9F), pullupmsg(9F), msgb(9S)


Writing Device Drivers


STREAMS Programming Guide

NOTES

The msgpullup() function is a DKI-compliant replacement for the older
pullupmsg(9F) routine. Users are strongly encouraged to use msgpullup()
instead of pullupmsg(9F).

January 16, 2006 MSGPULLUP(9F)