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

msgpullup - concatenate bytes in a message

#include <sys/stream.h>
mblk_t *msgpullup(mblk_t *mp, ssize_t len);

Architecture independent level 1 (DDI/DKI).

Pointer to the message whose blocks are to be concatenated.


Number of bytes to concatenate.

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.

The msgpullup function returns the following values:


Successful completion. A pointer to the new message is returned.


An error occurred.

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

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

Writing Device Drivers

STREAMS Programming Guide

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 OmniOS