man/man9f/miocpullup.9f

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 miocpullup 9F "9 June 2004" "SunOS 5.11" "Kernel Functions for Drivers"
 NAME
miocpullup - Prepare the payload of an M_IOCTL message for access
 SYNOPSIS

#include <sys/stream.h>
#include <sys/strsun.h>


int miocpullup(mblk_t *mp, size_t size);


 INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).
 PARAMETERS

mp

M_IOCTL message.


size

Number of bytes to prepare.


 DESCRIPTION

The miocpullup() function prepares the payload of the specified M_IOCTL
message for access by ensuring that it consists of at least size bytes of
data.

If the M_IOCTL message is transparent, or its total payload is less than
size bytes, an error is returned. Otherwise, the payload is concatenated
as necessary to provide contiguous access to at least size bytes of data.
As a special case, if size is zero, miocpullup() returns
successfully, even if no payload exists.
 RETURN VALUES

Zero is returned on success. Otherwise an errno value is returned indicating
the problem.
 CONTEXT

This function can be called from user, kernel or interrupt context.
 SEE ALSO

STREAMS Programming Guide