MIOCPULLUP(9F) Kernel Functions for Drivers MIOCPULLUP(9F)
miocpullup - Prepare the payload of an M_IOCTL message for access
#include <sys/stream.h>
#include <sys/strsun.h>
int miocpullup(mblk_t *mp, size_t size);
illumos DDI specific (illumos DDI).
mp
M_IOCTL message.
size
Number of bytes to prepare.
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.
Zero is returned on success. Otherwise an errno value is returned
indicating the problem.
This function can be called from user, kernel or interrupt context.
STREAMS Programming Guide
June 9, 2004 MIOCPULLUP(9F)
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
illumos DDI specific (illumos 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
June 9, 2004 MIOCPULLUP(9F)