miocpullup(9f)

1miocpullup(9F)           Kernel Functions for Drivers           miocpullup(9F)
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NAME

6       miocpullup - Prepare the payload of an M_IOCTL message for access
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SYNOPSIS

9       #include <sys/stream.h>
10       #include <sys/strsun.h>
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14       int miocpullup(mblk_t *mp, size_t size);
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INTERFACE LEVEL

18       Solaris DDI specific (Solaris DDI).
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PARAMETERS

21       mp      M_IOCTL message.
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24       size    Number of bytes to prepare.
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DESCRIPTION

28       The miocpullup() function prepares the payload of the specified M_IOCTL
29       message for access by ensuring that it consists of at least size  bytes
30       of data.
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33       If  the  M_IOCTL  message  is transparent, or its total payload is less
34       than size bytes, an error is returned.  Otherwise, the payload is  con‐
35       catenated  as  necessary  to provide contiguous access to at least size
36       bytes of data. As a special case, if size is zero, miocpullup() returns
37       successfully, even if no payload exists.
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RETURN VALUES

40       Zero is returned on success. Otherwise an errno value is returned indi‐
41       cating the problem.
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CONTEXT

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