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

6       msgdsize - return the number of bytes in a message
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SYNOPSIS

9       #include <sys/stream.h>
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13       size_t msgdsize(mblk_t *mp);
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INTERFACE LEVEL

17       Architecture independent level 1 (DDI/DKI).
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PARAMETERS

20       mp    Message to be evaluated.
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DESCRIPTION

24       The  msgdsize()  function counts the number of bytes in a data message.
25       Only bytes included in the data blocks of type M_DATA are  included  in
26       the count.
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RETURN VALUES

29       The number of data bytes in a message, expressed as an integer.
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CONTEXT

32       The  msgdsize()  function can be called from user, interrupt, or kernel
33       context.
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EXAMPLES

36       See bufcall(9F) for an example that uses msgdsize().
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SEE ALSO

39       bufcall(9F)
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42       Writing Device Drivers
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45       STREAMS Programming Guide
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49SunOS 5.11                        16 Jan 2006                     msgdsize(9F)