msgdsize(9F) Kernel Functions for Drivers msgdsize(9F)NAME
msgdsize - return the number of bytes in a message
SYNOPSIS
#include <sys/stream.h>
size_t msgdsize(mblk_t *mp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
mp Message to be evaluated.
DESCRIPTION
msgdsize() counts the number of bytes in a data message. Only bytes included in the data blocks of type M_DATA are included in the count.
RETURN VALUES
The number of data bytes in a message, expressed as an integer.
CONTEXT
msgdsize() can be called from user or interrupt context.
EXAMPLES
See bufcall(9F) for an example that uses msgdsize().
SEE ALSO bufcall(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 11 Nov 1996 msgdsize(9F)
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msgpullup(9F) Kernel Functions for Drivers msgpullup(9F)NAME
msgpullup - concatenate bytes in a message
SYNOPSIS
#include <sys/stream.h>
mblk_t *msgpullup(mblk_t *mp, ssize_t len);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
mp Pointer to the message whose blocks are to be concatenated.
len Number of bytes to concatenate.
DESCRIPTION
msgpullup() 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.
RETURN VALUES
msgpullup returns the following values:
Non-null Successful completion. A pointer to the new message is returned.
NULL An error occurred.
CONTEXT
msgpullup() can be called from user or interrupt context.
SEE ALSO srv(9E), allocb(9F), pullupmsg(9F), msgb(9S)
Writing Device Drivers
STREAMS Programming Guide
NOTES
msgpullup() is a DKI-compliant replacement for the older pullupmsg(9F) routine. Users are strongly encouraged to use msgpullup() instead of
pullupmsg(9F).
SunOS 5.10 11 Nov 1996 msgpullup(9F)