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msgsize(9f) [opensolaris man page]

msgsize(9F)						   Kernel Functions for Drivers 					       msgsize(9F)

msgsize - Return the total number of bytes in a message SYNOPSIS
#include <sys/stream.h> #include <sys/strsun.h> size_t msgsize(mblk_t *mp); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI) PARAMETERS
mp Message to be evaluated. DESCRIPTION
The msgsize() function counts the number of bytes in a message, regardless of the data type of the underlying data blocks. RETURN VALUES
Number of bytes in the message. CONTEXT
This function can be called from user, kernel or interrupt context. SEE ALSO
msgdsize(9F) STREAMS Programming Guide SunOS 5.11 9 June 2004 msgsize(9F)

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mexchange(9F)						   Kernel Functions for Drivers 					     mexchange(9F)

mexchange - Exchange one message for another SYNOPSIS
#include <sys/stream.h> #include <sys/strsun.h> mblk_t *mexchange(queue_t *wq, mblk_t *mp, size_t size, uchar_t type, int32_t primtype); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). PARAMETERS
wq Optionally, write queue associated with the read queue to be used on failure (see below). mp Optionally, the message to exchange. size Size of the returned message. type Type of the returned message. primtype Optionally, a 4 byte value to store at the beginning of the returned message. DESCRIPTION
The mexchange() function exchanges the passed in message for another message of the specified size and type. If mp is not NULL, is of at least size bytes, and has only one reference (see dupmsg(9F)), mp is converted to be of the specified size and type. Otherwise, a new message of the specified size and type is allocated. If allocation fails, and wq is not NULL, merror(9F) attempts to send an error to the stream head. Finally, if primtype is not -1 and size is at least 4 bytes, the first 4 bytes are assigned to be primtype. This is chiefly useful for STREAMS-based protocols such as DLPI and TPI which store the protocol message type in the first 4 bytes of each message. RETURN VALUES
A pointer to the requested message is returned on success. NULL is returned on failure. CONTEXT
This function can be called from user, kernel or interrupt context. SEE ALSO
dupmsg(9F), merror(9F) STREAMS Programming Guide SunOS 5.10 9 June 2004 mexchange(9F)
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