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

NAME

       merror - Send an M_ERROR message upstream

SYNOPSIS

       #include <sys/stream.h>
       #include <sys/strsun.h>

       void merror(queue_t *wq, mblk_t *mp, int error);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       wq	       Write queue associated with the read queue to send the M_ERROR on.

       mp	       Optionally, a STREAMS message to convert to an M_ERROR.

       error	       Error code to include in the M_ERROR message.

DESCRIPTION

       The merror() function constructs an M_ERROR message, and sends the resulting message upstream.

       If  mp  is NULL, merror() allocates a one-byte M_ERROR message. If mp is non-NULL, merror() attempts to convert the passed-in message to an
       M_ERROR. However, if the passed-in message has more than one reference (see dupmsg(9F)), or if it is of zero length, it is freed and a  new
       message is allocated.

       If  the	allocation  or	conversion  fails, merror() silently fails. Otherwise, the resulting one-byte data block is assigned the specified
       error code and sent upstream.

RETURN VALUES

       None.

CONTEXT

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

NOTES

       Callers must not hold any locks across an merror() that can be acquired as part of put(9E) processing.

SEE ALSO

       put(9E), dupmsg(9F)

       STREAMS Programming Guide

SunOS 5.10							    9 June 2004 							merror(9F)