dupmsg(9F) Kernel Functions for Drivers dupmsg(9F)NAME
dupmsg - duplicate a message
SYNOPSIS
#include <sys/stream.h>
mblk_t *dupmsg(mblk_t *mp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
mp Pointer to the message.
DESCRIPTION
dupmsg() forms a new message by copying the message block descriptors pointed to by mp and linking them. dupb(9F) is called for each mes-
sage block. The data blocks themselves are not duplicated.
RETURN VALUES
If successful, dupmsg() returns a pointer to the new message block. Otherwise, it returns a NULL pointer. A return value of NULL indi-
cates either memory depletion or the data block reference count, db_ref (see datab(9S)), has reached a limit(255). See dupb(9F).
CONTEXT
dupmsg() can be called from user, kernel, or interrupt context.
EXAMPLES
Example 1 Using dupmsg()
See copyb(9F) for an example using dupmsg().
SEE ALSO copyb(9F), copymsg(9F), dupb(9F), datab(9S)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.11 11 Apr 1991 dupmsg(9F)
Check Out this Related Man Page
dupmsg(9F) Kernel Functions for Drivers dupmsg(9F)NAME
dupmsg - duplicate a message
SYNOPSIS
#include <sys/stream.h>
mblk_t *dupmsg(mblk_t *mp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
mp Pointer to the message.
DESCRIPTION
dupmsg() forms a new message by copying the message block descriptors pointed to by mp and linking them. dupb(9F) is called for each mes-
sage block. The data blocks themselves are not duplicated.
RETURN VALUES
If successful, dupmsg() returns a pointer to the new message block. Otherwise, it returns a NULL pointer. A return value of NULL indi-
cates either memory depletion or the data block reference count, db_ref (see datab(9S)), has reached a limit(255). See dupb(9F).
CONTEXT
dupmsg() can be called from user, kernel, or interrupt context.
EXAMPLES
Example 1: Using dupmsg()
See copyb(9F) for an example using dupmsg().
SEE ALSO copyb(9F), copymsg(9F), dupb(9F), datab(9S)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 11 Apr 1991 dupmsg(9F)
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