dupb man page on DigitalUNIX

dupb man page on DigitalUNIX

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dupb(9r)							      dupb(9r)

NAME
       dupb - STREAMS: Duplicates a message block descriptor

SYNOPSIS
       #include <sys/stream.h>

       MBLKP dupb(
	       MBLKP message_block_ptr );

ARGUMENTS
       Specifies a pointer to the message block to be duplicated.  The typedef
       MBLKP is an alternate name for typedef struct msgb *.

DESCRIPTION
       The dupb interface creates a new message block structure	 to  reference
       the  message block pointed to by the message_block_ptr argument. Unlike
       copyb, the dupb interface does not copy the  information	 in  the  data
       block,  but  creates  a	new  structure to point to it. The new message
       block structure contains the same  information  as  the	first  message
       block structure.

RETURN VALUES
       Upon successful completion, the dupb interface returns a pointer to the
       newly allocated message block.  This newly allocated message  block  is
       of  type	 struct	 msgb  *.  The	msgb  data structure is defined in the
       /usr/sys/include/sys/stream.h file.

       Otherwise, dupb returns a NULL pointer.

SEE ALSO
       Kernel Interfaces: copyb(9r)

       Programmer's Guide: STREAMS

								      dupb(9r)

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