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copyb(9r)							     copyb(9r)

NAME
       copyb - STREAMS: Copies a message block

SYNOPSIS
       #include <sys/stream.h>

       MBLKP copyb(
	       MBLKP message_block );

ARGUMENTS
       Specifies  a  pointer  to the message block from which copyb copies the
       data. The typedef MBLKP is an alternate name for typedef struct msgb *.

DESCRIPTION
       The copyb interface allocates a new message block and  copies  into  it
       the  data  from	the  block  pointed  to by the message block (the mes‐
       sage_block argument). The new message block is at least as large as the
       message	block  being  copied.  The copyb interface uses the b_rptr and
       b_wptr members of the msgb structure  pointer  to  determine  how  many
       bytes to copy.

RETURN VALUES
       Upon  successful	 completion,  the copyb interface returns a pointer to
       the newly allocated message block that contains the copied data.	  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, copyb returns a NULL pointer.

SEE ALSO
       Kernel Interfaces: allocb(9r)

       Programmer's Guide: STREAMS

								     copyb(9r)

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