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NGATMBASE(4)		 BSD Kernel Interfaces Manual		  NGATMBASE(4)

     ngatmbase -- netgraph ATM utility module

     #include <netnatm/unimsg.h>
     #include <netgraph/atm/ngatmbase.h>

     struct mbuf *
     uni_msg_pack_mbuf(struct uni_msg *msg, void *hdr, size_t len);

     struct uni_msg *
     uni_msg_alloc(size_t len);

     struct uni_msg *
     uni_msg_build(void	*buf, ...);

     uni_msg_destroy(struct uni_msg *msg);

     uni_msg_unpack_mbuf(struct	mbuf *m, struct	uni_msg	*msgp);

     This module provides utility functions for	the handling of	signalling
     messages to the NgATM modules.

     The uni_msg_pack_mbuf() function packs a message into one or several
     mbufs optionally prepending a header.  The	header is given	by its address
     hdr and length len.  If hdr is NULL or len	equals 0, no header is
     prepended.	 Either	msg or hdr may be NULL but not both.  The
     uni_msg_pack_mbuf() function returns a pointer to the allocated mbuf
     chain or NULL in the case of an error.

     The uni_msg_alloc() function allocates a new message with space for at
     least len bytes.  In the case of an error NULL is returned.

     The uni_msg_build() function constructs a message from pieces.  Each
     piece is given by a pair of arguments, the	first of type void * and the
     second a size_t.  The list	of pieces must be terminated by	(void *)NULL.

     The uni_msg_destroy() function destroys the messages and frees all	the
     messages's	memory.

     The uni_msg_unpack_mbuf() function	unpacks	an mbuf	chain info a uni_msg.
     A pointer to the newly allocated message is stored	in msgp	and 0 is re-
     turned.  In the case of an	error (either when no packet header is found
     in	the first mbuf or memory cannot	be allocated) the function returns an
     appropriate error code.

     ng_ccatm(4), ng_sscfu(4), ng_sscop(4), ng_uni(4)

     Harti Brandt <>

BSD				August 24, 2004				   BSD


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