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inet6_rth_init(3)					     inet6_rth_init(3)

NAME
       inet6_rth_init - Initialize an IPv6 Routing header buffer

SYNOPSIS
       #include <netinet/ip6.h>

       void inet6_rth_init(
	       void *bp,
	       int bp_len,
	       int type,
	       int segments );

LIBRARY
       Standard C Library (libc)

PARAMETERS
       Points  to  a buffer that is to contain an IPv6 Routing header.	Speci‐
       fies the length, in bytes, of the buffer.  Specifies the type of	 Rout‐
       ing  header.  The  valid	 value	is  IPV6_RTHDR_TYPE_0 for IPv6 Routing
       header type 0.  Specifies the number of segments or addresses that  are
       to  be  included	 in  the Routing header.  The valid value is from 0 to
       127, inclusive.

DESCRIPTION
       The inet6_rth_init() function initializes a buffer and buffer data  for
       an IPv6 Routing header. The function sets the ip60r_segleft, ip6r0_nxt,
       and ip6r0_reserved members in the ip6_rthdr0 structure to zero (0).  In
       addition,  it sets the ip6r0_type member to type and sets the ip6r0_len
       member based in the segments parameter. (See RFC 2460 for a description
       of   the	  actual  value.)  The	ip6_rthdr0  structure  is  defined  in
       netinet/ip6.h.

       The application must allocate the  buffer.  Use	the  inet6_rth_space()
       function to determine the buffer size.

       Use  the	 returned pointer as the first argument to the inet6_rth_add()
       function.

RETURN VALUES
       Upon successful completion, the	inet6_rth_init()  function  returns  a
       pointer	to  the	 buffer that is to contain the Routing header.	If the
       type is not supported, the bp is a null, or the	number	of  bp_len  is
       invalid, the function returns a NULL pointer.

SEE ALSO
       Functions:	     inet6_rth_add(3),		 inet6_rth_getaddr(3),
       inet6_rth_reverse(3), inet6_rth_segments(3), inet6_rth_space(3).

       Network Programmer's Guide

							     inet6_rth_init(3)
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