inet6_opt_finish man page on DigitalUNIX

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inet6_opt_finish(3)					   inet6_opt_finish(3)

       inet6_opt_finish - Return the total length of an IPv6 extension header,
       including padding, and initialize the option

       #include <netinet/ip6.h>

       int inet6_opt_finish(
	       void *extbuf,
	       size_t extlen,
	       int prevlen );

       Standard C Library (libc)

       Points to a buffer that contains an extension header. This is either  a
       valid pointer or a NULL pointer.	 Specifies the length of the extension
       header to finish initializing. A valid value is any number greater than
       or  equal to 0.	Specifies the length of the existing extension header.
       Obtain  this  value  from  a  prior   call   to	 inet6_opt_init()   or

       The  inet6_opt_finish()	function  when	called	with  extbuf as a NULL
       pointer and extlen as 0, returns the total number of bytes in an exten‐
       sion header, including final padding.

       If  you specify extbuf as a valid pointer and a valid extlen parameter,
       the function returns the same information  as  in  the  previous	 case,
       increments  the	buffer	pointer, and verifies that the buffer is large
       enough to hold the header.

       Upon successful completion, the inet6_opt_finish() function returns the
       total  number  of bytes in an extension header, including padding. Upon
       failure, it returns a -1.

       Functions:	    inet6_opt_append(3),	    inet6_opt_find(3),
       inet6_opt_get_val(3),	   inet6_opt_init(3),	    inet6_opt_next(3),

       Network Programmer's Guide


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