NAME

inet6_opt_init − Return the length of an IPv6 extension header with no options and initialize the header

SYNOPSIS

#include <netinet/ip6.h>
int inet6_opt_init(
        void ∗extbuf,
        size_t extlen );

LIBRARY

Standard C Library (libc)

PARAMETERS

extbuf
Points to a buffer that contains an extension header. This is either a valid pointer or a NULL pointer.

extlen
Specifies the length of the extension header to initialize. Valid values are 0 and any number that is a multiple of 8.

DESCRIPTION

The inet6_opt_init() function when called with extbuf as a NULL pointer and extlen as 0, returns the number of bytes in an extension header that has no options. 

If you specify extbuf as a valid pointer and extlen as a number that is a multiple of 8, the function returns the same information as in the previous case, initializes the extension header, and sets the length field. 

RETURN VALUES

Upon successful completion, the inet6_opt_init() function returns the number of bytes in an extension header with no options.  Upon failure, it returns a -1. 

SEE ALSO

Functions: inet6_opt_append(3), inet6_opt_find(3), inet6_opt_finish(3), inet6_opt_get_val(3), inet6_opt_next(3), inet6_opt_set_val(3). 

Network Programmer’s Guide