inet6_rthdr_getflags()

Get the flags for a segment in an IPv6 routing header

Synopsis:

#include <netinet/in.h>

int inet6_rthdr_getflags(const struct cmsghdr *cmsg, 
                         int index);

Arguments:

cmsg
A pointer to the Ancillary data containing the routing header.
index
A value between 0 and the number returned by inet6_rthdr_segments().

Library:

libsocket

Use the -l socket option to qcc to link against this library.

Description:

This function returns the flags for the segment specified by index in the routing header described by cmsg. The index must have a value between 0 and the number returned by inet6_rthdr_segments().

Addresses are indexed starting at 1, and flags starting at 0. They're consistent with the terminology and figures in RFC2460.

Based on:

  • W. Stevens and M. Thomas, Advanced Sockets API for IPv6, RFC 2292, February 1998. Contains good examples.
  • S. Deering and R. Hinden, Internet Protocol, Version 6 (IPv6) Specification, RFC 2460, December 1998.

Returns:

  • IPV6_RTHDR_LOOSE or IPV6_RTHDR_STRICT for an IPv6 Type 0 routing header

  • -1 on error.

Classification:

RFC 2292

Safety:  
Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes

Last modified: 2013-12-23

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