inet6_rthdr_init()

Updated: October 26, 2022

Initialize an IPv6 routing header

Synopsis:

#include <netinet/in.h>

struct cmsghdr * inet6_rthdr_init(void *bp, 
                                  int type);

Arguments:

bp
A pointer to the buffer where the function can build a cmsghdr structure followed by a routing header of the specified type.
type
The type of IPv6 Routing header (e.g., Type 0 as defined in <netinet/in.h>).

Library:

libsocket

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

Description:

This function initializes the buffer pointed to by bp to contain a cmsghdr structure followed by a Routing header of the specified type. The cmsg_len member of the cmsghdr structure is initialized to the size of the structure plus the amount of space required by the Routing header.

The cmsg_level and cmsg_type members are also initialized as required.

You must allocate the buffer before calling this function. To determine the size of the buffer, call inet6_rthdr_space().

Based on:

Returns:

A pointer to the cmsghdr structure, which you'll pass to other functions (and used as the first argument to list functions), or NULL if an error occurred.

Classification:

RFC 2292

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