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Find the next IPv6 hop-by-hop or destination option
#include <netinet/in.h>
int inet6_option_next(const struct cmsghdr *cmsg,
u_int8_t **tptrp);
- cmsg
- A pointer to the cmsghdr
structure that must have been initialized by inet6_option_init().
- tptrp
- A pointer to a pointer to an
8-bit byte.
libsocket
Use the -l socket option to
qcc
to link against this library.
This inet6_option_next() function finds the next hop-by-hop option or destination
option in an ancillary data object. If another option remains
to be processed, the return value of the function is 0
and *tptrp points to the 8-bit option type field the option data.
The cmsg variable is a pointer to cmsghdr
structure for which cmsg_level equals
IPPROTO_IPV6 and cmsg_type
equals either IPV6_HOPOPTS or IPV6_DSTOPTS.
The tptrp is a pointer to a pointer to an
8-bit byte and *tptrp is used by
the function to remember its place in the ancillary data object each time
the function is called. The first time you call this function for a
given ancillary data object, you must set *tptrp to NULL.
Each time this function returns success, *tptrp
points to the 8-bit option type field for the next option to be processed.
- 0
- The option is located and the *tptrp points to the 8-bit
option type field.
- -1 with *tptrp pointing to NULL
- No more options to process.
- -1 with *tptrp pointing to non-NULL
- An error has occurred.
RFC 2292
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
inet6_option_alloc(),
inet6_option_append(),
inet6_option_find(),
inet6_option_init(),
inet6_option_space()
Based on:
- W. Stevens and M. Thomas, Advanced Sockets API for IPv6,
RFC 2292, February 1998. Contains examples.
- S. Deering and R. Hinden, Internet Protocol, Version 6
(IPv6) Specification, RFC 2460, December 1998.
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