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Append an IPv6 hop-by-hop or destination option to an ancillary data object
#include <netinet/in.h>
int inet6_option_append(struct cmsghdr *cmsg,
const u_int8_t *typep,
int multx,
int plusy);
- cmsg
- A pointer to the cmsghdr
structure that must have been initialized by inet6_option_init().
- typep
- A pointer to the 8-bit option type. It's assumed
that this field is immediately followed by the 8-bit option data length field,
which is then followed by the option data.
You must initialize these three fields (the type-length-value, or TLV)
before calling this function.
The option type must have a value from 2 to 255, inclusive.
(0 and 1 are reserved for the Pad1 and PadN
options, respectively.)
The option data length must be between 0 and 255, inclusive,
and is the length of the option data that follows.
- multx
- The value x in the alignment term
xn + y.
It must have a value of 1, 2, 4, or 8.
- plusy
- The value y in the alignment term
xn + y.
It must have a value between 0 and 7, inclusive.
libsocket
Use the -l socket option to
qcc
to link against this library.
This inet6_option_append() function appends a hop-by-hop option or a
destination option to an ancillary data object that has been initialized by
inet6_option_init().
- 0
- Success.
- -1
- An error has occurred.
RFC 2292
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
inet6_option_alloc(),
inet6_option_find(),
inet6_option_init(),
inet6_option_next(),
inet6_option_space()
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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