9.11
sctp_opt_info Function
The sctp_opt_info function is provided
for implementations that cannot use the getsockopt
functions for SCTP. This inability to use the getsockopt
function is because some of the SCTP socket options, for example,
SCTP_STATUS, need an in-out variable to pass the
association identification. For systems that cannot provide an
in-out variable to the getsockopt function, the user will
need to use sctp_opt_info. For systems like FreeBSD that
do allow in-out variables in the socket option call, the
sctp_opt_info call is a library call that repackages the
arguments into the appropriate getsockopt call. For
portability's sake, applications should use sctp_opt_info
for all the options that require in-out variables (Section
7.10).
The call has the following format:
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int sctp_opt_info(int sockfd, sctp_assoc_t assoc_id, int opt void *arg, socklen_t *siz);
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Returns: 0 for success, 鈥? on error
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sockfd is the
socket descriptor that the user would like the socket option to
affect. assoc_id is the
identification of the association (if any) on which the user is
performing the option. opt is the
socket option (as defined in Section 7.10) for
SCTP. arg is the socket option
argument, and siz is a pointer to
a socklen_t which holds the size
of the argument.
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