peeloff.c

SCTP 协议实现源代码

/* SCTP kernel Implementation: User API extensions.
 *
 * peeloff.c
 *
 * Distributed under the terms of the LGPL v2.1 as described in
 *    http://www.gnu.org/copyleft/lesser.txt 
 *
 * This file is part of the user library that offers support for the
 * SCTP kernel Implementation. The main purpose of this
 * code is to provide the SCTP Socket API mappings for user
 * application to interface with the SCTP in kernel.
 *
 * This implementation is based on the Socket API Extensions for SCTP
 * defined in <draft-ietf-tsvwg-sctpsocket-10.txt.
 *
 * (C) Copyright IBM Corp. 2001, 2003
 * 
 * Written or modified by: 
 *  Sridhar Samudrala     <[e-mail]>
 */

#include <sys/socket.h>   /* struct sockaddr_storage, setsockopt() */
#include <netinet/sctp.h> /* SCTP_SOCKOPT_BINDX_* */
#include <errno.h>

/* Branch off an association into a seperate socket.  This is a new SCTP API
 * described in the section 8.2 of the Sockets API Extensions for SCTP. 
 * This is implemented using the getsockopt() interface.
 */  
int
sctp_peeloff(int fd, sctp_assoc_t associd)
{
	sctp_peeloff_arg_t peeloff;
	socklen_t peeloff_size = sizeof(peeloff);
	int err;

	peeloff.associd = associd;
	peeloff.sd = 0;
	err = getsockopt(fd, SOL_SCTP, SCTP_SOCKOPT_PEELOFF, &peeloff, 
			 &peeloff_size); 
	if (err < 0) {
		return err;
	}

	return peeloff.sd;

} /* sctp_peeloff() */