xref: /freebsd/lib/libc/sys/swapcontext.c (revision 6e83504c603157e9fc1660d2a1556036492662fc)

/*
 * Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org>
 * Copyright (c) 2014 The FreeBSD Foundation.
 * All rights reserved.
 *
 * Portions of this software were developed by Konstantin Belousov
 * under sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Neither the name of the author nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/signal.h>
#include <sys/ucontext.h>
#include <errno.h>
#include <stddef.h>
#include "libc_private.h"

__weak_reference(__sys_swapcontext, __swapcontext);
__sym_compat(swapcontext, __impl_swapcontext, FBSD_1.0);
__weak_reference(swapcontext, __impl_swapcontext);
__sym_default(swapcontext, swapcontext, FBSD_1.2);

#pragma weak swapcontext
int
swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
{
	return (INTERPOS_SYS(swapcontext, oucp, ucp));
}