b66b8326e5
functions are defined in SUSv2 and the latest POSIX spec. Thanks to Bernd Walter <ticso@cicely8.cicely.de> for helping debug my alpha assembly. Approved by: -arch
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*
|
|
* Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <ucontext.h>
|
|
|
|
__weak_reference(__swapcontext, swapcontext);
|
|
|
|
int
|
|
__swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
|
|
{
|
|
volatile int swapped;
|
|
int ret;
|
|
|
|
if (oucp == NULL || ucp == NULL) {
|
|
errno = EINVAL;
|
|
ret = -1;
|
|
}
|
|
else {
|
|
swapped = 0;
|
|
if ((ret = getcontext(oucp) == 0) && (swapped == 0)) {
|
|
swapped = 1;
|
|
ret = setcontext(ucp);
|
|
}
|
|
}
|
|
return (ret);
|
|
}
|