1 /* 2 * Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org> 3 * Copyright (c) 2014 The FreeBSD Foundation. 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Konstantin Belousov 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Neither the name of the author nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/signal.h> 36 #include <sys/ucontext.h> 37 #include <errno.h> 38 #include <stddef.h> 39 #include "libc_private.h" 40 41 __weak_reference(__sys_swapcontext, __swapcontext); 42 __sym_compat(swapcontext, __impl_swapcontext, FBSD_1.0); 43 __weak_reference(swapcontext, __impl_swapcontext); 44 __sym_default(swapcontext, swapcontext, FBSD_1.2); 45 46 #pragma weak swapcontext 47 int 48 swapcontext(ucontext_t *oucp, const ucontext_t *ucp) 49 { 50 51 return (((int (*)(ucontext_t *, const ucontext_t *)) 52 __libc_interposing[INTERPOS_swapcontext])(oucp, ucp)); 53 } 54