x86_64/gen/setcontext.c

   1 /*
   2  * Copyright (c) 2007, 2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #if defined(__x86_64__)
  25
  26 #define _XOPEN_SOURCE 600L
  27 #include <ucontext.h>
  28 #undef _ANSI_SOURCE
  29 #include <signal.h>
  30
  31 extern int _setcontext(const mcontext_t);
  32
  33 int
  34 setcontext(const ucontext_t *uctx)
  35 {
  36         mcontext_t mctx = (mcontext_t)&uctx->__mcontext_data;
  37         ucontext_t *_uctx = (ucontext_t *)uctx;
  38         if (mctx != _uctx->uc_mcontext)
  39                 _uctx->uc_mcontext = mctx;
  40         sigsetmask(uctx->uc_sigmask);
  41         return _setcontext(mctx);
  42 }
  43
  44 #endif /* __x86_64__ */