src/ucontext/generic/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
  25 #define _XOPEN_SOURCE 600L
  26 #include <ucontext.h>
  27 #include <errno.h>
  28
  29 #if defined(__x86_64__) || defined(__i386__)
  30
  31 #include <stddef.h>
  32 #include <signal.h>
  33
  34 extern int _setcontext(const void *);
  35
  36 int
  37 setcontext(const ucontext_t *uctx)
  38 {
  39         mcontext_t mctx = (mcontext_t)&uctx->__mcontext_data;
  40         ucontext_t *_uctx = (ucontext_t *)uctx;
  41         if (mctx != _uctx->uc_mcontext)
  42                 _uctx->uc_mcontext = mctx;
  43         sigprocmask(SIG_SETMASK, &uctx->uc_sigmask, NULL);
  44
  45 #if defined(__x86_64__)
  46         return _setcontext(mctx);
  47 #else
  48         return _setcontext(uctx);
  49 #endif
  50 }
  51
  52 #else
  53
  54 int
  55 setcontext(const ucontext_t *uctx)
  56 {
  57         errno = ENOTSUP;
  58         return -1;
  59 }
  60
  61 #endif