1 /* Copyright (C) 2001-2022 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library; if not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #include <ucontext.h>
19 
20 struct rv
21   {
22     long retval;
23     long first_return;
24   };
25 
26 extern struct rv __getcontext (ucontext_t *__ucp) __THROW;
27 extern int __setcontext (const ucontext_t *__ucp) __THROW;
28 
29 int
__swapcontext(ucontext_t * oucp,const ucontext_t * ucp)30 __swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
31 {
32   struct rv rv = __getcontext (oucp);
33   if (rv.first_return)
34     __setcontext (ucp);
35   return 0;
36 }
37 
38 weak_alias (__swapcontext, swapcontext)
39