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