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/* Copyright (C) 1997-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* System V ABI compliant user-level context switching support. */ #ifndef _UCONTEXT_H #define _UCONTEXT_H 1 #include <features.h> /* Get definition of __INDIRECT_RETURN. */ #include <bits/indirect-return.h> /* Get machine dependent definition of data structures. */ #include <sys/ucontext.h> __BEGIN_DECLS /* Get user context and store it in variable pointed to by UCP. */ extern int getcontext (ucontext_t *__ucp) __THROWNL; /* Set user context from information of variable pointed to by UCP. */ extern int setcontext (const ucontext_t *__ucp) __THROWNL; /* Save current context in context variable pointed to by OUCP and set context from variable pointed to by UCP. */ extern int swapcontext (ucontext_t *__restrict __oucp, const ucontext_t *__restrict __ucp) __THROWNL __INDIRECT_RETURN; /* Manipulate user context UCP to continue with calling functions FUNC and the ARGC-1 parameters following ARGC when the context is used the next time in `setcontext' or `swapcontext'. We cannot say anything about the parameters FUNC takes; `void' is as good as any other choice. */ extern void makecontext (ucontext_t *__ucp, void (*__func) (void), int __argc, ...) __THROW; __END_DECLS #endif /* ucontext.h */