From e0023883c6d2e6745a19e4b48e186ed156c1fca8 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:19:27 +0200 Subject: Adding upstream version 2.11.2. Signed-off-by: Daniel Baumann --- gl/lib/sig-handler.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 gl/lib/sig-handler.h (limited to 'gl/lib/sig-handler.h') diff --git a/gl/lib/sig-handler.h b/gl/lib/sig-handler.h new file mode 100644 index 0000000..1ca8d54 --- /dev/null +++ b/gl/lib/sig-handler.h @@ -0,0 +1,51 @@ +/* Convenience declarations when working with . + + Copyright (C) 2008-2022 Free Software Foundation, Inc. + + This file 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. + + This file 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 this program. If not, see . */ + +#ifndef _GL_SIG_HANDLER_H +#define _GL_SIG_HANDLER_H + +#include + +#ifndef _GL_INLINE_HEADER_BEGIN + #error "Please include config.h first." +#endif +_GL_INLINE_HEADER_BEGIN +#ifndef SIG_HANDLER_INLINE +# define SIG_HANDLER_INLINE _GL_INLINE +#endif + +/* Convenience type when working with signal handlers. */ +typedef void (*sa_handler_t) (int); + +/* Return the handler of a signal, as a sa_handler_t value regardless + of its true type. The resulting function can be compared to + special values like SIG_IGN but it is not portable to call it. */ +SIG_HANDLER_INLINE sa_handler_t _GL_ATTRIBUTE_PURE +get_handler (struct sigaction const *a) +{ + /* POSIX says that special values like SIG_IGN can only occur when + action.sa_flags does not contain SA_SIGINFO. But in Linux 2.4, + for example, sa_sigaction and sa_handler are aliases and a signal + is ignored if sa_sigaction (after casting) equals SIG_IGN. In + this case, this implementation relies on the fact that the two + are aliases, and simply returns sa_handler. */ + return a->sa_handler; +} + +_GL_INLINE_HEADER_END + +#endif /* _GL_SIG_HANDLER_H */ -- cgit v1.2.3