52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
|
/* Convenience declarations when working with <signal.h>.
|
||
|
|
|
||
|
|
Copyright (C) 2008-2023 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 <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#ifndef _GL_SIG_HANDLER_H
|
||
|
|
#define _GL_SIG_HANDLER_H
|
||
|
|
|
||
|
|
#include <signal.h>
|
||
|
|
|
||
|
|
#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 */
|