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/* Convenience declarations when working with <signal.h>.
Copyright (C) 2008-2011 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _GL_SIG_HANDLER_H
#define _GL_SIG_HANDLER_H
#include <signal.h>
/* 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. */
static inline sa_handler_t
get_handler (struct sigaction const *a)
{
#ifdef SA_SIGINFO
/* 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. So
use (and cast) sa_sigaction in that case. */
if (a->sa_flags & SA_SIGINFO)
return (sa_handler_t) a->sa_sigaction;
#endif
return a->sa_handler;
}
#endif /* _GL_SIG_HANDLER_H */
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