| 1 | /* Convenience declarations when working with <signal.h>.
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| 2 |
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| 3 | Copyright (C) 2008-2016 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #ifndef _GL_SIG_HANDLER_H
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| 19 | #define _GL_SIG_HANDLER_H
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| 20 |
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| 21 | #include <signal.h>
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| 22 |
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| 23 | #ifndef _GL_INLINE_HEADER_BEGIN
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| 24 | #error "Please include config.h first."
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| 25 | #endif
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| 26 | _GL_INLINE_HEADER_BEGIN
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| 27 | #ifndef SIG_HANDLER_INLINE
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| 28 | # define SIG_HANDLER_INLINE _GL_INLINE
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| 29 | #endif
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| 30 |
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| 31 | /* Convenience type when working with signal handlers. */
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| 32 | typedef void (*sa_handler_t) (int);
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| 33 |
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| 34 | /* Return the handler of a signal, as a sa_handler_t value regardless
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| 35 | of its true type. The resulting function can be compared to
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| 36 | special values like SIG_IGN but it is not portable to call it. */
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| 37 | SIG_HANDLER_INLINE sa_handler_t _GL_ATTRIBUTE_PURE
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| 38 | get_handler (struct sigaction const *a)
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| 39 | {
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| 40 | #ifdef SA_SIGINFO
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| 41 | /* POSIX says that special values like SIG_IGN can only occur when
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| 42 | action.sa_flags does not contain SA_SIGINFO. But in Linux 2.4,
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| 43 | for example, sa_sigaction and sa_handler are aliases and a signal
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| 44 | is ignored if sa_sigaction (after casting) equals SIG_IGN. So
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| 45 | use (and cast) sa_sigaction in that case. */
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| 46 | if (a->sa_flags & SA_SIGINFO)
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| 47 | return (sa_handler_t) a->sa_sigaction;
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| 48 | #endif
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| 49 | return a->sa_handler;
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| 50 | }
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| 51 |
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| 52 | _GL_INLINE_HEADER_END
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| 53 |
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| 54 | #endif /* _GL_SIG_HANDLER_H */
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