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annotate lib/sig-handler.h @ 17409:26a04e61f560

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stdio: use __REDIRECT for fwrite, fwrite_unlocked * lib/stdio.in.h (fwrite): When working around bug 11959, use __REDIRECT rather than '#define fwrite(...) ... fwrite (...) ...'. This is a more-targeted way to fix the -Wunused-value issue with clang, and it works with GCC too. Problem with targeting reported by Eric Blake in <http://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00067.html>. (fwrite_unlocked): Treat like fwrite. I ran into this issue while debugging the fwrite issue.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 15 May 2013 15:52:42 -0700
parents e542fd46ad6f
children
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1 /* Convenience declarations when working with <signal.h>.
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2
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3 Copyright (C) 2008-2013 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 _GL_INLINE_HEADER_BEGIN
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24 #ifndef SIG_HANDLER_INLINE
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25 # define SIG_HANDLER_INLINE _GL_INLINE
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26 #endif
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27
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28 /* Convenience type when working with signal handlers. */
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29 typedef void (*sa_handler_t) (int);
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30
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31 /* Return the handler of a signal, as a sa_handler_t value regardless
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32 of its true type. The resulting function can be compared to
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33 special values like SIG_IGN but it is not portable to call it. */
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34 SIG_HANDLER_INLINE sa_handler_t
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35 get_handler (struct sigaction const *a)
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36 {
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37 #ifdef SA_SIGINFO
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38 /* POSIX says that special values like SIG_IGN can only occur when
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39 action.sa_flags does not contain SA_SIGINFO. But in Linux 2.4,
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40 for example, sa_sigaction and sa_handler are aliases and a signal
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41 is ignored if sa_sigaction (after casting) equals SIG_IGN. So
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42 use (and cast) sa_sigaction in that case. */
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43 if (a->sa_flags & SA_SIGINFO)
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44 return (sa_handler_t) a->sa_sigaction;
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45 #endif
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46 return a->sa_handler;
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47 }
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48
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49 _GL_INLINE_HEADER_END
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50
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51 #endif /* _GL_SIG_HANDLER_H */