/usr/include/libexplain/warn_unused_result.h is in libexplain-dev 0.52.D002-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | /*
* libexplain - Explain errno values returned by libc functions
* Copyright (C) 2008, 2009 Peter Miller
* Written by Peter Miller <pmiller@opensource.org.au>
*
* This program 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 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
* 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 <http://www.gnu.org/licenses/>.
*/
#ifndef LIBEXPLAIN_WARN_UNUSED_RESULT_H
#define LIBEXPLAIN_WARN_UNUSED_RESULT_H
/*
* Convenience macros to test the versions of glibc and gcc.
* Use them like this:
* #if __GNUC_PREREQ (2,8)
* ... code requiring gcc 2.8 or later ...
* #endif
* Note - they won't work for gcc1 or glibc1, since the _MINOR macros
* were not defined then. */
#if defined __GNUC__ && defined __GNUC_MINOR__
# define LIBEXPLAIN_GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define LIBEXPLAIN_GNUC_PREREQ(maj, min) 0
#endif
/*
* We attach this attribute to functions that should never have their
* return value ignored. Amongst other things, this can detect the case
* where the client has called explain_fubar when they meant to call
* explain_fubar_or_die instead.
*/
#if LIBEXPLAIN_GNUC_PREREQ(3, 4)
#define LIBEXPLAIN_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
#else
#define LIBEXPLAIN_WARN_UNUSED_RESULT
#endif
#endif /* LIBEXPLAIN_WARN_UNUSED_RESULT_H */
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