/usr/include/astrometry/os-features.h is in astrometry.net 0.46-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of the Astrometry.net suite.
Copyright 2008, 2010, 2012 Dustin Lang.
The Astrometry.net suite 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, version 2.
The Astrometry.net suite 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 the Astrometry.net suite ; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef OS_FEATURES_H
#define OS_FEATURES_H
#ifndef DONT_INCLUDE_OS_FEATURES_CONFIG_H
#include "os-features-config.h"
#endif
// Features we use that aren't standard across all supported platforms
char* canonicalize_file_name(const char* fn);
// This is actually in POSIX1b but may or may not be available.
int fdatasync(int fd);
/**
The qsort_r story:
-qsort_r appears in BSD (including Mac OSX)
void qsort_r(void *, size_t, size_t,
void *,
int (*)(void *, const void *, const void *));
-qsort_r appears in glibc 2.8, but with a different argument order:
void qsort_r(void*, size_t, size_t,
int (*)(const void*, const void*, void*),
void*);
Notice that the "thunk" and "comparison function" arguments to qsort_r are
swapped, and the "thunk" appears either at the beginning or end of the comparison
function.
We check a few things:
-is qsort_r declared?
-does qsort_r exist?
-do we need to swap the arguments?
Those using qsort_r in Astrometry.net should instead use the macro QSORT_R()
to take advantage of these tests.
Its signature is:
void QSORT_R(void* base, size_t nmembers, size_t member_size,
void* token, comparison_function);
You should define the "comparison" function like this:
static int QSORT_COMPARISON_FUNCTION(my_comparison, void* token, const void* v1, const void* v2) {
...
}
Distributions including glibc 2.8 include:
-Mandriva 2009
-Ubuntu 8.10
*/
#if NEED_DECLARE_QSORT_R
//// NOTE: this declaration must match os-features-test.c .
void qsort_r(void *base, size_t nmemb, size_t sz,
void *userdata,
int (*compar)(void *, const void *, const void *));
#endif
#if NEED_SWAP_QSORT_R
#define QSORT_R(a,b,c,d,e) qsort_r(a,b,c,e,d)
#define QSORT_COMPARISON_FUNCTION(func, thunk, v1, v2) func(v1, v2, thunk)
#else
#define QSORT_R qsort_r
#define QSORT_COMPARISON_FUNCTION(func, thunk, v1, v2) func(thunk, v1, v2)
#endif
// As suggested in http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Function-Names.html
#if __STDC_VERSION__ < 199901L
# if __GNUC__ >= 2
# define __func__ __FUNCTION__
# else
# define __func__ "<unknown>"
# endif
#endif
#endif
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