/usr/include/astrometry/os-features.h is in libastrometry-dev 0.70+dfsg-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 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | /*
# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
#ifndef OS_FEATURES_H
#define OS_FEATURES_H
#ifndef DONT_INCLUDE_OS_FEATURES_CONFIG_H
#include "astrometry/os-features-config.h"
#endif
// Features we use that aren't standard across all supported platforms
#if defined(NEED_CANONICALIZE_FILE_NAME) && (NEED_CANONICALIZE_FILE_NAME == 0)
// don't redeclare it!
#else
char* canonicalize_file_name(const char* fn);
#endif
// This is actually in POSIX1b but may or may not be available.
int fdatasync(int fd);
// Not POSIX; doesn't exist in Solaris 10
#include <sys/param.h>
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#ifndef MAX
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif
// isfinite() on Solaris; from
// https://code.google.com/p/redis/issues/detail?id=20
#if defined(__sun) && defined(__GNUC__)
#undef isnan
#define isnan(x) \
__extension__({ __typeof (x) __x_a = (x); \
__builtin_expect(__x_a != __x_a, 0); })
#undef isfinite
#define isfinite(x) \
__extension__ ({ __typeof (x) __x_f = (x); \
__builtin_expect(!isnan(__x_f - __x_f), 1); })
#undef isinf
#define isinf(x) \
__extension__ ({ __typeof (x) __x_i = (x); \
__builtin_expect(!isnan(__x_i) && !isfinite(__x_i), 0); })
#undef isnormal
#define isnormal(x) \
__extension__ ({ __typeof(x) __x_n = (x); \
if (__x_n < 0.0) __x_n = -__x_n; \
__builtin_expect(isfinite(__x_n) \
&& (sizeof(__x_n) == sizeof(float) \
? __x_n >= __FLT_MIN__ \
: sizeof(__x_n) == sizeof(long double) \
? __x_n >= __LDBL_MIN__ \
: __x_n >= __DBL_MIN__), 1); })
#undef HUGE_VALF
#define HUGE_VALF (1e50f)
#endif
/**
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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