1 /* Substitute for <sys/random.h>.
2 Copyright (C) 2020-2023 Free Software Foundation, Inc.
3
4 This file is free software: you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
8
9 This file is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 # if __GNUC__ >= 3
18 @PRAGMA_SYSTEM_HEADER@
19 # endif
20 @PRAGMA_COLUMNS@
21
22 #ifndef _@GUARD_PREFIX@_SYS_RANDOM_H
23
24 #if @HAVE_SYS_RANDOM_H@
25
26 /* On uClibc < 1.0.35, <sys/random.h> assumes prior inclusion of <stddef.h>.
27 Do not use __UCLIBC__ here, as it might not be defined yet.
28 But avoid namespace pollution on glibc systems. */
29 # ifndef __GLIBC__
30 # include <stddef.h>
31 # endif
32 /* On Mac OS X 10.5, <sys/random.h> assumes prior inclusion of <sys/types.h>.
33 On Max OS X 10.13, <sys/random.h> assumes prior inclusion of a file that
34 includes <Availability.h>, such as <stdlib.h> or <unistd.h>. */
35 # if defined __APPLE__ && defined __MACH__ /* Mac OS X */
36 # include <sys/types.h>
37 # include <stdlib.h>
38 # endif
39
40 /* The include_next requires a split double-inclusion guard. */
41 # @INCLUDE_NEXT@ @NEXT_SYS_RANDOM_H@
42
43 #endif
44
45 #ifndef _@GUARD_PREFIX@_SYS_RANDOM_H
46 #define _@GUARD_PREFIX@_SYS_RANDOM_H
47
48 /* This file uses GNULIB_POSIXCHECK, HAVE_RAW_DECL_*. */
49 #if !_GL_CONFIG_H_INCLUDED
50 #error "Please include config.h first."
51 #endif
52
53 #include <sys/types.h>
54
55 /* Define the GRND_* constants. */
56 #ifndef GRND_NONBLOCK
57 # define GRND_NONBLOCK 1
58 # define GRND_RANDOM 2
59 #endif
60
61 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
62
63 /* The definition of _GL_ARG_NONNULL is copied here. */
64
65 /* The definition of _GL_WARN_ON_USE is copied here. */
66
67
68 /* Declare overridden functions. */
69
70
71 #if @GNULIB_GETRANDOM@
72 /* Fill a buffer with random bytes. */
73 # if @REPLACE_GETRANDOM@
74 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
75 # undef getrandom
76 # define getrandom rpl_getrandom
77 # endif
78 _GL_FUNCDECL_RPL (getrandom, ssize_t,
79 (void *buffer, size_t length, unsigned int flags)
80 _GL_ARG_NONNULL ((1)));
81 _GL_CXXALIAS_RPL (getrandom, ssize_t,
82 (void *buffer, size_t length, unsigned int flags));
83 # else
84 # if !@HAVE_GETRANDOM@
85 _GL_FUNCDECL_SYS (getrandom, ssize_t,
86 (void *buffer, size_t length, unsigned int flags)
87 _GL_ARG_NONNULL ((1)));
88 # endif
89 _GL_CXXALIAS_SYS (getrandom, ssize_t,
90 (void *buffer, size_t length, unsigned int flags));
91 # endif
92 # if __GLIBC__ + (__GLIBC_MINOR__ >= 25) > 2
93 _GL_CXXALIASWARN (getrandom);
94 # endif
95 #elif defined GNULIB_POSIXCHECK
96 # undef getrandom
97 # if HAVE_RAW_DECL_GETRANDOM
98 _GL_WARN_ON_USE (getrandom, "getrandom is unportable - "
99 "use gnulib module getrandom for portability");
100 # endif
101 #endif
102
103
104 #endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */
105 #endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */