1/* Substitute for <sys/random.h>.
2   Copyright (C) 2020-2022 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#include <sys/types.h>
49
50/* Define the GRND_* constants.  */
51#ifndef GRND_NONBLOCK
52# define GRND_NONBLOCK 1
53# define GRND_RANDOM 2
54#endif
55
56/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
57
58/* The definition of _GL_ARG_NONNULL is copied here.  */
59
60/* The definition of _GL_WARN_ON_USE is copied here.  */
61
62
63/* Declare overridden functions.  */
64
65
66#if @GNULIB_GETRANDOM@
67/* Fill a buffer with random bytes.  */
68# if @REPLACE_GETRANDOM@
69#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
70#   undef getrandom
71#   define getrandom rpl_getrandom
72#  endif
73_GL_FUNCDECL_RPL (getrandom, ssize_t,
74                  (void *buffer, size_t length, unsigned int flags)
75                  _GL_ARG_NONNULL ((1)));
76_GL_CXXALIAS_RPL (getrandom, ssize_t,
77                  (void *buffer, size_t length, unsigned int flags));
78# else
79#  if !@HAVE_GETRANDOM@
80_GL_FUNCDECL_SYS (getrandom, ssize_t,
81                  (void *buffer, size_t length, unsigned int flags)
82                  _GL_ARG_NONNULL ((1)));
83#  endif
84_GL_CXXALIAS_SYS (getrandom, ssize_t,
85                  (void *buffer, size_t length, unsigned int flags));
86# endif
87_GL_CXXALIASWARN (getrandom);
88#elif defined GNULIB_POSIXCHECK
89# undef getrandom
90# if HAVE_RAW_DECL_GETRANDOM
91_GL_WARN_ON_USE (getrandom, "getrandom is unportable - "
92                 "use gnulib module getrandom for portability");
93# endif
94#endif
95
96
97#endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */
98#endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */
99