lib/sys_random.in.h

   1 /* Substitute for <sys/random.h>.
   2    Copyright (C) 2020 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU 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 Mac OS X 10.5, <sys/random.h> assumes prior inclusion of <sys/types.h>.
  27    On Max OS X 10.13, <sys/random.h> assumes prior inclusion of a file that
  28    includes <Availability.h>, such as <stdlib.h> or <unistd.h>.  */
  29 # if defined __APPLE__ && defined __MACH__                  /* Mac OS X */
  30 #  include <sys/types.h>
  31 #  include <stdlib.h>
  32 # endif
  33
  34 /* The include_next requires a split double-inclusion guard.  */
  35 # @INCLUDE_NEXT@ @NEXT_SYS_RANDOM_H@
  36
  37 #endif
  38
  39 #ifndef _@GUARD_PREFIX@_SYS_RANDOM_H
  40 #define _@GUARD_PREFIX@_SYS_RANDOM_H
  41
  42 #include <sys/types.h>
  43
  44 /* Define the GRND_* constants.  */
  45 #ifndef GRND_NONBLOCK
  46 # define GRND_NONBLOCK 1
  47 # define GRND_RANDOM 2
  48 #endif
  49
  50 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  51
  52 /* The definition of _GL_ARG_NONNULL is copied here.  */
  53
  54 /* The definition of _GL_WARN_ON_USE is copied here.  */
  55
  56
  57 /* Declare overridden functions.  */
  58
  59
  60 #if @GNULIB_GETRANDOM@
  61 /* Fill a buffer with random bytes.  */
  62 # if @REPLACE_GETRANDOM@
  63 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
  64 #   undef getrandom
  65 #   define getrandom rpl_getrandom
  66 #  endif
  67 _GL_FUNCDECL_RPL (getrandom, ssize_t,
  68                   (void *buffer, size_t length, unsigned int flags)
  69                   _GL_ARG_NONNULL ((1)));
  70 _GL_CXXALIAS_RPL (getrandom, ssize_t,
  71                   (void *buffer, size_t length, unsigned int flags));
  72 # else
  73 #  if !@HAVE_GETRANDOM@
  74 _GL_FUNCDECL_SYS (getrandom, ssize_t,
  75                   (void *buffer, size_t length, unsigned int flags)
  76                   _GL_ARG_NONNULL ((1)));
  77 #  endif
  78 _GL_CXXALIAS_SYS (getrandom, ssize_t,
  79                   (void *buffer, size_t length, unsigned int flags));
  80 # endif
  81 _GL_CXXALIASWARN (getrandom);
  82 #elif defined GNULIB_POSIXCHECK
  83 # undef getrandom
  84 # if HAVE_RAW_DECL_GETRANDOM
  85 _GL_WARN_ON_USE (getrandom, "getrandom is unportable - "
  86                  "use gnulib module getrandom for portability");
  87 # endif
  88 #endif
  89
  90
  91 #endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */
  92 #endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */