1  /* Substitute for <sys/random.h>.
       2     Copyright (C) 2020-2021 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 3, 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 uClibc, <sys/random.h> assumes prior inclusion of <stddef.h>.  */
      27  # if defined __UCLIBC__
      28  #  include <stddef.h>
      29  # endif
      30  /* On Mac OS X 10.5, <sys/random.h> assumes prior inclusion of <sys/types.h>.
      31     On Max OS X 10.13, <sys/random.h> assumes prior inclusion of a file that
      32     includes <Availability.h>, such as <stdlib.h> or <unistd.h>.  */
      33  # if defined __APPLE__ && defined __MACH__                  /* Mac OS X */
      34  #  include <sys/types.h>
      35  #  include <stdlib.h>
      36  # endif
      37  
      38  /* The include_next requires a split double-inclusion guard.  */
      39  # @INCLUDE_NEXT@ @NEXT_SYS_RANDOM_H@
      40  
      41  #endif
      42  
      43  #ifndef _@GUARD_PREFIX@_SYS_RANDOM_H
      44  #define _@GUARD_PREFIX@_SYS_RANDOM_H
      45  
      46  #include <sys/types.h>
      47  
      48  /* Define the GRND_* constants.  */
      49  #ifndef GRND_NONBLOCK
      50  # define GRND_NONBLOCK 1
      51  # define GRND_RANDOM 2
      52  #endif
      53  
      54  /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
      55  
      56  /* The definition of _GL_ARG_NONNULL is copied here.  */
      57  
      58  /* The definition of _GL_WARN_ON_USE is copied here.  */
      59  
      60  
      61  /* Declare overridden functions.  */
      62  
      63  
      64  #if @GNULIB_GETRANDOM@
      65  /* Fill a buffer with random bytes.  */
      66  # if @REPLACE_GETRANDOM@
      67  #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
      68  #   undef getrandom
      69  #   define getrandom rpl_getrandom
      70  #  endif
      71  _GL_FUNCDECL_RPL (getrandom, ssize_t,
      72                    (void *buffer, size_t length, unsigned int flags)
      73                    _GL_ARG_NONNULL ((1)));
      74  _GL_CXXALIAS_RPL (getrandom, ssize_t,
      75                    (void *buffer, size_t length, unsigned int flags));
      76  # else
      77  #  if !@HAVE_GETRANDOM@
      78  _GL_FUNCDECL_SYS (getrandom, ssize_t,
      79                    (void *buffer, size_t length, unsigned int flags)
      80                    _GL_ARG_NONNULL ((1)));
      81  #  endif
      82  _GL_CXXALIAS_SYS (getrandom, ssize_t,
      83                    (void *buffer, size_t length, unsigned int flags));
      84  # endif
      85  _GL_CXXALIASWARN (getrandom);
      86  #elif defined GNULIB_POSIXCHECK
      87  # undef getrandom
      88  # if HAVE_RAW_DECL_GETRANDOM
      89  _GL_WARN_ON_USE (getrandom, "getrandom is unportable - "
      90                   "use gnulib module getrandom for portability");
      91  # endif
      92  #endif
      93  
      94  
      95  #endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */
      96  #endif /* _@GUARD_PREFIX@_SYS_RANDOM_H */