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 */