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 */