1  /* Implementation of the getrandom system call.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <sys/random.h>
      20  #include <errno.h>
      21  #include <unistd.h>
      22  #include <sysdep-cancel.h>
      23  
      24  /* Write up to LENGTH bytes of randomness starting at BUFFER.
      25     Return the number of bytes written, or -1 on error.  */
      26  ssize_t
      27  __getrandom (void *buffer, size_t length, unsigned int flags)
      28  {
      29    return SYSCALL_CANCEL (getrandom, buffer, length, flags);
      30  }
      31  libc_hidden_def (__getrandom)
      32  weak_alias (__getrandom, getrandom)