kc3-lang/gnulib/lib/getentropy.c

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• lib/getentropy.c

• /* Fill a buffer with random bytes.
     Copyright 2020-2025 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation, either version 3 of the
     License, or (at your option) any later version.
  
     This file is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include <unistd.h>
  
  #include <errno.h>
  #include <sys/random.h>
  
  /* Overwrite BUFFER with random data.  BUFFER contains LENGTH bytes.
     LENGTH must be at most 256.  Return 0 on success, -1 (setting
     errno) on failure.  */
  int
  getentropy (void *buffer, size_t length)
  {
    char *buf = buffer;
  
    if (length <= 256)
      for (;;)
        {
          ssize_t bytes;
          if (length == 0)
            return 0;
          while ((bytes = getrandom (buf, length, 0)) < 0)
            if (errno != EINTR)
              return -1;
          if (bytes == 0)
            break;
          buf += bytes;
          length -= bytes;
        }
  
    errno = EIO;
    return -1;
  }
  

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