kc3-lang/gnulib/lib/getentropy.c

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• Hash : 682cc4e6
  Author :
  Date : 2020-05-25T09:19:56
  

  getentropy, getrandom: new modules
  
  * MODULES.html.sh (func_all_modules):
  * lib/unistd.in.h (getentropy, getrandom):
  * m4/unistd_h.m4 (gl_UNISTD_H, gl_UNISTD_H_DEFAULTS):
  * modules/unistd (unistd.h):
  Add support for getentropy, getrandom.
  * doc/glibc-functions/getentropy.texi (getentropy):
  * doc/glibc-functions/getrandom.texi (getrandom):
  These are now fixed on some platforms.
  * lib/getentropy.c, lib/getrandom.c, lib/sys_random.in.h:
  * m4/getentropy.m4, m4/getrandom.m4:
  * modules/getentropy, modules/getentropy-tests:
  * modules/getrandom, modules/getrandom-tests:
  * tests/test-getentropy.c, tests/test-getrandom.c:
  New files.
  

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• lib/getentropy.c

• /* Fill a buffer with random bytes.
     Copyright 2020 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU 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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