kc3-lang/gnulib/tests/test-getentropy.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-getentropy.c

• /* Test the getentropy function.
     Copyright 2020-2023 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 <string.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (getentropy, int, (void *, size_t));
  
  #include "macros.h"
  
  char empty_buf[256];
  char buf[256];
  
  int
  main (int argc, char *argv[])
  {
    /* If this test fails, there's something wrong with the setup anyway.  */
    ASSERT (getentropy (buf, sizeof buf) == 0);
  
    /* This test fails with probability 2**-2048.  (Run it again if so. :-) */
    ASSERT (memcmp (buf, empty_buf, sizeof buf) != 0);
  
    /* It is very unlikely that two calls to getentropy produce the same
       results.  */
    {
      char buf1[8];
      char buf2[8];
  
      ASSERT (getentropy (buf1, sizeof (buf1)) == 0);
      ASSERT (getentropy (buf2, sizeof (buf2)) == 0);
      ASSERT (memcmp (buf1, buf2, sizeof (buf1)) != 0);
    }
  
    return 0;
  }
  

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