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/* 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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