mirror of
https://git.savannah.gnu.org/git/gnulib.git
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0e0dc90965
Done through
sed -e 's/memcmp \([(][^()]*[)]\) != 0/!memeq \1/g' \
-e 's/memcmp \([(][^()]*[(][^()]*[)][^()]*[)]\) != 0/!memeq \1/g'
* tests/**/*.[hc]: Use !memeq instead of memcmp ... != 0.
* modules/*-tests (Dependencies): Add memeq.
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* Test of getting random bytes.
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Copyright (C) 2020-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible. */
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#include <config.h>
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#include <sys/random.h>
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#include "signature.h"
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SIGNATURE_CHECK (getrandom, ssize_t, (void *, size_t, unsigned int));
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#include <errno.h>
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#include <string.h>
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#include "macros.h"
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int
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main (void)
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{
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char buf1[8];
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char buf2[8];
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char large_buf[100000];
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ssize_t ret;
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/* Check that different calls produce different results (with a high
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probability). */
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ret = getrandom (buf1, sizeof (buf1), 0);
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if (ret < 0)
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ASSERT (errno == ENOSYS);
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else
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{
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ret = getrandom (buf2, sizeof (buf2), 0);
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if (ret < 0)
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ASSERT (errno == ENOSYS);
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else
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{
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/* It is very unlikely that two calls to getrandom produce the
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same results. */
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ASSERT (!memeq (buf1, buf2, sizeof (buf1)));
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}
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}
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/* Likewise with the "truly random" number generator. */
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ret = getrandom (buf1, sizeof (buf1), GRND_RANDOM);
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if (ret < 0)
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ASSERT (errno == ENOSYS);
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else
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{
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ret = getrandom (buf2, sizeof (buf2), GRND_RANDOM);
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if (ret < 0)
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ASSERT (errno == ENOSYS);
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else
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{
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/* It is very unlikely that two calls to getrandom produce the
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same results. */
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ASSERT (!memeq (buf1, buf2, sizeof (buf1)));
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}
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}
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/* Check that GRND_NONBLOCK works. */
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ret = getrandom (large_buf, sizeof (large_buf), GRND_RANDOM | GRND_NONBLOCK);
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ASSERT (ret <= (ssize_t) sizeof (large_buf));
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/* It is very unlikely that so many truly random bytes were ready. */
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if (ret < 0)
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ASSERT (errno == ENOSYS || errno == EAGAIN
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|| errno == EINVAL /* Solaris */);
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else
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ASSERT (ret > 0);
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if (getrandom (buf1, 1, 0) < 1)
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if (getrandom (buf1, 1, GRND_RANDOM) < 1)
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{
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if (test_exit_status != EXIT_SUCCESS)
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return test_exit_status;
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fputs ("Skipping test: getrandom is ineffective\n", stderr);
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return 77;
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}
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return test_exit_status;
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}
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