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75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/*
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__ __ _
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___\ \/ /_ __ __ _| |_
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/ _ \\ /| '_ \ / _` | __|
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| __// \| |_) | (_| | |_
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\___/_/\_\ .__/ \__,_|\__|
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|_| XML parser
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Copyright (c) 2017-2026 Sebastian Pipping <sebastian@pipping.org>
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Copyright (c) 2026 Matthew Fernandez <matthew.fernandez@gmail.com>
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Licensed under the MIT license:
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to permit
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persons to whom the Software is furnished to do so, subject to the
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following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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USE OR OTHER DEALINGS IN THE SOFTWARE.
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SPDX-License-Identifier: MIT
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*/
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#include "random_dev_urandom.h"
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#if ! defined(_POSIX_C_SOURCE) \
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|| (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE < 200809L))
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# define _POSIX_C_SOURCE 200809L // for O_CLOEXEC
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#endif
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#include <errno.h>
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#include <fcntl.h> // open
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#include <unistd.h> // close
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/* Extract entropy from /dev/urandom */
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bool
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writeRandomBytes_dev_urandom(void *target, size_t count) {
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int success = false; /* full count bytes written? */
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size_t bytesWrittenTotal = 0;
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const int fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
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if (fd < 0) {
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return false;
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}
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do {
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void *const currentTarget = (char *)target + bytesWrittenTotal;
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const size_t bytesToWrite = count - bytesWrittenTotal;
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errno = 0;
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const ssize_t bytesWrittenMore = read(fd, currentTarget, bytesToWrite);
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if (bytesWrittenMore > 0) {
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bytesWrittenTotal += bytesWrittenMore;
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if (bytesWrittenTotal >= count)
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success = true;
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}
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} while (! success && (errno == EINTR));
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close(fd);
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return success;
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}
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