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https://github.com/morgan9e/systemd
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5545f336fd
IN C23, thread_local is a reserved keyword and we shall therefore do nothing to redefine it. glibc has it defined for older standard version with the right conditions. v2 by Yu Watanabe: Move the definition to missing_threads.h like the way we define e.g. missing syscalls or missing definitions, and include it by the users. Co-authored-by: Yu Watanabe <watanabe.yu+github@gmail.com>
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <unistd.h>
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#include "memory-util.h"
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#include "missing_threads.h"
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size_t page_size(void) {
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static thread_local size_t pgsz = 0;
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long r;
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if (_likely_(pgsz > 0))
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return pgsz;
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r = sysconf(_SC_PAGESIZE);
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assert(r > 0);
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pgsz = (size_t) r;
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return pgsz;
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}
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bool memeqbyte(uint8_t byte, const void *data, size_t length) {
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/* Does the buffer consist entirely of the same specific byte value?
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* Copied from https://github.com/systemd/casync/, copied in turn from
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* https://github.com/rustyrussell/ccan/blob/master/ccan/mem/mem.c#L92,
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* which is licensed CC-0.
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*/
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const uint8_t *p = data;
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/* Check first 16 bytes manually */
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for (size_t i = 0; i < 16; i++, length--) {
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if (length == 0)
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return true;
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if (p[i] != byte)
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return false;
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}
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/* Now we know first 16 bytes match, memcmp() with self. */
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return memcmp(data, p + 16, length) == 0;
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}
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