mirror of
https://github.com/morgan9e/systemd
synced 2026-04-16 01:16:10 +09:00
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 */
|
|
|
|
#include <unistd.h>
|
|
|
|
#include "memory-util.h"
|
|
#include "missing_threads.h"
|
|
|
|
size_t page_size(void) {
|
|
static thread_local size_t pgsz = 0;
|
|
long r;
|
|
|
|
if (_likely_(pgsz > 0))
|
|
return pgsz;
|
|
|
|
r = sysconf(_SC_PAGESIZE);
|
|
assert(r > 0);
|
|
|
|
pgsz = (size_t) r;
|
|
return pgsz;
|
|
}
|
|
|
|
bool memeqbyte(uint8_t byte, const void *data, size_t length) {
|
|
/* Does the buffer consist entirely of the same specific byte value?
|
|
* Copied from https://github.com/systemd/casync/, copied in turn from
|
|
* https://github.com/rustyrussell/ccan/blob/master/ccan/mem/mem.c#L92,
|
|
* which is licensed CC-0.
|
|
*/
|
|
|
|
const uint8_t *p = data;
|
|
|
|
/* Check first 16 bytes manually */
|
|
for (size_t i = 0; i < 16; i++, length--) {
|
|
if (length == 0)
|
|
return true;
|
|
if (p[i] != byte)
|
|
return false;
|
|
}
|
|
|
|
/* Now we know first 16 bytes match, memcmp() with self. */
|
|
return memcmp(data, p + 16, length) == 0;
|
|
}
|