mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
52 lines
2.5 KiB
C
52 lines
2.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/getauxval.internal.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/sysv/consts/auxv.h"
|
|
|
|
/**
|
|
* Returns auxiliary value.
|
|
*
|
|
* @return auxiliary value or 0 if `key` not found
|
|
* @see libc/sysv/consts.sh
|
|
* @see System Five Application Binary Interface § 3.4.3
|
|
* @error ENOENT when value not found
|
|
* @asyncsignalsafe
|
|
*/
|
|
unsigned long getauxval(unsigned long key) {
|
|
struct AuxiliaryValue x;
|
|
x = __getauxval(key);
|
|
if (key == AT_PAGESZ) {
|
|
if (!x.isfound) {
|
|
#ifdef __aarch64__
|
|
x.value = 16384;
|
|
#else
|
|
x.value = 4096;
|
|
#endif
|
|
}
|
|
x.isfound = true;
|
|
}
|
|
if (x.isfound) {
|
|
return x.value;
|
|
} else {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
}
|