mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
3d2cf95af1
This change also fixes a bug with gettid() being incorrect after fork(). We now implement the ENOENT behavior for getauxval(). The getuid() etc. system calls are now faster too. Plus issetugid() will work on BSDs.
80 lines
3.3 KiB
C
80 lines
3.3 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 2021 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/calls/_getauxval.internal.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/fmt/conv.h"
|
|
#include "libc/runtime/clktck.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/sysv/consts/auxv.h"
|
|
|
|
struct clockinfo_netbsd {
|
|
int32_t hz; // number of clock ticks per second
|
|
int32_t tick; // µs per tick
|
|
int32_t tickadj; // skew rate for adjtime()
|
|
int32_t stathz; // statistics clock frequency
|
|
int32_t profhz; // profiling clock frequency
|
|
};
|
|
|
|
static int clk_tck;
|
|
|
|
static dontinline int __clk_tck_init(void) {
|
|
int x;
|
|
int cmd[2];
|
|
size_t len;
|
|
struct clockinfo_netbsd clock;
|
|
if (IsWindows()) {
|
|
x = HECTONANOSECONDS;
|
|
} else if (IsXnu() || IsOpenbsd()) {
|
|
x = 100;
|
|
} else if (IsFreebsd()) {
|
|
x = 128;
|
|
} else if (IsNetbsd()) {
|
|
cmd[0] = 1; // CTL_KERN
|
|
cmd[1] = 12; // KERN_CLOCKRATE
|
|
len = sizeof(clock);
|
|
if (sysctl(cmd, 2, &clock, &len, NULL, 0) != -1) {
|
|
x = clock.hz;
|
|
} else {
|
|
x = -1;
|
|
}
|
|
} else {
|
|
x = _getauxval(AT_CLKTCK).value;
|
|
}
|
|
if (x < 1) x = 100;
|
|
clk_tck = x;
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* Returns system clock ticks per second.
|
|
*
|
|
* The returned value is memoized. This function is intended to be
|
|
* used via the `CLK_TCK` macro wrapper.
|
|
*
|
|
* The returned value is always greater than zero. It's usually 100
|
|
* hertz which means each clock tick is 10 milliseconds long.
|
|
*/
|
|
int __clk_tck(void) {
|
|
if (clk_tck) {
|
|
return clk_tck;
|
|
} else {
|
|
return __clk_tck_init();
|
|
}
|
|
}
|