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69 lines
3.2 KiB
C
69 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/rlimit.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/clktck.h"
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#include "libc/runtime/sysconf.h"
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#include "libc/sysv/consts/rlim.h"
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#include "libc/sysv/consts/rlimit.h"
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static long GetResourceLimit(int resource) {
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struct rlimit rl;
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getrlimit(resource, &rl);
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if (rl.rlim_cur == RLIM_INFINITY) return -1;
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return MIN(rl.rlim_cur, LONG_MAX);
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}
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/**
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* Returns configuration value about system.
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*
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* The following parameters are supported:
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*
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* - `_SC_CLK_TCK` returns number of clock ticks per second
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* - `_SC_ARG_MAX` currently always returns 32768 due to Windows
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* - `_SC_PAGESIZE` currently always returns 65536 due to Windows
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* - `_SC_NPROCESSORS_ONLN` returns number of CPUs in the system
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*
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* Some suggestions:
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*
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* - `CLK_TCK` should be favored over `getconf(_SC_CLK_TCK)`
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* - Use `PAGESIZE` or `FRAMESIZE` instead of `getconf(_SC_PAGESIZE)`
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*/
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long sysconf(int name) {
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int n;
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switch (name) {
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case _SC_ARG_MAX:
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return ARG_MAX;
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case _SC_CHILD_MAX:
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return GetResourceLimit(RLIMIT_NPROC);
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case _SC_CLK_TCK:
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return CLK_TCK;
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case _SC_OPEN_MAX:
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return GetResourceLimit(RLIMIT_NOFILE);
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case _SC_PAGESIZE:
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return FRAMESIZE;
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case _SC_NPROCESSORS_ONLN:
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n = GetCpuCount();
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return n > 0 ? n : -1;
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default:
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return -1;
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}
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}
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