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https://github.com/jart/cosmopolitan.git
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f7780de24b
Cosmopolitan now supports mremap(), which is only supported on Linux and NetBSD. First, it allows memory mappings to be relocated without copying them; this can dramatically speed up data structures like std::vector if the array size grows larger than 256kb. The mremap() system call is also 10x faster than munmap() when shrinking large memory mappings. There's now two functions, getpagesize() and getgransize() which help to write portable code that uses mmap(MAP_FIXED). Alternative sysconf() may be called with our new _SC_GRANSIZE. The madvise() system call now has a better wrapper with improved documentation.
107 lines
4.6 KiB
C
107 lines
4.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/runtime/sysconf.h"
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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/calls/struct/sysinfo.h"
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#include "libc/calls/struct/sysinfo.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/maps.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/runtime.h"
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#include "libc/runtime/sysconf.h"
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#include "libc/sysv/consts/_posix.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/limits.h"
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#include "libc/sysv/consts/rlimit.h"
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#include "libc/sysv/consts/ss.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.h"
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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_PAGESIZE` returns page size for mmap()
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* - `_SC_GRANSIZE` returns addr alignment for mmap()
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* - `_SC_CLK_TCK` returns number of clock ticks per second
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* - `_SC_ARG_MAX` will perform expensive rlimit calculations
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* - `_SC_SIGSTKSZ` returns host platform's preferred SIGSTKSZ
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* - `_SC_MINSIGSTKSZ` returns host platform's required MINSIGSTKSZ
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* - `_SC_AVPHYS_PAGES` returns average physical memory pages
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* - `_SC_PHYS_PAGES` returns physical memory pages available
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* - `_SC_NPROCESSORS_ONLN` returns number of effective CPUs
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* - `_SC_CHILD_MAX` returns maximum number of processes
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* - `_SC_OPEN_MAX` returns maximum number of open files
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*
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* @return value on success, or -1 w/ errno
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* @raise EINVAL if `name` isn't valid
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*/
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long sysconf(int name) {
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switch (name) {
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case _SC_CLK_TCK:
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return CLK_TCK;
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case _SC_PAGESIZE:
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return getpagesize();
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case _SC_GRANSIZE:
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return getgransize();
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case _SC_ARG_MAX:
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return __get_arg_max();
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case _SC_SIGSTKSZ:
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return _SIGSTKSZ;
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case _SC_MINSIGSTKSZ:
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return __get_minsigstksz();
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case _SC_CHILD_MAX:
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return __get_rlimit(RLIMIT_NPROC);
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case _SC_OPEN_MAX:
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return __get_rlimit(RLIMIT_NOFILE);
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case _SC_NPROCESSORS_CONF:
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case _SC_NPROCESSORS_ONLN:
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return __get_cpu_count();
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case _SC_PHYS_PAGES:
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return __get_phys_pages();
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case _SC_AVPHYS_PAGES:
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return __get_avphys_pages();
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case _SC_THREADS:
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return _POSIX_THREADS;
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case _SC_THREAD_DESTRUCTOR_ITERATIONS:
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return PTHREAD_DESTRUCTOR_ITERATIONS;
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case _SC_THREAD_KEYS_MAX:
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return PTHREAD_KEYS_MAX;
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case _SC_THREAD_STACK_MIN:
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return PTHREAD_STACK_MIN;
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case _SC_THREAD_THREADS_MAX:
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return LONG_MAX;
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case _SC_LINE_MAX:
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return _POSIX2_LINE_MAX;
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case _SC_MONOTONIC_CLOCK:
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return _POSIX_MONOTONIC_CLOCK;
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case _SC_HOST_NAME_MAX:
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return _POSIX_HOST_NAME_MAX;
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case _SC_SPAWN:
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return _POSIX_SPAWN;
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case _SC_SYMLOOP_MAX:
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return _POSIX_SYMLOOP_MAX;
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default:
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return einval();
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}
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}
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