cosmopolitan/libc/thread/pthread_attr_setguardsize.c
2024-07-21 14:40:45 -07:00

37 lines
2.5 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 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/thread/thread.h"
/**
* Sets size of protected region at bottom of thread stack.
*
* Cosmopolitan sets this value to `sysconf(_SC_PAGESIZE)` by default.
*
* You may set `guardsize` to disable the stack guard feature and gain a
* slight performance advantage by avoiding mprotect() calls. Note that
* it could make your code more prone to silent unreported corruption.
*
* @param guardsize contains guard size in bytes, which is implicitly
* rounded up to `sysconf(_SC_PAGESIZE)`, or zero to disable
* @return 0 on success, or errno on error
*/
errno_t pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize) {
attr->__guardsize = guardsize;
return 0;
}