mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-21 10:05:32 +00:00
1a08ac72ad
This API was a mostly gratuitous deviation from POSIX that gave up some portability in exchange for avoiding the occasional strlen(). I don't think that was actually achieving anything valuable, so let's just chill out and have the same open() API as everyone else. :^)
83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
/*
|
|
* Copyright (c) 2020, the SerenityOS developers.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <AK/StackInfo.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#ifdef __serenity__
|
|
# include <serenity.h>
|
|
#elif defined(__linux__) or defined(__APPLE__)
|
|
# include <pthread.h>
|
|
#endif
|
|
|
|
namespace AK {
|
|
|
|
StackInfo::StackInfo()
|
|
{
|
|
#ifdef __serenity__
|
|
if (get_stack_bounds(&m_base, &m_size) < 0) {
|
|
perror("get_stack_bounds");
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
#elif __linux__
|
|
pthread_attr_t attr = {};
|
|
if (int rc = pthread_getattr_np(pthread_self(), &attr) != 0) {
|
|
fprintf(stderr, "pthread_getattr_np: %s\n", strerror(-rc));
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
if (int rc = pthread_attr_getstack(&attr, (void**)&m_base, &m_size) != 0) {
|
|
fprintf(stderr, "pthread_attr_getstack: %s\n", strerror(-rc));
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
pthread_attr_destroy(&attr);
|
|
#elif __APPLE__
|
|
// NOTE: !! On MacOS, pthread_get_stackaddr_np gives the TOP of the stack, not the bottom!
|
|
FlatPtr top_of_stack = (FlatPtr)pthread_get_stackaddr_np(pthread_self());
|
|
m_size = (size_t)pthread_get_stacksize_np(pthread_self());
|
|
// https://github.com/rust-lang/rust/issues/43347#issuecomment-316783599
|
|
// https://developer.apple.com/library/archive/qa/qa1419/_index.html
|
|
//
|
|
// MacOS seems inconsistent on what stack size is given for the main thread.
|
|
// According to the Apple docs, default for main thread is 8MB, and default for
|
|
// other threads is 512KB
|
|
constexpr size_t eight_megabytes = 0x800000;
|
|
if (pthread_main_np() == 1 && m_size < eight_megabytes) {
|
|
// Assume no one messed with stack size linker options for the main thread,
|
|
// and just set it to 8MB.
|
|
m_size = eight_megabytes;
|
|
}
|
|
m_base = top_of_stack - m_size;
|
|
#else
|
|
ASSERT_NOT_REACHED();
|
|
#endif
|
|
|
|
m_top = m_base + m_size;
|
|
}
|
|
|
|
}
|