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https://github.com/SerenityOS/serenity
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dcd619bd46
Add an extra out-parameter to shbuf_get() that receives the size of the shared buffer. That way we don't need to make a separate syscall to get the size, which we always did immediately after.
124 lines
3.2 KiB
C++
124 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef __serenity__
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#include <AK/SharedBuffer.h>
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#include <AK/kmalloc.h>
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#include <Kernel/Syscall.h>
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#include <stdio.h>
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#include <serenity.h>
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namespace AK {
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RefPtr<SharedBuffer> SharedBuffer::create_with_size(int size)
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{
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void* data;
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int shbuf_id = shbuf_create(size, &data);
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if (shbuf_id < 0) {
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perror("shbuf_create");
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return nullptr;
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}
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return adopt(*new SharedBuffer(shbuf_id, size, data));
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}
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bool SharedBuffer::share_with(pid_t peer)
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{
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int ret = shbuf_allow_pid(shbuf_id(), peer);
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if (ret < 0) {
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perror("shbuf_allow_pid");
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return false;
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}
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return true;
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}
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bool SharedBuffer::share_globally()
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{
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int ret = shbuf_allow_all(shbuf_id());
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if (ret < 0) {
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perror("shbuf_allow_all");
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return false;
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}
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return true;
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}
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RefPtr<SharedBuffer> SharedBuffer::create_from_shbuf_id(int shbuf_id)
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{
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size_t size = 0;
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void* data = shbuf_get(shbuf_id, &size);
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if (data == (void*)-1) {
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perror("shbuf_get");
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return nullptr;
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}
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return adopt(*new SharedBuffer(shbuf_id, size, data));
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}
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SharedBuffer::SharedBuffer(int shbuf_id, int size, void* data)
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: m_shbuf_id(shbuf_id)
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, m_size(size)
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, m_data(data)
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{
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}
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SharedBuffer::~SharedBuffer()
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{
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if (m_shbuf_id >= 0) {
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int rc = shbuf_release(m_shbuf_id);
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if (rc < 0) {
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perror("shbuf_release");
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}
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}
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}
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void SharedBuffer::seal()
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{
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int rc = shbuf_seal(m_shbuf_id);
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if (rc < 0) {
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perror("shbuf_seal");
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ASSERT_NOT_REACHED();
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}
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}
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void SharedBuffer::set_volatile()
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{
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u32 rc = syscall(SC_shbuf_set_volatile, m_shbuf_id, true);
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ASSERT(rc == 0);
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}
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bool SharedBuffer::set_nonvolatile()
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{
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u32 rc = syscall(SC_shbuf_set_volatile, m_shbuf_id, false);
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if (rc == 0)
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return true;
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if (rc == 1)
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return false;
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ASSERT_NOT_REACHED();
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}
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}
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#endif
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