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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* 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/SharedBuffer.h>
#include <AK/kmalloc.h>
#include <Kernel/Syscall.h>
#include <stdio.h>
#include <unistd.h>
namespace AK {
RefPtr<SharedBuffer> SharedBuffer::create_with_size(int size)
{
void* data;
int shared_buffer_id = create_shared_buffer(size, &data);
if (shared_buffer_id < 0) {
perror("create_shared_buffer");
return nullptr;
}
return adopt(*new SharedBuffer(shared_buffer_id, size, data));
}
bool SharedBuffer::share_with(pid_t peer)
{
int ret = share_buffer_with(shared_buffer_id(), peer);
if (ret < 0) {
perror("share_buffer_with");
return false;
}
return true;
}
bool SharedBuffer::share_globally()
{
int ret = share_buffer_globally(shared_buffer_id());
if (ret < 0) {
perror("share_buffer_globally");
return false;
}
return true;
}
RefPtr<SharedBuffer> SharedBuffer::create_from_shared_buffer_id(int shared_buffer_id)
{
void* data = get_shared_buffer(shared_buffer_id);
if (data == (void*)-1) {
perror("get_shared_buffer");
return nullptr;
}
int size = get_shared_buffer_size(shared_buffer_id);
if (size < 0) {
perror("get_shared_buffer_size");
return nullptr;
}
return adopt(*new SharedBuffer(shared_buffer_id, size, data));
}
SharedBuffer::SharedBuffer(int shared_buffer_id, int size, void* data)
: m_shared_buffer_id(shared_buffer_id)
, m_size(size)
, m_data(data)
{
}
SharedBuffer::~SharedBuffer()
{
if (m_shared_buffer_id >= 0) {
int rc = release_shared_buffer(m_shared_buffer_id);
if (rc < 0) {
perror("release_shared_buffer");
}
}
}
void SharedBuffer::seal()
{
int rc = seal_shared_buffer(m_shared_buffer_id);
if (rc < 0) {
perror("seal_shared_buffer");
ASSERT_NOT_REACHED();
}
}
void SharedBuffer::set_volatile()
{
u32 rc = syscall(SC_set_shared_buffer_volatile, m_shared_buffer_id, true);
ASSERT(rc == 0);
}
bool SharedBuffer::set_nonvolatile()
{
u32 rc = syscall(SC_set_shared_buffer_volatile, m_shared_buffer_id, false);
if (rc == 0)
return true;
if (rc == 1)
return false;
ASSERT_NOT_REACHED();
}
}
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