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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/AnonymousFile.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Memory/AnonymousVMObject.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
REQUIRE_PROMISE(stdio);
if (!size)
return EINVAL;
if (size % PAGE_SIZE)
return EINVAL;
if (size > NumericLimits<ssize_t>::max())
return EINVAL;
auto new_fd_or_error = m_fds.allocate();
if (new_fd_or_error.is_error())
return new_fd_or_error.error();
auto new_fd = new_fd_or_error.release_value();
auto maybe_vmobject = Memory::AnonymousVMObject::try_create_purgeable_with_size(size, AllocationStrategy::Reserve);
if (maybe_vmobject.is_error())
return maybe_vmobject.error();
auto anon_file = AnonymousFile::create(maybe_vmobject.release_value());
if (!anon_file)
return ENOMEM;
auto description_or_error = FileDescription::create(*anon_file);
if (description_or_error.is_error())
return description_or_error.error();
auto description = description_or_error.release_value();
description->set_writable(true);
description->set_readable(true);
u32 fd_flags = 0;
if (options & O_CLOEXEC)
fd_flags |= FD_CLOEXEC;
m_fds[new_fd.fd].set(move(description), fd_flags);
return new_fd.fd;
}
}
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