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4bfd6e41b9
This makes for nicer handling of errors compared to checking whether a RefPtr is null. Additionally, this will give way to return different types of errors in the future.
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/AnonymousFile.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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REQUIRE_PROMISE(stdio);
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if (!size)
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return EINVAL;
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if (size % PAGE_SIZE)
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return EINVAL;
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if (size > NumericLimits<ssize_t>::max())
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return EINVAL;
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auto new_fd_or_error = m_fds.allocate();
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if (new_fd_or_error.is_error())
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return new_fd_or_error.error();
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auto new_fd = new_fd_or_error.release_value();
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auto maybe_vmobject = Memory::AnonymousVMObject::try_create_purgeable_with_size(size, AllocationStrategy::Reserve);
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if (maybe_vmobject.is_error())
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return maybe_vmobject.error();
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auto anon_file = AnonymousFile::create(maybe_vmobject.release_value());
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if (!anon_file)
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return ENOMEM;
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auto description_or_error = FileDescription::create(*anon_file);
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if (description_or_error.is_error())
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return description_or_error.error();
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auto description = description_or_error.release_value();
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description->set_writable(true);
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description->set_readable(true);
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u32 fd_flags = 0;
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if (options & O_CLOEXEC)
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fd_flags |= FD_CLOEXEC;
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m_fds[new_fd.fd].set(move(description), fd_flags);
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return new_fd.fd;
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}
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}
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