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https://github.com/RGBCube/serenity
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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
55 lines
1.4 KiB
C++
55 lines
1.4 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/Process.h>
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#include <Kernel/VM/AnonymousVMObject.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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int new_fd = m_fds.allocate();
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if (new_fd < 0)
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return new_fd;
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auto vmobject = AnonymousVMObject::try_create_with_size(size, AllocationStrategy::Reserve);
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if (!vmobject)
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return ENOMEM;
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auto anon_file = AnonymousFile::create(vmobject.release_nonnull());
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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].set(move(description), fd_flags);
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return new_fd;
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}
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}
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