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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.
30 lines
727 B
C++
30 lines
727 B
C++
/*
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* Copyright (c) 2018-2020, 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/FileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$ftruncate(int fd, Userspace<off_t*> userspace_length)
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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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off_t length;
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if (!copy_from_user(&length, userspace_length))
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return EFAULT;
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if (length < 0)
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return EINVAL;
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auto description = fds().file_description(fd);
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if (!description)
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return EBADF;
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if (!description->is_writable())
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return EBADF;
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return description->truncate(static_cast<u64>(length));
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}
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}
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