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39d9337db5
These syscalls don't write back to the off_t value (unlike sys$lseek) so let's take Userspace<off_t const*> instead of Userspace<off_t*>.
26 lines
683 B
C++
26 lines
683 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$ftruncate(int fd, Userspace<off_t const*> 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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auto length = TRY(copy_typed_from_user(userspace_length));
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if (length < 0)
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return EINVAL;
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auto description = TRY(fds().open_file_description(fd));
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if (!description->is_writable())
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return EBADF;
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TRY(description->truncate(static_cast<u64>(length)));
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return 0;
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}
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}
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