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https://github.com/RGBCube/serenity
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286984750e
Now that support for 32-bit x86 has been removed, we don't have to worry about the top half of `off_t`/`u64` values being chopped off when we try to pass them in registers. Therefore, we no longer need the workaround of pointers to stack-allocated values to syscalls. Note that this changes the system call ABI, so statically linked programs will have to be re-linked.
25 lines
600 B
C++
25 lines
600 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/Tasks/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$ftruncate(int fd, off_t length)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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if (length < 0)
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return EINVAL;
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auto description = TRY(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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