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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
29 lines
816 B
C++
29 lines
816 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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// NOTE: The length is passed by pointer because off_t is 64bit,
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// hence it can't be passed by register on 32bit platforms.
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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(Pledge::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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