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7c87891c06
Instead of copying a Vector everytime we need to enumerate a Process' file descriptions, we can just temporarily lock so it won't change.
29 lines
763 B
C++
29 lines
763 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$lseek(int fd, Userspace<off_t*> userspace_offset, int whence)
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{
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REQUIRE_PROMISE(stdio);
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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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off_t offset;
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if (!copy_from_user(&offset, userspace_offset))
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return EFAULT;
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auto seek_result = description->seek(offset, whence);
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if (seek_result.is_error())
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return seek_result.error();
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if (!copy_to_user(userspace_offset, &seek_result.value()))
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return EFAULT;
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return KSuccess;
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}
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}
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