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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
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/Process.h>
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namespace Kernel {
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extern String* g_hostname;
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extern Mutex* g_hostname_lock;
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KResultOr<FlatPtr> Process::sys$gethostname(Userspace<char*> buffer, size_t size)
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{
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REQUIRE_PROMISE(stdio);
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if (size > NumericLimits<ssize_t>::max())
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return EINVAL;
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Locker locker(*g_hostname_lock, Mutex::Mode::Shared);
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if (size < (g_hostname->length() + 1))
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return ENAMETOOLONG;
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if (!copy_to_user(buffer, g_hostname->characters(), g_hostname->length() + 1))
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return EFAULT;
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$sethostname(Userspace<const char*> hostname, size_t length)
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{
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REQUIRE_NO_PROMISES;
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if (!is_superuser())
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return EPERM;
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Locker locker(*g_hostname_lock, Mutex::Mode::Exclusive);
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if (length > 64)
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return ENAMETOOLONG;
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auto copied_hostname = copy_string_from_user(hostname, length);
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if (copied_hostname.is_null())
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return EFAULT;
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*g_hostname = move(copied_hostname);
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return 0;
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}
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}
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