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ac71775de5
This makes it a lot easier to return errors since we no longer have to worry about negating EFOO errors and can just return them flat.
65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 Lock* g_hostname_lock;
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KResultOr<int> Process::sys$gethostname(Userspace<char*> buffer, ssize_t size)
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{
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REQUIRE_PROMISE(stdio);
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if (size < 0)
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return EINVAL;
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LOCKER(*g_hostname_lock, Lock::Mode::Shared);
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if ((size_t)size < (g_hostname->length() + 1))
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return ENAMETOOLONG;
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if (!copy_to_user(buffer, g_hostname->characters(), g_hostname->length() + 1))
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return EFAULT;
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return 0;
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}
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KResultOr<int> Process::sys$sethostname(Userspace<const char*> hostname, ssize_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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if (length < 0)
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return EINVAL;
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LOCKER(*g_hostname_lock, Lock::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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