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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Process.h>
namespace Kernel {
extern String* g_hostname;
extern Lock* g_hostname_lock;
int Process::sys$gethostname(Userspace<char*> buffer, ssize_t size)
{
REQUIRE_PROMISE(stdio);
if (size < 0)
return -EINVAL;
LOCKER(*g_hostname_lock, Lock::Mode::Shared);
if ((size_t)size < (g_hostname->length() + 1))
return -ENAMETOOLONG;
if (!copy_to_user(buffer, g_hostname->characters(), g_hostname->length() + 1))
return -EFAULT;
return 0;
}
int Process::sys$sethostname(Userspace<const char*> hostname, ssize_t length)
{
REQUIRE_NO_PROMISES;
if (!is_superuser())
return -EPERM;
if (length < 0)
return -EINVAL;
LOCKER(*g_hostname_lock, Lock::Mode::Exclusive);
if (length > 64)
return -ENAMETOOLONG;
auto copied_hostname = copy_string_from_user(hostname, length);
if (copied_hostname.is_null())
return -EFAULT;
*g_hostname = move(copied_hostname);
return 0;
}
}
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