text: /*
   * Copyright (c) 2018-2020, krishpranav <krisna.pranav@gmail.com>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <Kernel/Process.h>
  
  namespace Kernel {
  
  extern String* g_hostname;
  extern Lock* g_hostname_lock;
  
  KResultOr<int> Process::sys$gethostname(Userspace<char*> buffer, ssize_t size)
  {
      REQUIRE_PROMISE(stdio);
      if (size < 0)
          return EINVAL;
      Locker 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;
  }
  
  KResultOr<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 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;
  }
  
  }
  