/*

Copyright (c) 2020, zywo

Copyright (c) 2020, zywo

Copyright (c) 2010, 2014-2016, 2018, 2020-2022, Arvid Norberg

Copyright (c) 2021, Alden Torres

All rights reserved.

You may use, distribute and modify this code under the terms of the BSD license,

see LICENSE file.

*/

#include "libtorrent/config.hpp"

#include "libtorrent/aux_/platform_util.hpp"

#include <cstdint>

#include <limits>

#if TORRENT_HAS_PTHREAD_SET_NAME

#include <pthread.h>

#ifdef TORRENT_BSD

#include <pthread_np.h>

#endif

#endif

#ifdef TORRENT_BEOS

#include <kernel/OS.h>

#endif

#include "libtorrent/aux_/disable_warnings_push.hpp"

#if TORRENT_USE_RLIMIT

#include <sys/resource.h>

// capture this here where warnings are disabled (the macro generates warnings)

const rlim_t rlimit_as = RLIMIT_AS;

const rlim_t rlimit_nofile = RLIMIT_NOFILE;

const rlim_t rlim_infinity = RLIM_INFINITY;

#endif // TORRENT_USE_RLIMIT

#ifdef TORRENT_BSD

#include <sys/types.h>

#include <sys/sysctl.h>

#endif

#if defined TORRENT_WINDOWS

#include "libtorrent/aux_/windows.hpp"

#include "libtorrent/aux_/win_util.hpp"

#endif

#include "libtorrent/aux_/disable_warnings_pop.hpp"

namespace libtorrent::aux {

  int max_open_files()

  {

#if defined TORRENT_BUILD_SIMULATOR

    return 256;

#elif TORRENT_USE_RLIMIT

    int const inf = 10000000;

    struct rlimit rl{};

    if (getrlimit(RLIMIT_NOFILE, &rl) == 0)

    {

      if (rl.rlim_cur == rlim_infinity) return inf;

      return rl.rlim_cur <= static_cast<rlim_t>(inf)

        ? static_cast<int>(rl.rlim_cur) : inf;

    }

    return 1024;

#else

    // this seems like a reasonable limit for windows.

    // http://blogs.msdn.com/b/oldnewthing/archive/2007/07/18/3926581.aspx

    return 10000;

#endif

  }

  void set_thread_name(char const* name)

  {

    TORRENT_UNUSED(name);

#if TORRENT_HAS_PTHREAD_SET_NAME

#ifdef TORRENT_BSD

    pthread_set_name_np(pthread_self(), name);

#else

    pthread_setname_np(pthread_self(), name);

#endif

#endif

#ifdef TORRENT_WINDOWS

    using SetThreadDescription_t = HRESULT (WINAPI*)(HANDLE, PCWSTR);

    auto SetThreadDescription =

      aux::get_library_procedure<aux::kernel32, SetThreadDescription_t>("SetThreadDescription");

    if (SetThreadDescription) {

      wchar_t wide_name[50];

      int i = -1;

      do {

        ++i;

        wide_name[i] = name[i];

      } while (name[i] != 0);

      SetThreadDescription(GetCurrentThread(), wide_name);

    }

#endif

#ifdef TORRENT_BEOS

    rename_thread(find_thread(nullptr), name);

#endif

  }

}