140 lines
4.0 KiB
C++
140 lines
4.0 KiB
C++
/*
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Copyright (c) 2012-2018, Arvid Norberg
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All rights reserved.
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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
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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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
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/config.hpp"
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#include "libtorrent/platform_util.hpp"
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#include <cstdint>
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#include <limits>
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#if TORRENT_USE_RLIMIT
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#include <sys/resource.h>
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// capture this here where warnings are disabled (the macro generates warnings)
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const rlim_t rlimit_as = RLIMIT_AS;
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const rlim_t rlimit_nofile = RLIMIT_NOFILE;
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const rlim_t rlim_infinity = RLIM_INFINITY;
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#endif // TORRENT_USE_RLIMIT
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#ifdef TORRENT_BSD
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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#if defined TORRENT_WINDOWS
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#include "libtorrent/aux_/windows.hpp"
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#endif
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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namespace libtorrent {
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int max_open_files()
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{
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#if defined TORRENT_BUILD_SIMULATOR
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return 256;
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#elif TORRENT_USE_RLIMIT
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struct rlimit rl{};
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if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
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{
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if (rl.rlim_cur == rlim_infinity)
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return std::numeric_limits<int>::max();
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return rl.rlim_cur <= static_cast<rlim_t>(std::numeric_limits<int>::max())
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? static_cast<int>(rl.rlim_cur) : std::numeric_limits<int>::max();
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}
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return 1024;
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#else
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// this seems like a reasonable limit for windows.
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// http://blogs.msdn.com/b/oldnewthing/archive/2007/07/18/3926581.aspx
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return 10000;
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#endif
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}
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std::int64_t total_physical_ram()
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{
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#if defined TORRENT_BUILD_SIMULATOR
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return std::int64_t(4) * 1024 * 1024 * 1024;
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#else
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// figure out how much physical RAM there is in
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// this machine. This is used for automatically
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// sizing the disk cache size when it's set to
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// automatic.
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std::int64_t ret = 0;
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#ifdef TORRENT_BSD
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#ifdef HW_MEMSIZE
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int mib[2] = { CTL_HW, HW_MEMSIZE };
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#else
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// not entirely sure this sysctl supports 64
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// bit return values, but it's probably better
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// than not building
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int mib[2] = { CTL_HW, HW_PHYSMEM };
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#endif
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std::size_t len = sizeof(ret);
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if (sysctl(mib, 2, &ret, &len, nullptr, 0) != 0)
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ret = 0;
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#elif defined TORRENT_WINDOWS
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MEMORYSTATUSEX ms;
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ms.dwLength = sizeof(MEMORYSTATUSEX);
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if (GlobalMemoryStatusEx(&ms))
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ret = ms.ullTotalPhys;
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else
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ret = 0;
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#elif defined TORRENT_LINUX
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ret = sysconf(_SC_PHYS_PAGES);
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ret *= sysconf(_SC_PAGESIZE);
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#elif defined TORRENT_AMIGA
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ret = AvailMem(MEMF_PUBLIC);
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#endif
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#if TORRENT_USE_RLIMIT
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if (ret > 0)
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{
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struct rlimit r{};
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if (getrlimit(rlimit_as, &r) == 0 && r.rlim_cur != rlim_infinity)
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{
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if (ret > std::int64_t(r.rlim_cur))
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ret = std::int64_t(r.rlim_cur);
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}
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}
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#endif
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return ret;
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#endif // TORRENT_BUILD_SIMULATOR
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}
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}
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