forked from 0ad/0ad
126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/**
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* =========================================================================
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* File : wposix.cpp
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* Project : 0 A.D.
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* Description : emulate a subset of POSIX on Win32.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "wposix.h"
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#include "wposix_internal.h"
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#include "crt_posix.h" // _getcwd
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#include "lib/bits.h"
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#pragma SECTION_PRE_LIBC(J)
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WIN_REGISTER_FUNC(wposix_Init);
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#pragma FORCE_INCLUDE(wposix_Init)
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#pragma SECTION_RESTORE
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//-----------------------------------------------------------------------------
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// sysconf
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// used by _SC_PAGESIZE and _SC_*_PAGES
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static DWORD page_size;
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static BOOL (WINAPI *pGlobalMemoryStatusEx)(MEMORYSTATUSEX*);
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static void InitSysconf()
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{
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// get page size
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// (used by _SC_PAGESIZE and _SC_*_PAGES)
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SYSTEM_INFO si;
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GetSystemInfo(&si); // can't fail => page_size always > 0.
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page_size = si.dwPageSize;
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// import GlobalMemoryStatusEx - it's not defined by the VC6 PSDK.
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// used by _SC_*_PAGES if available (provides better results).
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const HMODULE hKernel32Dll = LoadLibrary("kernel32.dll");
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*(void**)&pGlobalMemoryStatusEx = GetProcAddress(hKernel32Dll, "GlobalMemoryStatusEx");
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FreeLibrary(hKernel32Dll);
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}
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long sysconf(int name)
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{
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debug_assert(page_size); // must not be called before InitSysconf
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switch(name)
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{
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case _SC_PAGESIZE:
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// note: no separate case for _SC_PAGE_SIZE - they are
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// different names but have the same value.
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return page_size;
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case _SC_PHYS_PAGES:
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case _SC_AVPHYS_PAGES:
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{
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u64 total_phys_mem;
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u64 avail_phys_mem;
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// first query GlobalMemoryStatus - cannot fail.
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// override its results if GlobalMemoryStatusEx is available.
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{
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MEMORYSTATUS ms;
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GlobalMemoryStatus(&ms);
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total_phys_mem = ms.dwTotalPhys;
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avail_phys_mem = ms.dwAvailPhys;
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}
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// newer API is available: use it to report correct results
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// (no overflow or wraparound) on systems with > 4 GB of memory.
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{
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MEMORYSTATUSEX mse = { sizeof(mse) };
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if(pGlobalMemoryStatusEx && pGlobalMemoryStatusEx(&mse))
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{
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total_phys_mem = mse.ullTotalPhys;
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avail_phys_mem = mse.ullAvailPhys;
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}
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// else: not an error, since this isn't available before Win2k / XP.
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// we have results from GlobalMemoryStatus anyway.
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}
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// Richter, "Programming Applications for Windows": the reported
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// value doesn't include non-paged pool reserved during boot;
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// it's not considered available to kernel. (size is 528 KiB on
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// a 512 MiB WinXP/Win2k machine)
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// something similar may happen on other OSes, so it is fixed
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// by cpu.cpp instead of here.
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if(name == _SC_PHYS_PAGES)
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return (long)(total_phys_mem / page_size);
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else
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return (long)(avail_phys_mem / page_size);
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}
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default:
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return -1;
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}
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}
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//-----------------------------------------------------------------------------
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#ifdef REDEFINED_NEW
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# include "lib/nommgr.h"
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#endif
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char* getcwd(char* buf, size_t buf_size)
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{
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return _getcwd(buf, (int)buf_size);
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}
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#ifdef REDEFINED_NEW
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# include "lib/mmgr.h"
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#endif
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//-----------------------------------------------------------------------------
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static LibError wposix_Init()
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{
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InitSysconf();
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return INFO::OK;
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}
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