janwas
78c751aff6
file: now provides a much more efficient alternative to file_enum that does not sort all files (this was a problem for check_if_oal_dll which was scanning the entire system32 dir) - use the same DirEnt struct for file and VFS due to clever name pointer trick. - wposix: avoid malloc for most opendir() and fix mmap() bugs (thanks to Philip for noticing+reporting them) - VFS: was getting too large to manage, now split into an additional file - WIP: much more efficient mounting; supports other mount sources than file or zip (e.g. if we want to add network files); clean separation between VFS submodules; dox; beginning of thread locking. This was SVN commit r2589.
843 lines
21 KiB
C++
Executable File
843 lines
21 KiB
C++
Executable File
// misc. POSIX routines for Win32
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//
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// Copyright (c) 2004 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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// collection of hacks :P
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#include "precompiled.h"
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#include "lib.h"
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#include "posix.h"
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#include "win_internal.h"
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#include "sysdep/cpu.h"
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#include <stdio.h>
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#include <stdlib.h>
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// cast intptr_t to HANDLE; centralized for easier changing, e.g. avoiding
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// warnings. i = -1 converts to INVALID_HANDLE_VALUE (same value).
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static HANDLE cast_to_HANDLE(intptr_t i)
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{
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return (HANDLE)((char*)0 + i);
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// file
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//
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//////////////////////////////////////////////////////////////////////////////
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int open(const char* fn, int oflag, ...)
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{
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const bool is_com_port = strncmp(fn, "/dev/tty", 8) == 0;
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// also used later, before aio_reopen
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// translate "/dev/tty%d" to "COM%d"
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if(is_com_port)
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{
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char port[] = "COM1";
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const char digit = fn[8]+1;
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// PCs only support COM1..COM4.
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if(!('1' <= digit && digit <= '4'))
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return -1;
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port[3] = digit;
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fn = port;
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}
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mode_t mode = 0;
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if(oflag & O_CREAT)
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{
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va_list args;
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va_start(args, oflag);
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mode = va_arg(args, mode_t);
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va_end(args);
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}
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WIN_SAVE_LAST_ERROR; // CreateFile
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int fd = _open(fn, oflag, mode);
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WIN_RESTORE_LAST_ERROR;
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#if CONFIG_PARANOIA
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debug_printf("open %s = %d\n", fn, fd);
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#endif
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// cases when we don't want to open a second AIO-capable handle:
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// .. stdin/stdout/stderr
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if(fd <= 2)
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goto no_aio;
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// .. COM port - we don't currently need AIO access for those, and
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// aio_reopen's CreateFile would fail with "access denied".
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if(is_com_port)
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goto no_aio;
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// .. caller is requesting we skip it (see file_open)
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if(oflag & O_NO_AIO_NP)
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goto no_aio;
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// none of the above apply; now re-open the file.
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// note: this is possible because _open defaults to DENY_NONE sharing.
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aio_reopen(fd, fn, oflag);
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no_aio:
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// CRT doesn't like more than 255 files open.
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// warn now, so that we notice why so many are open.
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#ifndef NDEBUG
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if(fd > 256)
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debug_warn("wposix: too many files open (CRT limitation)");
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#endif
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return fd;
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}
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int close(int fd)
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{
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#if CONFIG_PARANOIA
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debug_printf("close %d\n", fd);
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#endif
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debug_assert(3 <= fd && fd < 256);
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// note: there's no good way to notify us that <fd> wasn't opened for
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// AIO, so we could skip aio_close. storing a bit in the fd is evil and
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// a fd -> info map is redundant (waio already has one).
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// therefore, we require aio_close to fail gracefully.
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aio_close(fd);
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return _close(fd);
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}
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// we don't want to #define read to _read, since that's a fairly common
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// identifier. therefore, translate from MS CRT names via thunk functions.
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// efficiency is less important, and the overhead could be optimized away.
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int read(int fd, void* buf, size_t nbytes)
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{
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return _read(fd, buf, nbytes);
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}
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int write(int fd, void* buf, size_t nbytes)
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{
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return _write(fd, buf, nbytes);
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}
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int ioctl(int fd, int op, int* data)
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{
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const HANDLE h = cast_to_HANDLE(_get_osfhandle(fd));
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switch(op)
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{
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case TIOCMGET:
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/* TIOCM_* mapped directly to MS_*_ON */
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GetCommModemStatus(h, (DWORD*)data);
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break;
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case TIOCMBIS:
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/* only RTS supported */
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if(*data & TIOCM_RTS)
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EscapeCommFunction(h, SETRTS);
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else
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EscapeCommFunction(h, CLRRTS);
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break;
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case TIOCMIWAIT:
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static DWORD mask;
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DWORD new_mask = 0;
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if(*data & TIOCM_CD)
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new_mask |= EV_RLSD;
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if(*data & TIOCM_CTS)
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new_mask |= EV_CTS;
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if(new_mask != mask)
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SetCommMask(h, mask = new_mask);
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WaitCommEvent(h, &mask, 0);
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break;
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}
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return 0;
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}
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//
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// determine file system type on the current drive -
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// needed to work around incorrect FAT time translation.
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//
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static enum Filesystem
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{
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FS_INVALID, // detect_filesystem() not yet called
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FS_FAT, // FAT12, FAT16, or FAT32
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FS_NTFS, // (most common)
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FS_UNKNOWN // newer FS we don't know about
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}
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filesystem;
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// rationale: the previous method of checking every path was way too slow
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// (taking ~800ms total during init). instead, we only determine the FS once.
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// this is quite a bit easier than intercepting chdir() calls and/or
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// caching FS type per drive letter, but not foolproof.
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//
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// if some data files are on a different volume that is set up as FAT,
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// the workaround below won't be triggered (=> timestamps may be off by
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// 1 hour when DST is in effect). oh well, that is not a supported.
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//
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// the common case (everything is on a single NTFS volume) is more important
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// and must run without penalty.
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// called from the first filetime_to_time_t() call, not win.cpp init;
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// this means we can rely on the current directory having been set to
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// the app's directory (and therefore its appendant volume - see above).
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static void detect_filesystem()
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{
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char root_path[MAX_PATH] = "c:\\"; // default in case GCD fails
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DWORD gcd_ret = GetCurrentDirectory(sizeof(root_path), root_path);
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debug_assert(gcd_ret != 0);
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// if this fails, no problem - we have the default from above.
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root_path[3] = '\0'; // cut off after "c:\"
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char fs_name[32] = {0};
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BOOL ret = GetVolumeInformation(root_path, 0,0,0,0,0, fs_name, sizeof(fs_name));
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fs_name[ARRAY_SIZE(fs_name)-1] = '\0';
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debug_assert(ret != 0);
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// if this fails, no problem - we really only care if fs is FAT,
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// and will assume that's not the case (since fs_name != "FAT").
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filesystem = FS_UNKNOWN;
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if(!strncmp(fs_name, "FAT", 3)) // e.g. FAT32
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filesystem = FS_FAT;
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else if(!strcmp(fs_name, "NTFS"))
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filesystem = FS_NTFS;
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}
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// from wtime
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extern time_t local_filetime_to_time_t(FILETIME* ft);
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extern time_t utc_filetime_to_time_t(FILETIME* ft);
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// convert Windows FILETIME to POSIX time_t (seconds-since-1970 UTC);
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// used by stat and readdir_stat_np for st_mtime.
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//
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// works around a documented Windows bug in converting FAT file times
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// (correct results are desired since VFS mount logic considers
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// files 'equal' if their mtime and size are the same).
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static time_t filetime_to_time_t(FILETIME* ft)
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{
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ONCE(detect_filesystem());
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// the FAT file system stores local file times, while
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// NTFS records UTC. Windows does convert automatically,
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// but uses the current DST settings. (boo!)
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// we go back to local time, and convert properly.
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if(filesystem == FS_FAT)
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{
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FILETIME local_ft;
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FileTimeToLocalFileTime(ft, &local_ft);
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return local_filetime_to_time_t(&local_ft);
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}
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return utc_filetime_to_time_t(ft);
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}
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/*
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// currently only sets st_mode (file or dir) and st_size.
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int stat(const char* fn, struct stat* s)
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{
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memset(s, 0, sizeof(struct stat));
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WIN32_FILE_ATTRIBUTE_DATA fad;
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if(!GetFileAttributesEx(fn, GetFileExInfoStandard, &fad))
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return -1;
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s->st_mtime = filetime_to_time_t(fad.ftLastAccessTime)
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// dir
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if(fad.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
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s->st_mode = S_IFDIR;
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else
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{
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s->st_mode = S_IFREG;
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s->st_size = (off_t)((((u64)fad.nFileSizeHigh) << 32) | fad.nFileSizeLow);
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}
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return 0;
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}
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*/
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//////////////////////////////////////////////////////////////////////////////
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//
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// dir
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//
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//////////////////////////////////////////////////////////////////////////////
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#undef getcwd
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char* getcwd(char* buf, size_t buf_size)
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{
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return _getcwd(buf, buf_size);
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}
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char* realpath(const char* fn, char* path)
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{
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if(!GetFullPathName(fn, PATH_MAX, path, 0))
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return 0;
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return path;
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}
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int mkdir(const char* path, mode_t)
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{
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return CreateDirectory(path, 0)? 0 : -1;
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}
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// opendir/readdir/closedir
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//
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// implementation rationale:
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//
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// opendir only performs minimal error checks (does directory exist?);
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// readdir calls FindFirstFile. this is to ensure correct handling
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// of empty directories. we need to store the path in WDIR anyway
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// for filetime_to_time_t.
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//
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// we avoid opening directories or returning files that have hidden or system
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// attributes set. this is to prevent returning something like
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// "\System Volume Information", which raises an error upon opening.
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struct WDIR
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{
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HANDLE hFind;
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WIN32_FIND_DATA fd;
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struct dirent ent;
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// can't be global - must not be overwritten by
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// calls from different DIRs.
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char path[PATH_MAX+1];
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// can't be stored in fd or ent's path fields -
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// needed by each readdir_stat_np (for filetime_to_time_t).
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};
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// suballocator - satisfies most requests with a reusable static instance.
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// this avoids hundreds of alloc/free which would fragment the heap.
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// to guarantee thread-safety, we fall back to malloc if the instance is
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// already in use. (it's important to avoid suprises since this is such a
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// low-level routine).
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static WDIR global_wdir;
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static uintptr_t global_wdir_in_use;
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// zero-initializes the WDIR (code below relies on this)
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static inline WDIR* wdir_alloc()
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{
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// successfully reserved the global instance
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if(CAS(&global_wdir_in_use, 0, 1))
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{
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memset(&global_wdir, 0, sizeof(global_wdir));
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return &global_wdir;
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}
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return (WDIR*)calloc(1, sizeof(WDIR));
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}
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static inline void wdir_free(WDIR* d)
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{
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if(d == &global_wdir)
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global_wdir_in_use = 0;
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else
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free(d);
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}
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static const DWORD hs = FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM;
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DIR* opendir(const char* path)
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{
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// make sure path exists and is a normal directory (see rationale above).
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// note: this is the only error check we can do here -
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// FindFirstFile is called in readdir (see rationale above).
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DWORD fa = GetFileAttributes(path);
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if((fa == INVALID_FILE_ATTRIBUTES) || !(fa & FILE_ATTRIBUTE_DIRECTORY) || (fa & hs))
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return 0;
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WDIR* d = wdir_alloc();
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if(!d)
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return 0;
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// note: "path\\dir" only returns information about that directory;
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// trailing slashes aren't allowed. we have to append "\\*" to find files.
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snprintf(d->path, sizeof(d->path)-1, "%s\\*", path);
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return d;
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}
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struct dirent* readdir(DIR* d_)
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{
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WDIR* const d = (WDIR*)d_;
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// avoid polluting the last error.
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DWORD prev_err = GetLastError();
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// bails if end of dir reached or error.
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// runs again if entry was rejected below.
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get_another_entry:
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// first time
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if(d->hFind == 0)
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{
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d->hFind = FindFirstFile(d->path, &d->fd);
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if(d->hFind == INVALID_HANDLE_VALUE)
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goto fail;
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}
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else
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{
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if(!FindNextFile(d->hFind, &d->fd))
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goto fail;
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}
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// d->fd is now valid. since we must not return hidden or system entries,
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// get another one if this one is (see rationale above).
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if(d->fd.dwFileAttributes & hs)
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goto get_another_entry;
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// this entry has passed all checks; return information about it.
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// .. d_ino zero-initialized by opendir
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// .. POSIX requires d_name to be an array, so we have to copy there.
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strcpy_s(d->ent.d_name, sizeof(d->ent.d_name), d->fd.cFileName);
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return &d->ent;
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fail:
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// Find*File failed; determine why and bail.
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// .. legit, end of dir reached. don't pollute last error code.
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if(GetLastError() == ERROR_NO_MORE_FILES)
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SetLastError(prev_err);
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else
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debug_warn("readdir: Find*File failed");
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return (struct dirent*)0;
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}
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// return status for the dirent returned by the last successful
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// readdir call from the given directory stream.
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// currently sets st_size, st_mode, and st_mtime; the rest are zeroed.
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// non-portable, but considerably faster than stat(). used by file_enum.
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int readdir_stat_np(DIR* d_, struct stat* s)
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{
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WDIR* d = (WDIR*)d_;
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memset(s, 0, sizeof(struct stat));
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s->st_size = (off_t)((((u64)d->fd.nFileSizeHigh) << 32) | d->fd.nFileSizeLow);
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s->st_mode = (d->fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)? S_IFDIR : S_IFREG;
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s->st_mtime = filetime_to_time_t(&d->fd.ftLastWriteTime);
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return 0;
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}
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int closedir(DIR* d_)
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{
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WDIR* const d = (WDIR*)d_;
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FindClose(d->hFind);
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wdir_free(d);
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return 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// terminal
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//
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//////////////////////////////////////////////////////////////////////////////
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static HANDLE std_h[2] = { (HANDLE)((char*)0 + 3), (HANDLE)((char*)0 + 7) };
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void _get_console()
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{
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AllocConsole();
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}
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void _hide_console()
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{
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FreeConsole();
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}
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|
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int tcgetattr(int fd, struct termios* termios_p)
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{
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if(fd >= 2)
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return -1;
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HANDLE h = std_h[fd];
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DWORD mode;
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GetConsoleMode(h, &mode);
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termios_p->c_lflag = mode & (ENABLE_ECHO_INPUT|ENABLE_LINE_INPUT);
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return 0;
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}
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int tcsetattr(int fd, int /* optional_actions */, const struct termios* termios_p)
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{
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if(fd >= 2)
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return -1;
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HANDLE h = std_h[fd];
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SetConsoleMode(h, (DWORD)termios_p->c_lflag);
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FlushConsoleInputBuffer(h);
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return 0;
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}
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int poll(struct pollfd /* fds */[], int /* nfds */, int /* timeout */)
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{
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return -1;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// memory mapping
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//
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//////////////////////////////////////////////////////////////////////////////
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// convert POSIX PROT_* flags to their Win32 PAGE_* enumeration equivalents.
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// used by mprotect.
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static DWORD win32_prot(int prot)
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{
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// this covers all possible combinations of read|write|exec
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// (note that "none" means all flags are 0).
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switch(prot)
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{
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case PROT_NONE:
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return PAGE_NOACCESS;
|
|
case PROT_READ:
|
|
return PAGE_READONLY;
|
|
case PROT_WRITE:
|
|
// not supported by Win32; POSIX allows us to also grant read access.
|
|
return PAGE_READWRITE;
|
|
case PROT_EXEC:
|
|
return PAGE_EXECUTE;
|
|
case PROT_READ|PROT_WRITE:
|
|
return PAGE_READWRITE;
|
|
case PROT_READ|PROT_EXEC:
|
|
return PAGE_EXECUTE_READ;
|
|
case PROT_WRITE|PROT_EXEC:
|
|
// not supported by Win32; POSIX allows us to also grant read access.
|
|
return PAGE_EXECUTE_READWRITE;
|
|
case PROT_READ|PROT_WRITE|PROT_EXEC:
|
|
return PAGE_EXECUTE_READWRITE;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
int mprotect(void* addr, size_t len, int prot)
|
|
{
|
|
const DWORD flNewProtect = win32_prot(prot);
|
|
DWORD flOldProtect; // required by VirtualProtect
|
|
BOOL ok = VirtualProtect(addr, len, flNewProtect, &flOldProtect);
|
|
return ok? 0 : -1;
|
|
}
|
|
|
|
|
|
// given mmap prot and flags, output protection/access values for use with
|
|
// CreateFileMapping / MapViewOfFile. they only support read-only,
|
|
// read/write and copy-on-write, so we dumb it down to that and later
|
|
// set the correct (and more restrictive) permission via mprotect.
|
|
static int mmap_access(int prot, int flags, DWORD& flProtect, DWORD& dwAccess, SECURITY_ATTRIBUTES*& psec)
|
|
{
|
|
SECURITY_ATTRIBUTES* saved_psec = psec;
|
|
|
|
// assume read-only with default security; other cases handled below.
|
|
flProtect = PAGE_READONLY;
|
|
dwAccess = FILE_MAP_READ;
|
|
psec = 0;
|
|
// we go to a bit of trouble and return a NULL pointer in the
|
|
// default case; this is more efficient.
|
|
|
|
if(prot & PROT_WRITE)
|
|
{
|
|
flProtect = PAGE_READWRITE;
|
|
dwAccess = FILE_MAP_WRITE; // read and write
|
|
|
|
// determine write behavior: (whether they change the underlying file)
|
|
switch(flags & (MAP_SHARED|MAP_PRIVATE))
|
|
{
|
|
// .. POSIX says asking for both isn't allowed.
|
|
case MAP_SHARED|MAP_PRIVATE:
|
|
return ERR_INVALID_PARAM;
|
|
// .. changes are written to file and shared between processes.
|
|
case MAP_SHARED:
|
|
psec = saved_psec;
|
|
psec->nLength = sizeof(SECURITY_ATTRIBUTES);
|
|
psec->lpSecurityDescriptor = 0;
|
|
psec->bInheritHandle = TRUE;
|
|
break;
|
|
// .. copy-on-write mapping; writes do not affect the file or
|
|
// other processes.
|
|
case MAP_PRIVATE:
|
|
flProtect = PAGE_WRITECOPY;
|
|
dwAccess = FILE_MAP_COPY;
|
|
break;
|
|
// .. changes are written to file but the handle isn't shareable.
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void* mmap(void* user_start, size_t len, int prot, int flags, int fd, off_t ofs)
|
|
{
|
|
{
|
|
WIN_SAVE_LAST_ERROR;
|
|
int err;
|
|
|
|
// assume fd = -1 (requesting mapping backed by page file),
|
|
// so that we notice invalid file handles below.
|
|
HANDLE hFile = INVALID_HANDLE_VALUE;
|
|
if(fd != -1)
|
|
{
|
|
hFile = cast_to_HANDLE(_get_osfhandle(fd));
|
|
if(hFile == INVALID_HANDLE_VALUE)
|
|
{
|
|
debug_warn("mmap: invalid file handle");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
// if MAP_FIXED, user_start is the start address; otherwise,
|
|
// MapViewOfFileEx will choose an address.
|
|
void* start = 0;
|
|
if(flags & MAP_FIXED)
|
|
{
|
|
start = user_start;
|
|
if(start == 0) // debug_assert below would fire
|
|
goto fail;
|
|
}
|
|
|
|
// choose protection and access rights for CreateFileMapping /
|
|
// MapViewOfFile. these are weaker than what PROT_* allows and
|
|
// are augmented below by subsequently mprotect-ing.
|
|
DWORD flProtect; DWORD dwAccess;
|
|
SECURITY_ATTRIBUTES sec_; SECURITY_ATTRIBUTES* psec = &sec_;
|
|
err = mmap_access(prot, flags, flProtect, dwAccess, psec);
|
|
if(err < 0)
|
|
goto fail;
|
|
|
|
// enough foreplay; now actually map.
|
|
// .. split size/offset into 32 bit values for the API.
|
|
// careful! C++ doesn't allow shifting 32-bit types by 32 bits.
|
|
const DWORD len_hi = u64_hi(len), len_lo = u64_lo(len);
|
|
const DWORD ofs_hi = u64_hi(ofs), ofs_lo = u64_lo(ofs);
|
|
const HANDLE hMap = CreateFileMapping(hFile, psec, flProtect, len_hi, len_lo, (LPCSTR)0);
|
|
// .. create failed; bail now to avoid overwriting the last error value.
|
|
if(!hMap)
|
|
goto fail;
|
|
void* addr = MapViewOfFileEx(hMap, dwAccess, ofs_hi, ofs_lo, (SIZE_T)len, start);
|
|
// .. make sure we got the requested address if MAP_FIXED was passed.
|
|
debug_assert(!(flags & MAP_FIXED) || (addr == start));
|
|
// .. free the mapping object now, so that we don't have to hold on to its
|
|
// handle until munmap(). it's not actually released yet due to the
|
|
// reference held by MapViewOfFileEx (if it succeeded).
|
|
CloseHandle(hMap);
|
|
// .. map failed; bail now to avoid "restoring" the last error value.
|
|
if(!addr)
|
|
goto fail;
|
|
|
|
// slap on correct (more restrictive) permissions.
|
|
WARN_ERR(mprotect(addr, len, prot));
|
|
|
|
WIN_RESTORE_LAST_ERROR;
|
|
return addr;
|
|
}
|
|
|
|
fail:
|
|
return MAP_FAILED;
|
|
}
|
|
|
|
|
|
int munmap(void* start, size_t UNUSED(len))
|
|
{
|
|
BOOL ok = UnmapViewOfFile(start);
|
|
return ok? 0 : -1;
|
|
}
|
|
|
|
|
|
|
|
|
|
int uname(struct utsname* un)
|
|
{
|
|
static OSVERSIONINFO vi;
|
|
vi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
|
|
GetVersionEx(&vi);
|
|
|
|
// OS implementation name
|
|
const char* family = "??";
|
|
int ver = (vi.dwMajorVersion << 8) | vi.dwMinorVersion;
|
|
if(vi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
|
|
family = (ver == 0x045a)? "ME" : "9x";
|
|
if(vi.dwPlatformId == VER_PLATFORM_WIN32_NT)
|
|
{
|
|
if(ver == 0x0500)
|
|
family = "2k";
|
|
else if(ver == 0x0501)
|
|
family = "XP";
|
|
else
|
|
family = "NT";
|
|
}
|
|
sprintf(un->sysname, "Win%s", family);
|
|
|
|
// release info
|
|
const char* vs = vi.szCSDVersion;
|
|
int sp;
|
|
if(sscanf(vs, "Service Pack %d", &sp) == 1)
|
|
sprintf(un->release, "SP %d", sp);
|
|
else
|
|
{
|
|
const char* release = "";
|
|
if(vi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
|
|
{
|
|
if(!strcmp(vs, " C"))
|
|
release = "OSR2";
|
|
else if(!strcmp(vs, " A"))
|
|
release = "SE";
|
|
}
|
|
strcpy(un->release, release); // safe
|
|
}
|
|
|
|
// version
|
|
sprintf(un->version, "%lu.%02lu.%lu", vi.dwMajorVersion, vi.dwMinorVersion, vi.dwBuildNumber & 0xffff);
|
|
|
|
// node name
|
|
DWORD buf_size = sizeof(un->nodename);
|
|
DWORD last_err = GetLastError();
|
|
BOOL ok = GetComputerName(un->nodename, &buf_size);
|
|
// GetComputerName sets last error even on success - suppress.
|
|
if(ok)
|
|
SetLastError(last_err);
|
|
else
|
|
debug_warn("GetComputerName failed");
|
|
|
|
// hardware type
|
|
static SYSTEM_INFO si;
|
|
GetSystemInfo(&si);
|
|
if(si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
|
|
strcpy(un->machine, "AMD64"); // safe
|
|
else
|
|
strcpy(un->machine, "IA-32"); // safe
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
long sysconf(int name)
|
|
{
|
|
// used by _SC_*_PAGES
|
|
static DWORD page_size;
|
|
static BOOL (WINAPI *pGlobalMemoryStatusEx)(MEMORYSTATUSEX*);
|
|
|
|
ONCE(
|
|
{
|
|
// get page size
|
|
// (used by _SC_PAGESIZE and _SC_*_PAGES)
|
|
SYSTEM_INFO si;
|
|
GetSystemInfo(&si); // can't fail => page_size always > 0.
|
|
page_size = si.dwPageSize;
|
|
|
|
// import GlobalMemoryStatusEx - it's not defined by the VC6 PSDK.
|
|
// used by _SC_*_PAGES if available (provides better results).
|
|
const HMODULE hKernel32Dll = LoadLibrary("kernel32.dll");
|
|
*(void**)&pGlobalMemoryStatusEx = GetProcAddress(hKernel32Dll, "GlobalMemoryStatusEx");
|
|
FreeLibrary(hKernel32Dll);
|
|
// make sure the reference is released so BoundsChecker
|
|
// doesn't complain. it won't actually be unloaded anyway -
|
|
// there is at least one other reference.
|
|
}
|
|
);
|
|
|
|
|
|
switch(name)
|
|
{
|
|
case _SC_PAGESIZE:
|
|
return page_size;
|
|
|
|
case _SC_PHYS_PAGES:
|
|
case _SC_AVPHYS_PAGES:
|
|
{
|
|
u64 total_phys_mem;
|
|
u64 avail_phys_mem;
|
|
|
|
// first try GlobalMemoryStatus - cannot fail.
|
|
// override its results if GlobalMemoryStatusEx is available.
|
|
MEMORYSTATUS ms;
|
|
GlobalMemoryStatus(&ms);
|
|
// can't fail.
|
|
total_phys_mem = ms.dwTotalPhys;
|
|
avail_phys_mem = ms.dwAvailPhys;
|
|
|
|
// newer API is available: use it to report correct results
|
|
// (no overflow or wraparound) on systems with > 4 GB of memory.
|
|
MEMORYSTATUSEX mse = { sizeof(mse) };
|
|
if(pGlobalMemoryStatusEx && pGlobalMemoryStatusEx(&mse))
|
|
{
|
|
total_phys_mem = mse.ullTotalPhys;
|
|
avail_phys_mem = mse.ullAvailPhys;
|
|
}
|
|
// else: not an error, since this isn't available before Win2k / XP.
|
|
// we have results from GlobalMemoryStatus anyway.
|
|
|
|
if(name == _SC_PHYS_PAGES)
|
|
return (long)(round_up((uintptr_t)total_phys_mem, 2*MiB) / page_size);
|
|
// Richter, "Programming Applications for Windows":
|
|
// reported value doesn't include non-paged pool reserved
|
|
// during boot; it's not considered available to kernel.
|
|
// it's 528 KiB on my 512 MiB machine (WinXP and Win2k).
|
|
else
|
|
return (long)(avail_phys_mem / page_size);
|
|
}
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|