This repository has been archived on 2024-12-16. You can view files and clone it, but cannot push or open issues or pull requests.
CodeBlocksPortable/WATCOM/samples/goodies/memwin.c

65 lines
2 KiB
C

/*
MEMWIN.C - This example shows how to get information
about free memory with DPMI call 0x0500 using Windows
as a DPMI host. Note that only the first field of the
structure is guaranteed to contain a valid value; any
field that is not returned by the DPMI implementation
is set to -1 (0FFFFFFFFh).
Compile & Link: wcl386 /l=win386 /zw memwin
Bind: wbind -n memwin
*/
#include <windows.h>
#include <i86.h>
#include <dos.h>
#include <stdio.h>
struct meminfo {
unsigned LargestBlockAvail;
unsigned MaxUnlockedPage;
unsigned LargestLockablePage;
unsigned LinAddrSpace;
unsigned NumFreePagesAvail;
unsigned NumPhysicalPagesFree;
unsigned TotalPhysicalPages;
unsigned FreeLinAddrSpace;
unsigned SizeOfPageFile;
unsigned Reserved[3];
} MemInfo;
#define DPMI_INT 0x31
void main()
{
union REGS regs;
struct SREGS sregs;
DWORD mi_16;
regs.w.ax = 0x0500;
mi_16 = AllocAlias16( &MemInfo );
sregs.ds = 0;
sregs.es = HIWORD( mi_16 );
regs.x.di = LOWORD( mi_16 );
int86x( DPMI_INT, &regs, &regs, &sregs );
printf( "Largest available block (in bytes): %ld\n",
MemInfo.LargestBlockAvail );
printf( "Maximum unlocked page allocation: %lu\n",
MemInfo.MaxUnlockedPage );
printf( "Pages that can be allocated and locked: %lu\n",
MemInfo.LargestLockablePage );
printf( "Total linear address space including allocated"
" pages: %lu\n", MemInfo.LinAddrSpace );
printf( "Number of free pages available: %lu\n",
MemInfo.NumFreePagesAvail );
printf( "Number of physical pages not in use: %lu\n",
MemInfo.NumPhysicalPagesFree );
printf( "Total physical pages managed by host: %lu\n",
MemInfo.TotalPhysicalPages );
printf( "Free linear address space (pages): %lu\n",
MemInfo.FreeLinAddrSpace );
printf( "Size of paging/file partition (pages): %lu\n",
MemInfo.SizeOfPageFile );
FreeAlias16( mi_16 );
}