60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
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MEMORY.C - This example shows how to get information
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about free memory using DPMI call 0500h under DOS/4GW.
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Note that only the first field of the structure is
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guaranteed to contain a valid value; any field that
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is not returned by DOS/4GW is set to -1 (0FFFFFFFFh).
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Compile & Link: wcl386 /l=dos4g memory
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*/
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#include <i86.h>
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#include <dos.h>
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#include <stdio.h>
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#include <string.h>
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struct meminfo {
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unsigned LargestBlockAvail;
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unsigned MaxUnlockedPage;
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unsigned LargestLockablePage;
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unsigned LinAddrSpace;
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unsigned NumFreePagesAvail;
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unsigned NumPhysicalPagesFree;
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unsigned TotalPhysicalPages;
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unsigned FreeLinAddrSpace;
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unsigned SizeOfPageFile;
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unsigned Reserved[3];
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} MemInfo;
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#define DPMI_INT 0x31
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void main()
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{
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union REGS regs;
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struct SREGS sregs;
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regs.x.eax = 0x00000500;
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memset( &sregs, 0, sizeof(sregs) );
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sregs.es = FP_SEG( &MemInfo );
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regs.x.edi = FP_OFF( &MemInfo );
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int386x( DPMI_INT, ®s, ®s, &sregs );
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printf( "Largest available block (in bytes): %lu\n",
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MemInfo.LargestBlockAvail );
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printf( "Maximum unlocked page allocation: %lu\n",
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MemInfo.MaxUnlockedPage );
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printf( "Pages that can be allocated and locked: %lu\n",
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MemInfo.LargestLockablePage );
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printf( "Total linear address space including allocated"
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" pages: %lu\n", MemInfo.LinAddrSpace );
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printf( "Number of free pages available: %lu\n",
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MemInfo.NumFreePagesAvail );
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printf( "Number of physical pages not in use: %lu\n",
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MemInfo.NumPhysicalPagesFree );
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printf( "Total physical pages managed by host: %lu\n",
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MemInfo.TotalPhysicalPages );
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printf( "Free linear address space (pages): %lu\n",
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MemInfo.FreeLinAddrSpace );
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printf( "Size of paging/file partition (pages): %lu\n",
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MemInfo.SizeOfPageFile );
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}
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