736
/* EJ ejects CD-ROM disk tray */

#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <string.h>
#include <alloc.h>

#define MULTIPLEX_INT   0x2f
#define INIT_MP_INT     0x1500
#define CDREQ_MP_INT    0x1510

#define STAT_HAS_AN_ERROR 0x8000
#define STAT_BUSY         0x0200
#define STAT_DONE         0x0100

int CDRomLoaded,CDRomDrive;

#define WRITE_IOCTL_COMMAND   12

struct ReqHdrStruc {
	unsigned char ParamLength;
	unsigned char SubUnit;
	unsigned char CommandCode;
	unsigned int  Status;
	unsigned long Reserved1;
	unsigned long Reserved2;
};

struct IOCTLStruc {
   struct ReqHdrStruc ReqHdr;
   unsigned char Meddescr;
   unsigned long Transfaddr;
   unsigned int  Numbytes;
   unsigned int  Startsec;
   unsigned long volID;
};

struct EjectStruc {
	unsigned char CntrlCode;
};

struct IOCTLStruc IOCTLBlock;
struct EjectStruc EjectBlock;

long LastSector;
int NumTracks;

int *buffer;

main()
{
	if (!CheckCD2F()){
		printf("MSCDEX NOT LOADED\n");
		exit(1);
	}
	Eject();
}


CheckCD2F()
{
union REGS regs;

	regs.x.ax = INIT_MP_INT;
	int86(MULTIPLEX_INT,&regs,&regs);
	CDRomLoaded = regs.x.bx;
	CDRomDrive = regs.x.cx;
}

Eject()
{
union REGS regs;
struct SREGS sregs;

	EjectBlock.CntrlCode = 0;

	IOCTLBlock.ReqHdr.ParamLength = 13;
	IOCTLBlock.ReqHdr.SubUnit     = 0;
	IOCTLBlock.ReqHdr.CommandCode = WRITE_IOCTL_COMMAND;
	IOCTLBlock.ReqHdr.Status      = 0;

	IOCTLBlock.Meddescr = 0;
	IOCTLBlock.Transfaddr =  (unsigned long)&EjectBlock;
	IOCTLBlock.Numbytes = 1;
	IOCTLBlock.Startsec = 0;
	IOCTLBlock.volID = 0;

	regs.x.ax = CDREQ_MP_INT;
	regs.x.bx = FP_OFF(&IOCTLBlock);
	regs.x.cx = CDRomDrive;
	sregs.es  = FP_SEG(&IOCTLBlock);

	int86x(MULTIPLEX_INT,&regs,&regs,&sregs);

	return(IOCTLBlock.ReqHdr.Status);
}
.

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