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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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v_10_03
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1003058a
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1991-10-07
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173 lines
/* ----------------------------------------------------
* LISTING 6
*
* Filename: ctl.c
* Summary: Test IOCTL program for tape
* device driver
* Author: T.W. Nelson
* Compile options:
* Version: 1.00
* Date: 29-Sep-1991
* Notes:
*
* ------------------------------------------------- */
#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>
#include <dos.h>
#include <bios.h>
#include "tape.h"
#define IOCTL_OK 0x4000 //ioctl check bit
#define IM_A_DEVICE 0x0080 //device check bit
#define IO_BUF_SIZE sizeof(CMDARG)
union REGS regs;
struct SREGS sregs;
char Dname[] = "TAPEXXXX";
int ioHandle;
CMDARG ioArg;
char *Menu[] = {
"",
"Power ON .............0",
"Power OFF ............1",
"Insert Cassette ......2",
"Eject Cassette .......3",
"Record ...............4",
"Play .................5",
"Fast Forward .........6",
"Rewind ...............7",
"Check Status .........8",
"Stop .................9",
"Quit .................<Esc>",
"",
0
};
extern int _doserrno;
int _dos_dev_info( int handle,
size_t *info )
{
/* Get information about specified handle assoc
* with a file or device and return it in 'info'.
* Returns 0 if successful, !0 if not. Error code
* contained in global '_doserrno'.
*/
regs.x.ax = 0x4400; //DOS IOCTL get device info
regs.x.bx = handle;
intdos( ®s, ®s );
*info = regs.x.dx; //assign device info word
return regs.x.cflag; //CY signals error
}
int _dos_ioctl_read( int handle,
void *iobuf,
size_t nbytes )
{
/* Read ioctl data from a character device driver
* into 'iobuf'. Returns 0 if successful, !0 if not.
* Error code contained in global '_doserrno'. This
* call ends up as the device driver's cmd code 3,
* ioctl_read.
*/
regs.x.ax = 0x4402; //DOS read ioctl data
regs.x.bx = handle;
regs.x.cx = nbytes;
sregs.ds = FP_SEG( iobuf );
regs.x.dx = FP_OFF( iobuf );
intdosx( ®s, ®s, &sregs );
return regs.x.cflag; //CY signals error
}
int _dos_ioctl_write( int handle,
void *iobuf,
size_t nbytes )
{
/* Write ioctl data to a character device driver
* from 'iobuf'. Returns 0 if successful, !0 if not.
* Error code contained in global '_doserrno'. This
* call ends up as the device driver's cmd code 12,
* ioctl_write.
*/
regs.x.ax = 0x4403; //DOS write ioctl data
regs.x.bx = handle;
regs.x.cx = nbytes;
sregs.ds = FP_SEG( iobuf );
regs.x.dx = FP_OFF( iobuf );
intdosx( ®s, ®s, &sregs );
return regs.x.cflag; //CY signals error
}
void print_menu(void )
{
char **p;
for( p = Menu; *p; p++ )
printf( "%s\n", *p );
}
main( int argc, char **argv )
{
int cmd;
size_t d_info;
ioHandle = open( Dname, O_RDWR );
if( ioHandle == -1 ) {
printf( "Unable to open TAPE device\n" );
return 1;
}
//Verify that TAPE is a device and that
//it supports ioctl calls .....
_dos_dev_info( ioHandle, &d_info );
if( (d_info & IM_A_DEVICE) == 0 ) {
printf("Sorry, '%s' is a file\n", Dname );
return 1;
}
if( (d_info & IOCTL_OK) == 0 ) {
printf("Sorry, TAPE doesn't support IOCTL\n");
return 1;
}
//Initialize the device at 'boot-up' ....
ioArg.c_state = OFF;
ioArg.cmd = CMD_POWER_ON;
_dos_ioctl_write( ioHandle, (void *) &ioArg,
IO_BUF_SIZE );
//Execute user control loop .....
while( 1 ) {
print_menu();
printf( "Enter selection: " );
cmd = bioskey(0);
cmd &= 0x00ff; //zap scan code
if( cmd == 27 )
break;
printf( "%c\n\n", cmd ); //echo cmd
ioArg.cmd = cmd - '0'; //to integer
_dos_ioctl_read( ioHandle,
(void *) &ioArg,
IO_BUF_SIZE );
}
return 0;
}
/* ----- End of File ------------------------------- */