by I have been posting that I have a nec ide cdchanger, and wanted to be able
to read the other 3 drives. A guy had the same problem as me, and I told
him I would give him the fix if I found it...well I lost his e-mail so I'm
posting this here in hopes he'll see it.
The fix is in a file called ide_cd or something like that right in with
some module docs...right on my system! It was installed with the Red Hat
6.0 installation.
In the doc it has c++ code for a little util that will change the cd-drive
on your changer...you run this when the drive is not mounted. It goes
something like this (After I compiled my code with the c++ comand line
compiler I called it "cdchange")
cdchange /dev/cdrom 2 (for drive bay number 2)
Here is what you do:
1. Copy the code below to a file and compile it by typing c++ myfile
2. take the a.out file rename it to cdchange and set the permissions like
this:
chmod ugo+x,ugo+r cdchange
3. Move the file somewhere in the PATH like /usr/bin
4. Make a script file , if you want that will unmount your cd change the
drive and remount.
Here's the code:
/*
* cdchange.c [-v] <device> [<slot>]
*
* This loads a CDROM from a specified slot in a changer, and displays
* information about the changer status. The drive should be unmounted
before
* using this program.
*
* Changer information is displayed if either the -v flag is specified
* or no slot was specified.
*
* Based on code originally from Gerhard Zuber <zu...@berlin.snafu.de>.
* Changer status information, and rewrite for the new Uniform CDROM driver
* interface by Erik Andersen <ander...@debian.org>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/cdrom.h>
int
main (int argc, char **argv)
{
char *program;
char *device;
int fd; /* file descriptor for CD-ROM device */
int status; /* return status for system calls */
int verbose = 0;
int slot=-1, x_slot;
int total_slots_available;
program = argv[0];
++argv;
--argc;
if (argc < 1 || argc > 3) {
fprintf (stderr, "usage: %s [-v] <device> [<slot>]\n",
program);
fprintf (stderr, " Slots are numbered 1 -- n.\n");
exit (1);
}
if (strcmp (argv[0], "-v") == 0) {
verbose = 1;
++argv;
--argc;
}
device = argv[0];
if (argc == 2)
slot = atoi (argv[1]) - 1;
/* open device */
fd = open(device, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
fprintf (stderr, "%s: open failed for `%s': %s\n",
program, device, strerror (errno));
exit (1);
}
/* Check CD player status */
total_slots_available = ioctl (fd, CDROM_CHANGER_NSLOTS);
if (total_slots_available <= 1 ) {
fprintf (stderr, "%s: Device `%s' is not an ATAPI "
"compliant CD changer.\n", program, device);
exit (1);
}
if (slot >= 0) {
if (slot >= total_slots_available) {
fprintf (stderr, "Bad slot number. "
"Should be 1 -- %d.\n",
total_slots_available);
exit (1);
}
/* load */
slot=ioctl (fd, CDROM_SELECT_DISC, slot);
if (slot<0) {
fflush(stdout);
perror ("CDROM_SELECT_DISC ");
exit(1);
}
}
if (slot < 0 || verbose) {
status=ioctl (fd, CDROM_SELECT_DISC, CDSL_CURRENT);
if (status<0) {
fflush(stdout);
perror (" CDROM_SELECT_DISC");
exit(1);
}
slot=status;
printf ("Current slot: %d\n", slot+1);
printf ("Total slots available: %d\n",
total_slots_available);
printf ("Drive status: ");
status = ioctl (fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (status<0) {
perror(" CDROM_DRIVE_STATUS");
} else switch(status) {
case CDS_DISC_OK:
printf ("Ready.\n");
break;
case CDS_TRAY_OPEN:
printf ("Tray Open.\n");
break;
case CDS_DRIVE_NOT_READY:
printf ("Drive Not Ready.\n");
break;
default:
printf ("This Should not happen!\n");
break;
}
for (x_slot=0; x_slot<total_slots_available; x_slot++) {
printf ("Slot %2d: ", x_slot+1);
status = ioctl (fd, CDROM_DRIVE_STATUS, x_slot);
if (status<0) {
perror(" CDROM_DRIVE_STATUS");
} else switch(status) {
case CDS_DISC_OK:
printf ("Disc present.");
break;
case CDS_NO_DISC:
printf ("Empty slot.");
break;
case CDS_TRAY_OPEN:
printf ("CD-ROM tray open.\n");
break;
case CDS_DRIVE_NOT_READY:
printf ("CD-ROM drive not ready.\n");
break;
case CDS_NO_INFO:
printf ("No Information available.");
break;
default:
printf ("This Should not happen!\n");
break;
}
if (slot == x_slot) {
status = ioctl (fd, CDROM_DISC_STATUS);
if (status<0) {
perror(" CDROM_DISC_STATUS");
}
switch (status) {
case CDS_AUDIO:
printf ("\tAudio disc.\t");
break;
case CDS_DATA_1:
case CDS_DATA_2:
printf ("\tData disc type %d.\t", status-CDS_DATA_1+1);
break;
case CDS_XA_2_1:
case CDS_XA_2_2:
printf ("\tXA data disc type %d.\t", status-CDS_XA_2_1+1);
break;
default:
printf ("\tUnknown disc type 0x%x!\t", status);
break;
}
}
status = ioctl (fd, CDROM_MEDIA_CHANGED, x_slot);
if (status<0) {
perror(" CDROM_MEDIA_CHANGED");
}
switch (status) {
case 1:
printf ("Changed.\n");
break;
default:
printf ("\n");
break;
}
}
}
/* close device */
status = close (fd);
if (status != 0) {
fprintf (stderr, "%s: close failed for `%s': %s\n",
program, device, strerror (errno));
exit (1);
}
exit (0);