With the device unmounted, sending the reset command
causes the drive to become active and I see the
activity light light up. With the device mounted, the
activity light does nothing. I also can't open the
CD-ROM drive using the eject button after resetting a
mounted CD.
It seems the reset command should work even if the OS
thinks the device is mounted for error recovery.
Here is my test program:
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/cdrom.h>
int main(int argc, char* argv[])
{
int fd, result;
fd = open("/dev/hda", O_RDONLY|O_NONBLOCK);
if (fd < 0)
{
perror("open");
return fd;
}
result = ioctl(fd, CDROMRESET, 1);
if (result < 0)
perror("ioctl");
close(fd);
return 0;
}
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