Dear all:
I have a CDROM device, and after I plug it into the Linux system, the Linux system will generate three device files in the directory of /dev/, such as:
scd1: block special (11/0)
sr1: link to scd1
sg1: character special(21/1)
And I write a c program to send the SCSI command of SPACE to my CDROM device. Such as :
fd = open("/dev/sg1", 0_RDWR);
ioctl(fd, SCSI_IOCTL_SEND_COMMAND, cmdbuff);
And I found that I can send the SPACE command to my CDROM device, if I open the file of /dev/sg1.
But if I open the file of /dev/scd1, then I can not send the SPACE command to my CDROM device.
Why I can not send SCSI command through /dev/scd1 ?
What difference between /dev/sg1 and /dev/scd1 ?
And how can I send send the command through /dev/scd1?
Wait for the help, thanks.
Best Regards,
Franko Fang
2009-1-17
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