Re: calling open() on an older cd device returns EBUSY??
Re: calling open() on an older cd device returns EBUSY??
- Subject: Re: calling open() on an older cd device returns EBUSY??
- From: "David M. Cotter" <email@hidden>
- Date: Tue, 03 May 2005 11:10:51 -0700
huh, well that's quite interesting, cuz the same CD works just fine on my other computer (with the DVD-R).
This is how I get the device name, as documented by Apple:
GetVolParmsInfoBuffer volumeParms; structclr(volumeParms);
HParamBlockRec pb;
// Use the volume reference number to retrieve the volume parameters. See the documentation
// on PBHGetVolParmsSync for other possible ways to specify a volume.
pb.ioParam.ioNamePtr = NULL;
pb.ioParam.ioVRefNum = volSpec.vRefNum;
pb.ioParam.ioBuffer = (Ptr) &volumeParms;
pb.ioParam.ioReqCount = sizeof(volumeParms);
ETRL(PBHGetVolParmsSync(&pb), "Error PBHGetVolParmsSync");
// A version 4 GetVolParmsInfoBuffer contains the BSD node name in the vMDeviceID field.
// It is actually a char * value. This is mentioned in the header CoreServices/CarbonCore/Files.h.
const char *bsdNodeNameZ = (char *)volumeParms.vMDeviceID;
// create (return) the device path to the volume
sprintf(pathZ, "/dev/%s", bsdNodeNameZ);
why does this code work fine on my DVD-R, but not on my CD-R/W? It also works fine on my Plextor CD-R/W
On May 3, 2005, at 7:28 AM, Shantonu Sen wrote:
/dev/disk2 is the entire CD. You want a particular session, like the first session. that would be /dev/disk2s1 (which might have further subdivision into /dev/disk2s1s3). For ISO CDs, it might be /dev/disk2s0.
Shantonu
On May 2, 2005, at 11:49 PM, David M.Cotter wrote:
i_fd = open(i_bsd_vol_path, O_RDONLY, 0);
i_bsd_vol_path is "/dev/disk2" which is my cd drive (trust me)
but i_fd == -1 and errno == 16 (EBUSY)
Why is the device busy? Is it really just "not capable"? .
the drive that fails is a "<x-tad-smaller>MATSHITA</x-tad-smaller> CD-RW CW-7121"
this works fine on a modern drive eg: "<x-tad-smaller>MATSHITA DVD-R UJ-815</x-tad-smaller>" or "" _______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden