SCSI programming

rak1986 · 03-05-2009, 03:12 AM

Hello,
I am trying to communicate with a tape drive using ioctl and SCSI_IOCTL_SEND_COMMAND as ioctl(fd, SCSI_IOCTL_SEND_COMMAND, buffer);

I read that the buffer should be of the form :

Code:

struct sdata {
    unsigned int inlen;     [i] Length of data written to device
    unsigned int outlen;    [i] Length of data read from device
    unsigned char cmd[x];   [i] SCSI command (6 <= x <= 16)
                            [o] Data read from device starts here
                            [o] On error, sense buffer starts here
    unsigned char wdata[y]; [i] Data written to device starts here
   };

There may be commands only read data from the device and dont write or vice versa. Also some commands may read and write data. To what value can I set outlen so that it will cover all the 3 conditons?

Thanks

rak1986 · 03-18-2009, 06:10 AM

HI guys,
I need some help here.
Is it possible to write a generic function to support all SCSI commands?

Thanks....

03-05-2009, 03:12 AM	#1
rak1986 Registered User Join Date: Aug 2008 Posts: 22	SCSI programming Hello, I am trying to communicate with a tape drive using ioctl and SCSI_IOCTL_SEND_COMMAND as ioctl(fd, SCSI_IOCTL_SEND_COMMAND, buffer); I read that the buffer should be of the form : Code: struct sdata { unsigned int inlen; [i] Length of data written to device unsigned int outlen; [i] Length of data read from device unsigned char cmd[x]; [i] SCSI command (6 <= x <= 16) [o] Data read from device starts here [o] On error, sense buffer starts here unsigned char wdata[y]; [i] Data written to device starts here }; There may be commands only read data from the device and dont write or vice versa. Also some commands may read and write data. To what value can I set outlen so that it will cover all the 3 conditons? Thanks
rak1986 is offline

03-18-2009, 06:10 AM	#2
rak1986 Registered User Join Date: Aug 2008 Posts: 22	HI guys, I need some help here. Is it possible to write a generic function to support all SCSI commands? Thanks....
rak1986 is offline

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Linux SCSI read/write	galapogos	Linux Programming	1	12-09-2008 10:36 AM
Detect SCSI Hard Drive Serial Number	mercury529	Windows Programming	3	10-17-2006 06:23 PM
Hp C5110a Scsi	GanglyLamb	Tech Board	5	09-25-2004 07:17 AM
SCSI drivers... device conflict... no CD drives	CodeMonkey	Tech Board	2	09-10-2003 06:48 AM
SCSI Programming ?	C of Green	Networking/Device Communication	0	08-14-2003 12:09 PM