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- /*
- History:
- Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
- process control of SCSI devices.
- Development Sponsored by Killy Corp. NY NY
- */
-
- /*
- An SG device is accessed by writting "packets" to it, the replies
- are then read using the read call. The same header is used for
- reply, just ignore reply_len field.
- */
-
- struct sg_header
- {
- int pack_len; /* length of incoming packet <4096 (including header) */
- int reply_len; /* maximum length <4096 of expected reply */
- int pack_id; /* id number of packet */
- int result; /* 0==ok, otherwise refer to errno codes */
- /* command follows then data for command */
- };
-
- /* ioctl's */
- #define SG_SET_TIMEOUT 0x2201 /* set timeout *(int *)arg==timeout */
- #define SG_GET_TIMEOUT 0x2202 /* get timeout return timeout */
-
- #define SG_DEFAULT_TIMEOUT 6000 /* 1 minute timeout */
- #define SG_DEFAULT_RETRIES 1
-
- #define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be
- changed if sufficient DMA buffer room available */
-
- #define SG_BIG_BUFF 32768
-