| /* |
| 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 |
