?? sg.h
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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
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