patch-1.3.98 linux/include/scsi/sg.h

• Lines: 42
• Date: Thu May 2 07:48:55 1996
• Orig file: v1.3.97/linux/include/scsi/sg.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.97/linux/include/scsi/sg.h linux/include/scsi/sg.h
@@ -0,0 +1,41 @@
+/*
+   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
+*/
+
+#ifndef _SCSI_GENERIC_H
+#define _SCSI_GENERIC_H
+
+/* 
+ An SG device is accessed by writing "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 */
+  unsigned int twelve_byte:1; /* Force 12 byte command length for group 6 & 7 commands  */
+  unsigned int other_flags:31;			/* for future use */
+  unsigned char sense_buffer[16]; /* used only by reads */
+  /* 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 (60*HZ) /* 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
+
+#endif