1 files changed, 76 insertions, 0 deletions
diff --git a/sanei/sanei_DomainOS.h b/sanei/sanei_DomainOS.h
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+++ b/sanei/sanei_DomainOS.h
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+/*
+This file defines the structure of the communication area used by the
+SANE Domain/OS server.  This area must be initialized before the server
+is invoked with a path to the area.
+
+To send an open command to the server, follow these steps:
+    1) Obtain a mutex lock on CommandLock.
+    2) Fill in opcode and open_path variables.
+    3) Advance the CommandAvailable EC.
+    4) Wait for the CommandAccepted EC to advance.
+    5) Get the CommandStatus, which has the Domain/OS completion status.
+       Get the fd value, which will be used for subsequent commands.
+       Use the open_path variable to map the data section for the device.
+    6) Release the CommandLock mutex lock.
+
+To send a close command to the server, follow these steps:
+    1) Obtain a mutex lock on CommandLock.
+    2) Fill in appropriate Command Data Areas.
+    3) Advance the CommandAvailable EC.
+    4) Wait for the CommandAccepted EC to advance.
+    5) Get the CommandStatus, which has the Domain/OS completion status.
+    6) Release the CommandLock mutex lock.
+
+To send an enter command to the server, follow these steps:
+    1) Obtain a mutex lock on CommandLock.
+    2) Fill in the fd field.
+    3) Advance the CommandAvailable EC.
+    4) Wait for the CommandAccepted EC to advance.
+    5) Get the handle for the command.
+    5) Release the CommandLock mutex lock.
+
+*/
+
+
+#ifndef DomainSenseSize
+
+/* Amount of data in a sense request */
+#define DomainSenseSize 18
+
+/* Maximum amound of data in a transfer, per Domain/OS SCSI spec */
+#define DomainMaxDataSize (32 * 1024)
+
+/* Timeout for ec2_$wait calls, in 1/4 second intervals */
+#define DomainECWaitConstant 120
+
+typedef enum {Open, Close, Enter, Exit} DomainOSOpCode;
+
+struct DomainServerCommon
+   {
+   /* Basic communication/synchronization items */
+   ec2_$eventcount_t CommandAvailable;
+   ec2_$eventcount_t CommandAccepted;
+   ec2_$eventcount_t ResultReady;
+   ec2_$eventcount_t ResultAccepted;
+   mutex_$lock_rec_t CommandLock;
+   mutex_$lock_rec_t ResultLock;
+
+   /* Command Data Areas - locked by CommandLock */
+   DomainOSOpCode opcode;
+   int fd;
+   name_$long_pname_t open_path;
+   status_$t CommandStatus;
+   scsi_$status_t SCSIStatus;
+   unsigned long CommandHandle;
+   linteger cdb_size;
+   scsi_$cdb_t cdb;
+   scsi_$direction_t direction;
+   size_t dst_size;
+   size_t buf_size;
+
+   /* Result data areas */
+   status_$t status;
+   };
+
+#endif /*DomainSenseSize*/
+