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