L4Re/departure

Annotated libsystypes/idl/pipe.idl

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14 months ago Paul Boddie file changeset files shortlog Added the retention of the current data position in pipe endpoints, allowing endpoints to be transferred to other programs and initialised appropriately. Renamed the populated_size parameter in the flush operation to indicate that a more general position is being sent, this being a populated size in a writing context and the current reading position in a reading context.
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#include <systypes/base.h>  /* offset_t */
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/* A pipe interface providing access to shared memory. */
 
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interface Pipe
 
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{
 
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  /* Obtain details of the current region of shared memory. */
 
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  [opcode(16)] void current_region(inout offset_t position, out offset_t populated_size, out offset_t size);
 
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  /* Advance to the next region of shared memory, indicating and obtaining the
 
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     populated limit of the region and obtaining the region size. */
 
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  [opcode(17)] void next_region(inout offset_t populated_size, out offset_t size);
 
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  /* Return whether the pipe is closed or partly closed. */
 
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  [opcode(22)] void closed(out int closed);
 
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};