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IPC (edit)

Revision as of 01:48, 27 April 2014

384 bytes added ,  01:48, 27 April 2014
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Translate parameters are modified/translated transparently by the kernel. They are used to transfer handles/buffers between the different processes.
 
Translate parameters are modified/translated transparently by the kernel. They are used to transfer handles/buffers between the different processes.
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Translate parameters comes in pairs of two words, one descriptor and one value.
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The type of parameter is described by the bits 1-3 in the translation descriptor. Parameter types accepted by the kernel are: 0, 1, (2?), 5, 6, 7.
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The number of parameters covered by a descriptor is type-dependent:
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Type 0:
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    length = (desc >> 26) + 1
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Type 1, (2?), 5, 6, 7:
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    length = 1
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Type 0 does the following:
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if desc & 0x30 == 0x20:
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  write process id to value
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else:
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  translate handle
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  if desc & 0x30 == 0x10:
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    close handle for caller
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