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authorArne Babenhauserheide <arne_bab@web.de>2011-12-19 06:28:18 +0100
committerArne Babenhauserheide <arne_bab@web.de>2011-12-19 06:28:18 +0100
commit83a6603ed188d746e2871decf85939fb7975b979 (patch)
tree5f671db8fa7e3828322a4d4b1b9cdce9b4bb6ac4 /open_issues/mig_portable_rpc_declarations.mdwn
parentd8b7944e910af3fdc1109846698d67738761f85a (diff)
parent6c057cff39ff782e9155c07eee44884cd9c48c9c (diff)
Merge branch 'master' of flubber:~hurd-web/hurd-web
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+[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+[[!tag open_issue_mig]]
+
+
+# IRC, freenode, #hurd, 2011-11-14
+
+ <braunr> also, what's the best way to deal with types such as
+ <braunr> type cache_info_t = struct[23] of integer_t;
+ <braunr> whereas cache_info_t contains longs, which are obviously not
+ integer-wide on 64-bits processors
+ <braunr> ?
+ <youpi> you mean, to port mach to 64bit?
+ <braunr> no, to make the RPC declaration portable
+ <braunr> just in case :)
+ <youpi> refine integer_t into something more precise
+ <youpi> such as size_t, off_t, etc.
+ <braunr> i can't use a single line then
+ <braunr> struct cache_info contains ints, vm_size_t, longs
+ <braunr> should i just use the maximum size it can get ?
+ <braunr> or declare two sizes depending on the word size ?
+ <youpi> well, I'd say three
+ <braunr> youpi: three ?
+ <youpi> the ints, the vm_size_ts, and the longs
+ <braunr> youpi: i don't get it
+ <braunr> youpi: how would i write it in mig language ?
+ <youpi> I don't know the mig language
+ <braunr> me neither :)
+ <youpi> but I'd say don't lie
+ <braunr> i just see struct[23] of smething
+ <braunr> the original zone_info struct includes both integer_t and
+ vm_size_t, and declares it as
+ <braunr> type zone_info_t = struct[9] of integer_t;
+ <braunr> in its mig defs file
+ <braunr> i don't have a good example to reuse
+ <youpi> which is lying
+ <braunr> yes
+ <braunr> which is why i was wondering if mach architects themselves
+ actually solved that problem :)
+ <braunr> "There is no way to specify the fields of a
+ <braunr> C structure to MIG. The size and type-desc are just used to
+ give the size of
+ <braunr> the structure.
+ <braunr> "
+ <braunr> well, this sucks :/
+ <braunr> well, i'll do what the rest of the code seems to do, and let it
+ rot until a viable solution is available
+ <antrik> braunr: we discussed the problem of expressing structs with MIG in
+ the libburn thread
+ <antrik> (which I still need to follow up on... [sigh])