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authorThomas Schwinge <thomas@schwinge.name>2010-07-24 10:42:08 +0200
committerThomas Schwinge <thomas@schwinge.name>2010-07-24 10:42:08 +0200
commit95f6c960295ee7229c7e7f54575918b46a7310af (patch)
tree7655ca6e23ac802be5aa301ad58759b2d9b00056 /open_issues/translate_fd_or_port_to_file_name.mdwn
parentf2dba1529b1b3ad3163316e8acc7a383ff7b0e7d (diff)
open_issues/translate_fd_or_port_to_file_name: New.
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+[[!meta copyright="Copyright © 2010 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_glibc open_issue_hurd]]
+
+\#hurd, freenode, June (?) 2010
+
+ <pochu> is there a way (POSIX or Hurdish) to get the corresponding file name for a fd or a hurd port?
+ <marcusb> there is a way
+ <pochu> marcusb: which one would that be?
+ <marcusb> I forgot
+ <marcusb> there is an implementation in libc
+ <marcusb> realpath has a similar job
+ <marcusb> but that's not what I mean
+ <marcusb> pochu: maybe I am misremembering. But it was something where you keep looking up .. and list that directory, looking for the node with the ID of the node you had .. for
+ <marcusb> maybe it works only for directories
+ <marcusb> yeah
+ <marcusb> pochu: check the getcwd() implementation of libc
+ <marcusb> sysdeps/mach/hurd/getcwd.c
+ <marcusb> _hurd_canonicalize_directory_name_internal 
+ * pochu looks
+ <pochu> marcusb: interesting
+ <pochu> though that is for dirs, and doesn't seem to be extensible to files, as you cannot lookup for ".." under a file
+ <marcusb> right
+ <pochu> oh you already said that :)
+ <marcusb> actually, I am not sure that's correct
+ <marcusb> it's probably correct, but there is no reason why looking .. up on a file couldn't return the directory it's contianed in
+ <pochu> I don't know the interfaces or the Hurd internals very well yet, but it would look strange to me if you could do that
+ <marcusb> the hurd is strange
+ <pochu> it sounds like if you could `ls getcwd.c/..` to get sysdeps/mach/hurd/ :-)
+ <marcusb> yep
+ <pochu> ok. interesting
+ <marcusb> you wouldn't find "ls foo.zip/.." very strange, wouldn't you?
+ <pochu> I guess not if `ls foo.zip` listed the contents of foo.zip
+ <marcusb> there you go
+ <marcusb> or the other way round: would you be surprised if "cat somedir" would work?
+ <pochu> I think so. if it did, what would it do?
+ <marcusb> originally, cat dir would list the directory content!
+ <marcusb> in the old unix times
+ <pochu> I was surprised the first time I typed `vi somedir` by accident
+ <marcusb> and some early BSDs
+ * pochu feels young :-)
+ <marcusb> he don't worry, I didn't see those times either
+ <marcusb> technically, files and directories are implemented in the same way in the hurd, they both are objects implementing the fs.defs interface
+ <marcusb> which combines file and directory operations
+ <marcusb> of course, files and directories implement those functions differently
+ <antrik> marcusb: do you know why this behavior (cat on directories) was changed?