Pawel Jakub Dawidek
nick at garage.freebsd.pl
Sun Aug 24 02:01:18 PDT 2003
On Sat, Aug 23, 2003 at 07:54:45PM -0700, Tim Kientzle wrote:
+> I'm working on some archiving programs and need to (for various
+> reasons) keep track of a very large number of files so that I
+> can revisit them at the end of the operation. For example,
+> on extract, I need to set directory access times and permissions
+> after the complete extract is finished, which requires me to
+> record every created directory. (No, there is no way around
+> this short of re-scanning the entire archive a second
+> time, which is impractical at best.)
+> Right now, I'm storing the full pathname of each such
+> file, but that is taking up a lot of memory, so I'm looking
+> for a more compact approach. It occurred to me that
+> the device number/inode (as returned by stat(2)) is another
+> way to uniquely identify a file. As it turns out, I need to
+> stat() everything anyway, so collecting such identifiers is easy.
+> But, I can't find any system calls that actually use this information.
+> Question: Are there any system calls that allow you to
+> access/modify a file based only on the device number/inode number?
Check getfh(2)/fhopen(2) syscall if you are root.
Pawel Jakub Dawidek pawel at dawidek.net
UNIX Systems Programmer/Administrator http://garage.freebsd.pl
Am I Evil? Yes, I Am! http://cerber.sourceforge.net
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