Re: How to detect if file is in use?

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Re^2: How to detect if file is in use? by gellyfish (Monsignor) on Mar 17, 2005 at 11:45 UTC
I guessed when I wrote Linux::Fuser and looked in `/proc/*/fd` and found all the file descriptors that had the same inode as the file I was interested in. Having just looked the source of fuser it appears it was a good guess ;-) /J\	[reply] [d/l]
Re^3: How to detect if file is in use? by thor (Priest) on Mar 17, 2005 at 12:45 UTC
Is this a proper assumption? From what I know, inodes are unique based on filesystem, not on a system-wide basis. That is to say that you could have two file systems with two different files that have the same inode number. thor `Feel the white light, the light within Be your own disciple, fan the sparks of will For all of us waiting, your kingdom will come`	[reply]
Re^4: How to detect if file is in use? by gellyfish (Monsignor) on Mar 17, 2005 at 13:13 UTC
Yes you are correct and I over-simplified, Linux::Fuser indeed does compare the device numbers of the file as well as the inode number: `if (my @statinfo = stat $fd) { if (($dev == $statinfo[0]) && ($ino == $statinfo[1]) ) {` [download] You had me worried there for a second ;-) /J\	[reply] [d/l]
Re^4: How to detect if file is in use? by betterworld (Curate) on Mar 17, 2005 at 12:59 UTC
~~I don't think gellyfish said anything about inodes.~~ If you look into /proc/*/fd/, you will find symlinks to all the files opened by the programs. By using readlink(), you can find out the path of those files (not the inodes).	[reply]
Re^5: How to detect if file is in use? by thor (Priest) on Mar 17, 2005 at 16:18 UTC
Re^6: How to detect if file is in use? by gellyfish (Monsignor) on Mar 17, 2005 at 16:56 UTC
Re^6: How to detect if file is in use? by betterworld (Curate) on Mar 18, 2005 at 02:02 UTC
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Re^2: How to detect if file is in use? by blazar (Canon) on Mar 17, 2005 at 11:40 UTC
How does fuser do it? I wish I knew. The manpage mentions /proc, maybe that could be relevant, but then if I knew I wouldn't have asked. And no, I've not checked the src, as it is C, I suppose, and I don't know much C any more...	[reply]
Re^3: How to detect if file is in use? by gellyfish (Monsignor) on Mar 17, 2005 at 11:47 UTC
But you can check the source of Linux::Fuser which works in the same way as I noted ~~above~~ in Re^2: How to detect if file is in use?. /J\	[reply]