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My system is CentOS.

I'm trying to get this by listing fs.inotify variables via sysctl call (sysctl fs.inotify), but didn't found anything useful, only variables to specify limits.

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I don't think there are any provisions for finding the number of established watches, just from looking at man inotify(7). The process that establishes a watch can keep track of it, but that's it. – tink Mar 17 '13 at 20:39

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