Ok apparently was the fault to use an uppercase "Y" instead of a lowercase 
"y" ...



Am Freitag, 31. März 2017 16:58:09 UTC+2 schrieb Fabian B:
>
> I'm trying to use fanotify 
> <http://man7.org/linux/man-pages/man7/fanotify.7.html> on Android and 
> like to archive that with an executable file (compiled with the ndk). I'm 
> using fsmon <https://github.com/nowsecure/fsmon> (small application which 
> calls the fanotify systemcall) to start the monitor. But on executing the 
> file (on a rooted device as root) I'm getting following error:
> generic_x86:/data/local/tmp # ./fsmon -B fanotify /storage/emulated/0/
> fanotify_init: Function not implemented
>
> fanotify is available in kernel version > 2.6.37 (which is shipped in 
> Android 5+).
>
> I had tried it on a x86-emulator (Android 7) and on a Samsung I9300 
> armeabi-v7a (Android 6) with CM13 (both rooted). Kernel version of the x86 
> emulator: 3.4.67+ and of the Samsung device: 3.0.101-CM-g9c98896
>
> Then I had a look into the x86-emulator goldfish kernel files in 
> /goldfish/fs/notify/fanotify/Kconfig:
> config FANOTIFY
>     bool "Filesystem wide access notification"
>     select FSNOTIFY
>     select ANON_INODES
>     default n
>     ---help---
>        Say Y here to enable fanotify suport.  fanotify is a file access
>        notification system which differs from inotify in that it sends
>        an open file descriptor to the userspace listener along with
>        the event.
>
>
>        If unsure, say Y.
>
>
> config FANOTIFY_ACCESS_PERMISSIONS
>     bool "fanotify permissions checking"
>     depends on FANOTIFY
>     depends on SECURITY
>     default n
>     ---help---
>        Say Y here is you want fanotify listeners to be able to make 
> permissions
>        decisions concerning filesystem events.  This is used by some 
> fanotify
>        listeners which need to scan files before allowing the system 
> access to
>        use those files.  This is used by some anti-malware vendors and by 
> some
>        hierarchical storage managent systems.
>
>
>        If unsure, say N.
>
> So, I set both to Y, make clean and recompile the kernel - but same 
> problem like before.. Have I overlooked something?
>

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