epoll with sshfs

[PAtrick Gerber]

Hello all,

I am using sshfs to mount on the local machine a part of the sysfs of a remote computer. I could watch some parameters from the remote computer easily.

On the remote computer I use epoll to watch some files of sysfs. I would like to do the same from the local computer on the sshfs mounted part of the remote sysfs. But unfortunately, epoll doesn't work on file from sshfs...

Do you have any idea why and how I could use epoll to watch distant file ?

Thanks in advance for any help

Patrick


     

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[Goswin von Brederlow-2]

Patrick <kpa_info@...> writes:

> Hello all,
>
> I am using sshfs to mount on the local machine a part of the sysfs of a remote computer. I could watch some parameters from the remote computer easily.
>
> On the remote computer I use epoll to watch some files of sysfs. I would like to do the same from the local computer on the sshfs mounted part of the remote sysfs. But unfortunately, epoll doesn't work on file from sshfs...
>
> Do you have any idea why and how I could use epoll to watch distant file ?
>
> Thanks in advance for any help
>
> Patrick

/usr/include/fuse/fuse.h

        /**
         * Poll for IO readiness events
         *
         * Note: If @ph is non-NULL, the client should notify
         * when IO readiness events occur by calling
         * fuse_notify_poll() with the specified @ph.
         *
         * Regardless of the number of times poll with a non-NULL @ph
         * is received, single notification is enough to clear all.
         * Notifying more times incurs overhead but doesn't harm
         * correctness.
         *
         * The callee is responsible for destroying @ph with
         * fuse_pollhandle_destroy() when no longer in use.
         *
         * Introduced in version 2.8
         */
        int (*poll) (const char *, struct fuse_file_info *,
                     struct fuse_pollhandle *ph, unsigned *reventsp);

You would need to have a new enough kernel and libfuse and then add a
callback for this to sshfs. The code would then have to run epoll or
inotify on the remote site.

I'm not sure sshfs has something running on the remote site that could
do that. You have to look at the implementation for that.

MfG
        Goswin

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