Using FUSE in daemon program

[Tomasz Jankowski]

Hello!

I'm working on daemon program for Linux. My program is not a regualr unix
daemon, it works only in user session (starts with GNOME sessions and and
when user logs out). I'm new to FUSE project and have few questions.

Firs of all I need to manually fork my program, so I can't use fuse_main(),
because I handle some things in separated threads (DBus connection, TCP
server etc.), so I want to manually initialize and run fuse loop in
separated thread. Is it possible?

As I read fuse can run in threaded mode? How it work? As I understand in
single thread mode fuse run loop and dispatch all file system requests
(open, read, write) inside this loop right? How does this work for multi
thread mode? Fuse loop dispatch each request in separated thread or what?
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[Michael Raskin-4]

Tomasz Jankowski wrote:
> First of all I need to manually fork my program, so I can't use fuse_main(),
> because I handle some things in separated threads (DBus connection, TCP
> server etc.), so I want to manually initialize and run fuse loop in
> separated thread. Is it possible?

Yes. I recently did lisp bindings (GC uses signals, so no fuse_main for
me), I ended up calling the following functions in the following order
(normal session):

fuse_parse_cmdline (could do without it)
fuse_mount
fuse_new
fuse_opt_free_args
fuse_get_session
fuse_chan_bufsize
fuse_session_exited (loop condition)
fuse_chan_recv
fuse_session_process
fuse_unmount
fuse_destroy

These functions are enough to emulate fuse_main. I doubt there is a
shorter non-deprecated way for my task. I guess your requirements are
similar: FUSE calls should not manage threads in any way.

> As I read fuse can run in threaded mode? How it work? As I understand in
> single thread mode fuse run loop and dispatch all file system requests
> (open, read, write) inside this loop right? How does this work for multi
> thread mode? Fuse loop dispatch each request in separated thread or what?

Approximately. You don't need it, though. You can pack your
fuse_session_process calls into threads to your heart's pleasure.

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[Goswin von Brederlow-2]

Tomasz Jankowski <tomcioj@...> writes:

> Hello!
>
> I'm working on daemon program for Linux. My program is not a regualr unix
> daemon, it works only in user session (starts with GNOME sessions and and
> when user logs out). I'm new to FUSE project and have few questions.
>
> Firs of all I need to manually fork my program, so I can't use fuse_main(),
> because I handle some things in separated threads (DBus connection, TCP
> server etc.), so I want to manually initialize and run fuse loop in
> separated thread. Is it possible?

Certainly possible but unneccessary.

You can simply start your own threads in the init callback.

> As I read fuse can run in threaded mode? How it work? As I understand in
> single thread mode fuse run loop and dispatch all file system requests
> (open, read, write) inside this loop right? How does this work for multi
> thread mode? Fuse loop dispatch each request in separated thread or what?

Fuse starts a number of threads that all block reading /dev/fuse. Then
as requests come in one of them returns from read and calls the
appropriate callback.

For the exact behaviour compare the single and multi threaded loop in
the source.

MfG
        Goswin

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