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NetBSD 6.1.5 - man page for perfused (netbsd section 8)

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PERFUSED(8)			   BSD System Manager's Manual			      PERFUSED(8)

NAME
     perfused -- PUFFS Enabled Relay to FUSE Daemon

SYNOPSIS
     perfused [-fs] [-d types] [-i -fd]

DESCRIPTION
     perfused is a userland daemon implementing the FUSE kernel level API.  It creates a
     /dev/fuse socket for FUSE file system daemons to connect to.  perfused takes care of mount-
     ing the file system using puffs(3).

     When the kernel sends a puffs(3) operation for the mounted file system, perfused will trans-
     late it into a FUSE request, and will send it to the file system daemon through /dev/fuse.
     The FUSE reply will be converted back into a puffs(3) reply and will be relayed to the ker-
     nel.

     FUSE file system daemons must be modified so that they request perfused to perform the
     mount(2) system call instead of doing it on their own.  This is done by replacing mount(2)
     and the open(2) calls for /dev/fuse with perfuse_mount() and perfuse_open(), respectively,
     in their sources.	libperfuse(3) must be used at link time.  Most FUSE file system daemons
     use libfuse and will work unmodified, provided the modification is done in libfuse itself .

     The following options are available:

     -d types	 Print additional debug information.  types is a comma-separated list of informa-
		 tion types to print:

		 puffs	 Display PUFFS requests and replies.

		 fuse	 Display FUSE requests and replies.

		 dump	 Dump content of FUSE frames.

		 fh	 Display file handle activity.

		 reclaim
			 Display reclaim activity.

		 readdir
			 Display readdir activity.

		 requeue
			 Display requeue activity.

		 sync	 Display dirty flags and sync operations.

     -f 	 Do not fork, but stay in the foreground.

     -i fd	 Do not open /dev/fuse but use the socket available from the file descriptor fd.
		 This is used when perfused is started from libperfuse(3).

     -s 	 Enable debug output only when receiving SIGINFO.

SIGNALS
     SIGINFO
	     If the -s flag was used, toggle debug output.  Do nothing otherwise.

     SIGUSR1
	     Toggle FUSE operation dump on and off.  When toggling off, the trace is is stored in
	     /var/run/perfuse-xxx.trace (xxx is the filesystem mount point).

ERRORS
     The program logs to the syslog daemon as facility ``daemon''.  For detailed debugging use
     the -d (debug) option.

SEE ALSO
     mount(2), perfuse_mount(3), puffs(4)

AUTHORS
     The program was written by Emmanuel Dreyfus <manu@NetBSD.org>.

BUGS
     When perfused runs in the foreground (using the -f flag), some processes using the FUSE file
     system will sometime hang on 'uvn_fp2'.

BSD					 January 29, 2012				      BSD
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