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+.\" $NetBSD: libperfuse.3,v 1.7 2019/09/08 11:34:56 uwe Exp $
+.\"
+.\" Copyright (c) 2010 Emmanuel Dreyfus. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd January 23, 2019
+.Dt LIBPERFUSE 3
+.Os
+.Sh NAME
+.Nm perfuse_mount ,
+.Nm perfuse_open
+.Nd Request a
+.Xr puffs 3
+mount from
+.Xr perfused 8
+.Sh LIBRARY
+.Lb libperfuse
+.Sh SYNOPSIS
+.In perfuse.h
+.Ft int
+.Fn perfuse_mount "const char *source" "const char *dir" "const char *filesystemtype" "long int mountflags" "void *data"
+.Ft int
+.Fn perfuse_open "const char *path" "int flags"
+.Sh DESCRIPTION
+.Fn perfuse_mount
+sends a mount request to
+.Xr perfused 8 .
+It is intended as a drop-in replacement for
+.Xr mount 2
+for FUSE file systems daemons and libraries, so that they can work with
+.Xr perfused 8 .
+.Pp
+The function prototype mimics Linux's
+.Xr mount 2 ,
+with the following arguments:
+.Bl -tag -width Ar
+.It Ar source
+The source file system that will appear in
+.Xr df 1
+and
+.Xr mount 8
+listings.
+Defaults to
+.Pa /dev/fuse
+if
+.Dv NULL .
+.It Ar dir
+The file system mount point.
+.It Ar filesystemtype
+The file system type, as displayed by
+.Xr df 1
+and
+.Xr mount 8 .
+Defaults to
+.Qq Li fuse
+if
+.Dv NULL .
+.It Ar mountflags
+This contains the same value as a
+.Xr mount 2
+.Ar flags
+argument.
+.It Ar data
+This contains the same value as a
+.Xr mount 2
+.Ar data
+argument.
+.El
+.Pp
+.Fn perfuse_open
+is a drop-in replacement for the
+.Xr open 2
+system call where
+.Pa /dev/fuse
+is used.
+If
+.Ar path
+is different than
+.Pa /dev/fuse ,
+.Fn perfuse_open
+handles control to the regular
+.Xr open 2 .
+.Sh RETURN VALUES
+.Fn perfuse_mount
+returns a file descriptor to the
+.Pa /dev/fuse
+socket on success, and causes exit on failure.
+.Sh ENVIRONMENT
+.Bl -tag -width Ev
+.It Ev PERFUSE_OPTIONS
+Comma-separated values controlling the usage of some FUSE methods.
+Allowed values are
+.Li enable_access ,
+.Li disable_access ,
+.Li enable_creat ,
+.Li disable_creat .
+.It Ev PERFUSE_BUFSIZE
+Set the socket buffer sizes used for communication with the filesystem.
+This should be raised as operation throughput requires it.
+Default is
+.Li 2162688
+bytes, which is enough to queue 16 FUSE packets of maximum 132 kB length.
+.El
+.\".Sh ERRORS
+.\".Fn perfuse_mount
+.\"will fail when one of the following occurs:
+.\".Bl -tag -width Er
+.\".El
+.Sh SEE ALSO
+.Xr df 1 ,
+.Xr mount 2 ,
+.Xr open 2 ,
+.Xr puffs 3 ,
+.Xr mount 8 ,
+.Xr perfused 8
+.Sh AUTHORS
+The program was written by
+.An Emmanuel Dreyfus
+.Aq manu@NetBSD.org .