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.\" $OpenBSD: fuse_session_loop.3,v 1.1 2026/02/01 20:02:58 helg Exp $
.\"
.\" Copyright (c) 2026 Helg Bredow <helg@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: February 1 2026 $
.Dt FUSE_SESSION_LOOP 3
.Os
.Sh NAME
.Nm fuse_session_loop ,
.Nm fuse_session_process ,
.Nm fuse_session_add_chan ,
.Nm fuse_session_remove_chan ,
.Nm fuse_session_exit ,
.Nm fuse_session_exited ,
.Nm fuse_session_reset
.Nd manage lifecycle and event handling for a FUSE session
.Sh SYNOPSIS
.Lb fuse
.In fuse_lowlevel.h
.Ft int
.Fn fuse_session_loop "struct fuse_session *se"
.Ft void
.Fo fuse_session_process
.Fa "struct fuse_session *se"
.Fa "struct fuse_chan *ch"
.Fa "const struct fuse_buf *buf"
.Fa "struct fuse_buf *outbuf"
.Fc
.Ft void
.Fo fuse_session_add_chan
.Fa "struct fuse_session *se"
.Fa "struct fuse_chan *ch"
.Fc
.Ft void
.Fn fuse_session_remove_chan "struct fuse_chan *ch"
.Ft void
.Fn fuse_session_exit "struct fuse_session *se"
.Ft int
.Fn fuse_session_exited "struct fuse_session *se"
.Ft void
.Fn fuse_session_reset "struct fuse_session *se"
.Sh DESCRIPTION
These functions are part of the FUSE low-level API and are used to manage the
lifecycle, communication channel, and event processing of a FUSE session.
.Pp
A fuse_session is created with
.Xr fuse_lowlevel_new 3 .
.Bl -tag -width Ds
.It Fn fuse_session_loop "se"
Run the main event loop for the session
.Fa se .
This function blocks and processes incoming requests until
.Fn fuse_session_exit
is called.
.It Fn fuse_session_process "se" "buf" "bufsize" "ch"
Process a single buffer
.Fa buf
received from channel
.Fa ch
in the session
.Fa se .
If ch is
.Dv NULL
then the channel added to the session is used instead.
Used for manual request handling outside of the main loop.
.It Fn fuse_session_add_chan "se" "ch"
Add the communication channel
.Fa ch
to the session
.Fa se .
Channels are used to receive requests from the kernel.
A session may be associated with only one channel at a time, and a channel
may be associated with only one session at a time.
.It Fn fuse_session_remove_chan "ch"
Remove the channel
.Fa ch
from its associated session.
.It Fn fuse_session_exit "se"
Signal the session
.Fa se
to exit its event loop.
This does not destroy the session or unmount the filesystem.
.It Fn fuse_session_reset "se"
Reset the session
.Fa se
to a non-exited state, allowing the loop to be restarted.
.El
.Sh RETURN VALUES
.Fn fuse_session_loop
returns 0 on success or -1 on failure.
.Pp
.Fn fuse_session_exited
Returns non-zero if
.Fn fuse_session_exit
has been called and the session
.Fa se
is marked for termination.
.Sh SEE ALSO
.Xr fuse_chan_fd 3 ,
.Xr fuse_lowlevel_new 3 ,
.Xr fuse_mount 3
.Sh STANDARDS
These library functions conform to FUSE 2.6.
.Sh HISTORY
These functions have been available since
.Ox 7.9 .
.Sh AUTHORS
.An Helg Bredow Aq Mt helg@openbsd.org
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