fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
118 lines
3.4 KiB
Groff
118 lines
3.4 KiB
Groff
.\" Copyright (c) 1995
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)kvm_getvfsbyname.3 8.3 (Berkeley) 5/4/95
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.\" $FreeBSD$
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.\"
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.Dd August 30, 2016
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.Dt GETVFSBYNAME 3
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.Os
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.Sh NAME
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.Nm getvfsbyname
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.Nd get information about a file system
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/mount.h
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.Ft int
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.Fn getvfsbyname "const char *name" "struct xvfsconf *vfc"
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.Sh DESCRIPTION
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The
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.Fn getvfsbyname
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function provides access to information about a
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file system module that is configured in the kernel.
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If successful,
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the requested file system
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.Fa xvfsconf
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is returned in the location pointed to by
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.Fa vfc .
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The fields in a
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.Dq Li struct xvfsconf
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are defined as follows:
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.Pp
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.Bl -tag -compact -width vfc_refcount
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.It vfc_name
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the name of the file system
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.It vfc_typenum
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the file system type number assigned by the kernel
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.It vfc_refcount
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the number of active mount points using the file system
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.It vfc_flags
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flag bits, as described below
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.El
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.Pp
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The flags are defined as follows:
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.Pp
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.Bl -tag -width VFCF_DELEGADMIN -compact
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.It Dv VFCF_STATIC
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statically compiled into kernel
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.It Dv VFCF_NETWORK
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may get data over the network
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.It Dv VFCF_READONLY
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writes are not implemented
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.It Dv VFCF_SYNTHETIC
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data does not represent real files
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.It Dv VFCF_LOOPBACK
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aliases some other mounted FS
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.It Dv VFCF_UNICODE
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stores file names as Unicode
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.It Dv VFCF_JAIL
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can be mounted from within a jail if
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.Va security.jail.mount_allowed
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sysctl is set to
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.Dv 1
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.It Dv VFCF_DELEGADMIN
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supports delegated administration if
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.Va vfs.usermount
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sysctl is set to
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.Dv 1
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.El
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.Sh RETURN VALUES
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.Rv -std getvfsbyname
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.Sh ERRORS
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The following errors may be reported:
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.Bl -tag -width Er
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.It Bq Er ENOENT
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The
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.Fa name
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argument
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specifies a file system that is unknown or not configured in the kernel.
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.El
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.Sh SEE ALSO
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.Xr jail 2 ,
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.Xr mount 2 ,
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.Xr sysctl 3 ,
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.Xr jail 8 ,
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.Xr mount 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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A variant of the
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.Fn getvfsbyname
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function first appeared in
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.Fx 2.0 .
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