7e6cabd06e
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
131 lines
3.6 KiB
Groff
131 lines
3.6 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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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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.\" @(#)getfsstat.2 8.3 (Berkeley) 5/25/95
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.\" $FreeBSD$
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.\"
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.Dd December 27, 2016
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.Dt GETFSSTAT 2
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.Os
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.Sh NAME
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.Nm getfsstat
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.Nd get list of all mounted file systems
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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/ucred.h
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.In sys/mount.h
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.Ft int
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.Fn getfsstat "struct statfs *buf" "long bufsize" "int mode"
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.Sh DESCRIPTION
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The
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.Fn getfsstat
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system call
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returns information about all mounted file systems.
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The
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.Fa buf
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argument
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is a pointer to
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.Vt statfs
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structures, as described in
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.Xr statfs 2 .
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.Pp
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Fields that are undefined for a particular file system are set to -1.
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The buffer is filled with an array of
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.Fa statfs
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structures, one for each mounted file system
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up to the byte count specified by
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.Fa bufsize .
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Note, the
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.Fa bufsize
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argument is the number of bytes that
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.Fa buf
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can hold, not the count of statfs structures it will hold.
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.Pp
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If
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.Fa buf
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is given as NULL,
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.Fn getfsstat
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returns just the number of mounted file systems.
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.Pp
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Normally
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.Fa mode
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should be specified as
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.Dv MNT_WAIT .
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If
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.Fa mode
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is set to
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.Dv MNT_NOWAIT ,
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.Fn getfsstat
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will return the information it has available without requesting
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an update from each file system.
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Thus, some of the information will be out of date, but
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.Fn getfsstat
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will not block waiting for information from a file system that is
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unable to respond.
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It will also skip any file system that is in the process of being
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unmounted, even if the unmount would eventually fail.
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.Sh RETURN VALUES
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Upon successful completion, the number of
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.Fa statfs
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structures is returned.
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Otherwise, -1 is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn getfsstat
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system call
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fails if one or more of the following are true:
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.Bl -tag -width Er
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.It Bq Er EFAULT
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The
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.Fa buf
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argument
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points to an invalid address.
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.It Bq Er EINVAL
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.Fa mode
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is set to a value other than
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.Dv MNT_WAIT
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or
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.Dv MNT_NOWAIT .
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.It Bq Er EIO
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An
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.Tn I/O
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error occurred while reading from or writing to the file system.
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.El
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.Sh SEE ALSO
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.Xr statfs 2 ,
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.Xr fstab 5 ,
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.Xr mount 8
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.Sh HISTORY
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The
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.Fn getfsstat
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system call first appeared in
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.Bx 4.4 .
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