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+.\"	$NetBSD: getvfsstat.2,v 1.4 2021/03/27 23:35:37 dholland Exp $
+.\"
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"	@(#)getvfsstat.2	8.3 (Berkeley) 5/25/95
+.\"
+.Dd March 27, 2021
+.Dt GETVFSSTAT 2
+.Os
+.Sh NAME
+.Nm getvfsstat
+.Nd get list of all mounted file systems
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/statvfs.h
+.Ft int
+.Fn getvfsstat "struct statvfs *buf" "size_t bufsize" "int flags"
+.Sh DESCRIPTION
+.Fn getvfsstat
+returns information about all mounted file systems.
+.Fa buf
+is a pointer to an array of
+.Nm statvfs
+structures defined in
+.Xr statvfs 5 .
+.Pp
+The buffer is filled with an array of
+.Fa statvfs
+structures, one for each mounted file system
+up to the size specified by
+.Fa bufsize .
+.Pp
+If
+.Fa buf
+is given as
+.Dv NULL ,
+.Fn getvfsstat
+returns just the number of mounted file systems.
+.Pp
+Normally
+.Fa flags
+should be specified as
+.Dv ST_WAIT .
+If
+.Fa flags
+is set to
+.Dv ST_NOWAIT ,
+.Fn getvfsstat
+will return the information it has available without requesting
+an update from each file system.
+Thus, some of the information will be out of date, but
+.Fn getvfsstat
+will not block waiting for information from a file system that is
+unable to respond.
+.Pp
+Note that
+.Fa bufsize
+is the size of the buffer in bytes, not the count of structures that
+will fit in it, and the return value is the count of structures, not
+the size.
+.Sh RETURN VALUES
+Upon successful completion, the number of
+.Fa statvfs
+structures is returned.
+Otherwise, \-1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn getvfsstat
+fails if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+.Fa buf
+points to an invalid address.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr statvfs 2 ,
+.Xr getmntinfo 3 ,
+.Xr fstab 5 ,
+.Xr mount 8
+.Sh HISTORY
+The
+.Fn getvfsstat
+function first appeared in
+.Nx 3.0
+to replace
+.Fn getfsstat
+which appeared in
+.Bx 4.4 .