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+.\"	$NetBSD: statvfs.2,v 1.7 2020/04/04 12:57:26 nia 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.
+.\"
+.\"	@(#)statfs.2	8.5 (Berkeley) 5/24/95
+.\"
+.Dd April 14, 2004
+.Dt STATVFS 2
+.Os
+.Sh NAME
+.Nm statvfs ,
+.Nm statvfs1 ,
+.Nm fstatvfs ,
+.Nm fstatvfs1
+.Nd get file system statistics
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/statvfs.h
+.Ft int
+.Fn statvfs "const char *path" "struct statvfs *buf"
+.Ft int
+.Fn statvfs1 "const char *path" "struct statvfs *buf" "int flags"
+.Ft int
+.Fn fstatvfs "int fd" "struct statvfs *buf"
+.Ft int
+.Fn fstatvfs1 "int fd" "struct statvfs *buf" "int flags"
+.Sh DESCRIPTION
+.Fn statvfs
+and
+.Fn statvfs1
+return information about a mounted file system.
+.Fa path
+is the path name of any file within the mounted file system.
+.Fa buf
+is a pointer to a
+.Nm statvfs
+structure defined in
+.Xr statvfs 5 .
+.Pp
+.Fn fstatvfs
+and
+.Fn fstatvfs1
+return the same information about an open file referenced by descriptor
+.Fa fd .
+.Pp
+The
+.Fn statvfs1
+and
+.Fn fstatvfs1
+functions allow an extra
+.Fa flags
+argument which can be
+.Dv ST_WAIT
+and
+.Dv ST_NOWAIT .
+When
+.Dv ST_NOWAIT
+is specified, then only cached statistics are returned.
+This can result in significant savings on non-local file systems, where
+gathering statistics involves a network communication.
+.Pp
+The
+.Fn statvfs
+and
+.Fn fstatvfs
+calls are equivalent to the respective
+.Fn statvfs1
+and
+.Fn fstatvfs1
+calls with
+.Dv ST_WAIT
+specified as the
+.Fa flags
+argument.
+.Sh RETURN VALUES
+Upon successful completion, a value of 0 is returned.
+Otherwise, \-1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn statvfs
+and
+.Fn statvfs1
+fail if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix of
+.Fa path
+is not a directory.
+.It Bq Er ENAMETOOLONG
+The length of a component of
+.Fa path
+exceeds
+.Brq Dv NAME_MAX
+characters, or the length of
+.Fa path
+exceeds
+.Brq Dv PATH_MAX
+characters.
+.It Bq Er ENOENT
+The file referred to by
+.Fa path
+does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix of
+.Fa path .
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating
+.Fa path .
+.It Bq Er EFAULT
+.Fa buf
+or
+.Fa path
+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
+.Pp
+.Fn fstatvfs
+and
+.Fn fstatvfs1
+fail if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er EBADF
+.Fa fd
+is not a valid open file descriptor.
+.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 5
+.Sh STANDARDS
+The
+.Fn statvfs
+and
+.Fn fstatvfs
+functions conform to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn statvfs ,
+.Fn statvfs1 ,
+.Fn fstatvfs ,
+and
+.Fn fstatvfs1
+functions first appeared in
+.Nx 3.0
+to replace
+the
+.Fn statfs
+family of functions which first appeared in
+.Bx 4.4 .