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+.\"	$OpenBSD: statvfs.3,v 1.9 2022/02/11 15:11:35 millert Exp $
+.\"	$NetBSD: statfs.2,v 1.10 1995/06/29 11:40:48 cgd 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	8.3 (Berkeley) 2/11/94
+.\"
+.Dd $Mdocdate: February 11 2022 $
+.Dt STATVFS 3
+.Os
+.Sh NAME
+.Nm statvfs ,
+.Nm fstatvfs
+.Nd get file system statistics
+.Sh SYNOPSIS
+.In sys/statvfs.h
+.Ft int
+.Fn statvfs "const char *path" "struct statvfs *buf"
+.Ft int
+.Fn fstatvfs "int fd" "struct statvfs *buf"
+.Sh DESCRIPTION
+.Fn statvfs
+returns 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 as follows:
+.Bd -literal
+struct statvfs {
+        unsigned long f_bsize;    /* file system block size */
+        unsigned long f_frsize;   /* fundamental file system block size */
+        fsblkcnt_t    f_blocks;   /* number of blocks (unit f_frsize) */
+        fsblkcnt_t    f_bfree;    /* free blocks in file system */
+        fsblkcnt_t    f_bavail;   /* free blocks for non-root */
+        fsfilcnt_t    f_files;    /* total file inodes */
+        fsfilcnt_t    f_ffree;    /* free file inodes */
+        fsfilcnt_t    f_favail;   /* free file inodes for non-root */
+        unsigned long f_fsid;     /* file system id */
+        unsigned long f_flag;     /* bit mask of f_flag values */
+        unsigned long f_namemax;  /* maximum filename length */
+};
+
+#define ST_RDONLY     0x0001UL    /* read-only filesystem */
+#define	ST_NOSUID     0x0002UL    /* nosuid flag set */
+.Ed
+.Pp
+The fields of type
+.Vt fsblkcnt_t
+are reported in units of
+.Fa f_frsize .
+.Pp
+.Fn fstatvfs
+returns the same information about an open file referenced by descriptor
+.Fa fd .
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+.Fn statvfs
+fails 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
+A component of a pathname exceeded
+.Dv NAME_MAX
+characters, or an entire pathname (including the terminating NUL)
+exceeded
+.Dv PATH_MAX
+bytes.
+.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 I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+.Fn fstatvfs
+fails 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 I/O error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr df 1 ,
+.Xr mount 2 ,
+.Xr stat 2 ,
+.Xr statfs 2
+.Sh STANDARDS
+The
+.Fn statvfs
+and
+.Fn fstatvfs
+functions conform to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn statvfs
+and
+.Fn fstatvfs
+functions first appeared in
+.Ox 4.4 .