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-.\"
-.\" Copyright 2002 Massachusetts Institute of Technology
-.\"
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-.\" granted, provided that both the above copyright notice and this
-.\" permission notice appear in all copies, that both the above
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-.\" supporting documentation, and that the name of M.I.T. not be used
-.\" in advertising or publicity pertaining to distribution of the
-.\" software without specific, written prior permission.  M.I.T. makes
-.\" no representations about the suitability of this software for any
-.\" purpose.  It is provided "as is" without express or implied
-.\" warranty.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
-.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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-.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
-.\" SHALL M.I.T. 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
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-.\"
-.\" $FreeBSD: src/lib/libc/gen/statvfs.3,v 1.7 2003/06/08 10:01:51 charnier Exp $
-.\"
-.Dd July 13, 2002
-.Dt STATVFS 3
-.Os
-.Sh NAME
-.Nm fstatvfs ,
-.Nm statvfs
-.Nd retrieve file system information
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/statvfs.h
-.Ft int
-.Fo fstatvfs
-.Fa "int fildes"
-.Fa "struct statvfs *buf"
-.Fc
-.Ft int
-.Fo statvfs
-.Fa "const char *restrict path"
-.Fa "struct statvfs *restrict buf"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn statvfs
-and
-.Fn fstatvfs
-functions attempt to fill the structure pointed to by
-.Fa buf
-with file system
-statistics, but portable applications must not depend on this.
-Applications must pass a pathname or file descriptor which refers to a
-file on the file system in which they are interested.
-.Pp
-The
-.Vt statvfs
-structure contains the following members:
-.Bl -tag -offset indent -width ".Va f_namemax"
-.It Va f_namemax
-The maximum length in bytes of a file name on this file system.
-Applications should use
-.Xr pathconf 2
-instead.
-.It Va f_fsid
-Not meaningful in this implementation.
-.It Va f_frsize
-The size in bytes of the minimum unit of allocation on this
-file system.
-(This corresponds to the
-.Va f_bsize
-member of
-.Vt "struct statfs" . )
-.It Va f_bsize
-The preferred length of I/O requests for files on this file system.
-(Corresponds to the
-.Va f_iosize
-member of
-.Vt "struct statfs" . )
-.It Va f_flag
-Flags describing mount options for this file system; see below.
-.El
-.Pp
-In addition, there are three members of type
-.Vt fsfilcnt_t ,
-which represent counts of file serial numbers
-.Em ( i.e. ,
-inodes); these are named
-.Va f_files , f_favail ,
-and
-.Va f_ffree ,
-and represent the number of file serial numbers which exist in total,
-are available to unprivileged processes, and are available to
-privileged processes, respectively.
-Likewise, the members
-.Va f_blocks , f_bavail ,
-and
-.Va f_bfree
-(all of type
-.Vt fsblkcnt_t )
-represent the respective allocation-block counts.
-.Pp
-There are two flags defined for the
-.Va f_flag
-member:
-.Bl -tag -offset indent -width ".Dv ST_NOSUID"
-.It Dv ST_RDONLY
-The file system is mounted read-only.
-.It Dv ST_NOSUID
-The semantics of the
-.Dv S_ISUID
-and
-.Dv S_ISGID
-file mode bits
-are not supported by, or are disabled on, this file system.
-.El
-.Sh IMPLEMENTATION NOTES
-The
-.Fn statvfs
-and
-.Fn fstatvfs
-functions are implemented as wrappers around the
-.Fn statfs
-and
-.Fn fstatfs
-functions, respectively.
-Not all the information provided by those functions is made available
-through this interface.
-.Sh RETURN VALUES
-.Rv -std statvfs fstatvfs
-.Sh ERRORS
-The
-.Fn statvfs
-function fails if one or more of the following are true:
-.Bl -tag -width Er
-.It Bq Er EACCES
-Search permission is denied for a component of the path prefix of
-.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.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating
-.Fa path .
-.It Bq Er ENAMETOOLONG
-The length of a component of
-.Fa path
-exceeds 
-.Dv {NAME_MAX}
-characters, or the length of
-.Fa path
-exceeds 
-.Dv {PATH_MAX}
-characters.
-.It Bq Er ENOENT
-The file referred to by
-.Fa path
-does not exist.
-.It Bq Er ENOTDIR
-A component of the path prefix of
-.Fa Path
-is not a directory.
-.El
-.Pp
-The
-.Fn fstatvfs
-functions fails if one or more of the following are true:
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Fa fildes
-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 statfs 2
-.Sh STANDARDS
-The
-.Fn statvfs
-and
-.Fn fstatvfs
-functions conform to
-.St -p1003.1-2001 .
-As standardized, portable applications cannot depend on these functions
-returning any valid information at all.
-This implementation attempts to provide as much useful information as
-is provided by the underlying file system, subject to the limitations
-of the specified data types.
-.Sh AUTHORS
-The
-.Fn statvfs
-and
-.Fn fstatvfs
-manual page was originally written by
-.An Garrett Wollman Aq wollman@FreeBSD.org .