186 lines
4.9 KiB
Groff
186 lines
4.9 KiB
Groff
.\"
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.\" Copyright 2002 Massachusetts Institute of Technology
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.\"
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.\" Permission to use, copy, modify, and distribute this software and
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.\" its documentation for any purpose and without fee is hereby
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.\" granted, provided that both the above copyright notice and this
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.\" permission notice appear in all copies, that both the above
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.\" copyright notice and this permission notice appear in all
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.\" supporting documentation, and that the name of M.I.T. not be used
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.\" in advertising or publicity pertaining to distribution of the
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.\" software without specific, written prior permission. M.I.T. makes
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.\" no representations about the suitability of this software for any
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.\" purpose. It is provided "as is" without express or implied
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.\" warranty.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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.\" SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.\" 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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.\" $FreeBSD$
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.\"
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.Dd July 13, 2002
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.Dt STATVFS 3
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.Os
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.Sh NAME
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.Nm statvfs ,
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.Nm fstatvfs
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.Nd retrieve filesystem information
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/statvfs.h
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.Ft int
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.Fn statvfs "const char *restrict path" "struct statvfs *restrict buf"
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.Ft int
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.Fn fstatvfs "int fd" "struct statvfs *buf"
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.Sh DESCRIPTION
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The
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.Fn statvfs
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and
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.Fn fstatvfs
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functions fill the structure pointed to by
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.Fa buf
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with garbage.
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This garbage will occasionally bear resemblance to filesystem
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statistics, but portable applications must not depend on this.
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Applications must pass a pathname or file descriptor which refers to a
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file on the filesystem in which they are interested.
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.Pp
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The
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.Vt statvfs
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structure contains the following members:
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.Bl -tag -offset indent -width "f_namemax"
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.It Va f_namemax
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The maximum length in bytes of a file name on this filesystem.
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Applications should use
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.Xr pathconf 3
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instead.
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.It Va f_fsid
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Not meaningful in this implementation.
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.It Va f_frsize
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The size in bytes of the minimum unit of allocation on this
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filesystem.
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(This corresponds to the
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.Va f_bsize
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member of
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.Vt "struct statfs" . )
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.It Va f_bsize
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The preferred length of I/O requests for files on this filesystem.
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(Corresponds to the
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.Va f_iosize
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member of
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.Vt "struct statfs" . )
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.It Va f_flag
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Flags describing mount options for this filesystem; see below.
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.El
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.Pp
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In addition, there are three members of type
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.Vt fsfilcnt_t ,
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which represent counts of file serial numbers
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.Pq Em i.e. , No inodes ;
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these are named
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.Va f_files ,
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.Va f_favail ,
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and
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.Va f_ffree ,
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and represent the number of file serial numbers which exist in total,
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are available to unprivileged processes, and are available to
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privileged processes, respectively.
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Likewise, the members
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.Va f_blocks ,
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.Va f_bavail ,
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and
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.Va f_bfree
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(all of type
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.Vt fsblkcnt_t )
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represent the respective allocation-block counts.
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.Pp
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There are two flags defined for the
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.Va f_flag
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member:
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.Bl -tag -offset indent -width "ST_NOSUID"
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.It Dv ST_RDONLY
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The filesystem is mounted read-only.
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.It Dv ST_NOSUID
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The semantics of the
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.Dv S_ISUID
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and
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.Dv S_ISGID
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file mode bits
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are not supported by, or are disabled on, this filesystem.
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.El
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.Sh IMPLEMENTATION NOTES
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The
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.Fn statvfs
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and
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.Fn fstatvfs
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functions are implemented as wrappers around the
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.Fn statfs
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and
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.Fn fstatfs
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functions, respectively.
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Not all the information provided by those functions is made available
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through this interface.
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.Sh RETURN VALUES
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.Rv -std statvfs fstatvfs
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.Sh ERRORS
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The
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.Fn statvfs
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and
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.Fn fstatvfs
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functions may fail for any of the reasons documented for
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.Xr statfs 2
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or
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.Xr fstatfs 2
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and
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.Xr pathconf 3
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or
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.Xr fpathconf 3 ,
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respectively.
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In addition,
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.Fn statvfs
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and
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.Fn fstatvfs
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functions may also fail for the following reason:
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.Bl -tag -width Er
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.It Bq Er EOVERFLOW
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One or more of the filesystem statistics has a value which cannot be
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represented by the data types used in
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.Vt "struct statvfs" .
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.El
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.Sh SEE ALSO
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.Xr statfs 2 ,
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.Xr pathconf 3
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.Sh STANDARDS
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The
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.Fn statvfs
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and
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.Fn fstatvfs
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functions conform to
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.St -p1003.1-2001 .
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As standardized, portable applications cannot depend on these functions
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returning any valid information at all.
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This implementation attempts to provide as much useful information as
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is provided by the underlying filesystem, subject to the limitations
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of the specified data types.
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.Sh HISTORY
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The
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.Nm
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function first appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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The
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.Nm
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function and this manual page were written by
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.An Garrett Wollman Aq wollman@FreeBSD.org .
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