135 lines
4.6 KiB
Groff
135 lines
4.6 KiB
Groff
.\" $NetBSD: getfsstat.2,v 1.6 1995/06/29 11:40:44 cgd Exp $
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.\"
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.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT 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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.\" @(#)getfsstat.2 8.1 (Berkeley) 6/9/93
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.\"
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.Dd June 9, 1993
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.Dt GETFSSTAT 2
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.Os
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.Sh NAME
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.Nm getfsstat
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.Nd get list of all mounted file systems
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <sys/ucred.h>
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.Fd #include <sys/mount.h>
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.Ft int
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.Fn getfsstat "struct statfs *buf" "long bufsize" "int flags"
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.Sh DESCRIPTION
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.Fn Getfsstat
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returns information about all mounted file systems.
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.Fa Buf
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is a pointer to
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.Xr statfs
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structures defined as follows:
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.Bd -literal
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typedef struct { int32_t val[2]; } fsid_t;
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#define MFSNAMELEN 16 /* length of fs type name, including nul */
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#define MNAMELEN 32 /* length of buffer for returned name */
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struct statfs {
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short f_type; /* type of file system (unused; zero) */
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short f_flags; /* copy of mount flags */
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long f_bsize; /* fundamental file system block size */
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long f_iosize; /* optimal transfer block size */
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long f_blocks; /* total data blocks in file system */
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long f_bfree; /* free blocks in fs */
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long f_bavail; /* free blocks avail to non-superuser */
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long f_files; /* total file nodes in file system */
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long f_ffree; /* free file nodes in fs */
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fsid_t f_fsid; /* file system id */
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uid_t f_owner; /* user that mounted the file system */
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long f_spare[4]; /* spare for later */
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char f_fstypename[MFSNAMELEN]; /* fs type name */
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char f_mntonname[MNAMELEN]; /* directory on which mounted */
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char f_mntfromname[MNAMELEN]; /* mounted file system */
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};
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.Ed
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.Pp
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Fields that are undefined for a particular file system are set to -1.
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The buffer is filled with an array of
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.Fa statfs
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structures, one for each mounted file system
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up to the size specified by
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.Fa bufsize .
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.Pp
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If
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.Fa buf
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is given as NULL,
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.Fn getfsstat
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returns just the number of mounted file systems.
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.Pp
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Normally
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.Fa flags
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should be specified as
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.Dv MNT_WAIT .
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If
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.Fa flags
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is set to
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.Dv MNT_NOWAIT ,
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.Fn getfsstat
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will return the information it has available without requesting
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an update from each file system.
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Thus, some of the information will be out of date, but
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.Fn getfsstat
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will not block waiting for information from a file system that is
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unable to respond.
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.Sh RETURN VALUES
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Upon successful completion, the number of
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.Fa statfs
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structures is returned.
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Otherwise, -1 is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn Getfsstat
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fails if one or more of the following are true:
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.Bl -tag -width Er
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.It Bq Er EFAULT
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.Fa Buf
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points to an invalid address.
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.It Bq Er EIO
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An
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.Tn I/O
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error occurred while reading from or writing to the file system.
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.El
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.Sh SEE ALSO
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.Xr statfs 2 ,
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.Xr fstab 5 ,
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.Xr mount 8
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.Sh HISTORY
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The
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.Fn getfsstat
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function first appeared in 4.4BSD.
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