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.\" 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:
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.\" 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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.
.\"
.\" @(#)getfsstat.2 8.3 (Berkeley) 5/25/95
.\" $FreeBSD$
.\"
.Dd May 25, 1995
.Dt GETFSSTAT 2
.Os
.Sh NAME
.Nm getfsstat
.Nd get list of all mounted file systems
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/param.h
.In sys/ucred.h
.In sys/mount.h
.Ft int
.Fn getfsstat "struct statfs *buf" "long bufsize" "int flags"
.Sh DESCRIPTION
The
.Fn getfsstat
system call
returns information about all mounted file systems.
The
.Fa buf
argument
is a pointer to
.Xr statfs
structures defined as follows:
.Bd -literal
typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
/*
* file system statistics
*/
#define MFSNAMELEN 16 /* length of fs type name, including null */
#define MNAMELEN 90 /* length of buffer for returned name */
struct statfs {
long f_spare2; /* placeholder */
long f_bsize; /* fundamental file system block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
uid_t f_owner; /* user that mounted the file system */
int f_type; /* type of file system (see below) */
int f_flags; /* copy of mount flags */
long f_spare[2]; /* spare for later */
char f_fstypename[MFSNAMELEN];/* fs type name */
char f_mntonname[MNAMELEN];/* directory on which mounted */
char f_mntfromname[MNAMELEN];/* mounted file system */
};
.Ed
.Pp
The flags that may be returned include:
.Bl -tag -width MNT_ASYNCHRONOUS
.It Dv MNT_RDONLY
The file system is mounted read-only;
Even the super-user may not write on it.
.It Dv MNT_NOEXEC
Files may not be executed from the file system.
.It Dv MNT_NOSUID
Setuid and setgid bits on files are not honored when they are executed.
.It Dv MNT_NODEV
Special files in the file system may not be opened.
.It Dv MNT_SYNCHRONOUS
All I/O to the file system is done synchronously.
.It Dv MNT_ASYNCHRONOUS
No file system I/O is done synchronously.
.It Dv MNT_LOCAL
The file system resides locally.
.It Dv MNT_QUOTA
The file system has quotas enabled on it.
.It Dv MNT_ROOTFS
Identifies the root file system.
.It Dv MNT_EXRDONLY
The file system is exported read-only.
.It Dv MNT_EXPORTED
The file system is exported for both reading and writing.
.It Dv MNT_DEFEXPORTED
The file system is exported for both reading and writing to any Internet host.
.It Dv MNT_EXPORTANON
The file system maps all remote accesses to the anonymous user.
.It Dv MNT_EXKERB
The file system is exported with Kerberos uid mapping.
.El
.Pp
Fields that are undefined for a particular file system are set to -1.
The buffer is filled with an array of
.Fa fsstat
structures, one for each mounted file system
up to the size specified by
.Fa bufsize .
.Pp
If
.Fa buf
is given as NULL,
.Fn getfsstat
returns just the number of mounted file systems.
.Pp
Normally
.Fa flags
should be specified as
.Dv MNT_WAIT .
If
.Fa flags
is set to
.Dv MNT_NOWAIT ,
.Fn getfsstat
will return the information it has available without requesting
an update from each file system.
Thus, some of the information will be out of date, but
.Fn getfsstat
will not block waiting for information from a file system that is
unable to respond.
.Sh RETURN VALUES
Upon successful completion, the number of
.Fa fsstat
structures is returned.
Otherwise, -1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
The
.Fn getfsstat
system call
fails if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er EFAULT
The
.Fa buf
argument
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 ,
.Xr fstab 5 ,
.Xr mount 8
.Sh HISTORY
The
.Fn getfsstat
system call first appeared in
.Bx 4.4 .
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