NetBSD/lib/libc/sys/getfsstat.2

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.\" $NetBSD: getfsstat.2,v 1.5 1995/02/27 12:32:47 cgd Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" 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.
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.\" @(#)getfsstat.2 8.1 (Berkeley) 6/9/93
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.\"
.Dd June 9, 1993
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.Dt GETFSSTAT 2
.Os
.Sh NAME
.Nm getfsstat
.Nd get list of all mounted filesystems
.Sh SYNOPSIS
.Fd #include <sys/param.h>
.Fd #include <sys/ucred.h>
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.Fd #include <sys/mount.h>
.Ft int
.Fn getfsstat "struct statfs *buf" "long bufsize" "int flags"
.Sh DESCRIPTION
.Fn Getfsstat
returns information about all mounted filesystems.
.Fa Buf
is a pointer to
.Xr statfs
structures defined as follows:
.Bd -literal
typedef quad fsid_t;
#define MNAMELEN 32 /* length of buffer for returned name */
struct statfs {
short f_type; /* type of filesystem (see below) */
short f_flags; /* copy of mount flags */
long f_bsize; /* fundamental filesystem block size */
long f_iosize; /* optimal transfer block size */
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long f_blocks; /* total data blocks in filesystem */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in filesystem */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* filesystem id */
long f_spare[6]; /* spare for later */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
};
/*
* File system types.
*/
#define MOUNT_UFS 1
#define MOUNT_NFS 2
#define MOUNT_PC 3
.Ed
.Pp
Fields that are undefined for a particular filesystem are set to -1.
The buffer is filled with an array of
.Fa fsstat
structures, one for each mounted filesystem
up to the size specified by
.Fa bufsize .
.Pp
If
.Fa buf
is given as NULL,
.Fn getfsstat
returns just the number of mounted filesystems.
.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 filesystem.
Thus, some of the information will be out of date, but
.Fn getfsstat
will not block waiting for information from a filesystem 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
.Fn Getfsstat
fails if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er EFAULT
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.Fa Buf
points to an invalid address.
.It Bq Er EIO
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An
.Tn I/O
error occurred while reading from or writing to the filesystem.
.El
.Sh SEE ALSO
.Xr statfs 2 ,
.Xr fstab 5 ,
.Xr mount 8
.Sh HISTORY
The
.Fn getfsstat
function first appeared in 4.4BSD.