NetBSD/lib/libc/sys/getfsstat.2

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.\" $NetBSD: getfsstat.2,v 1.6 1995/06/29 11:40:44 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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.\" This product includes software developed by the University of
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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 file systems
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.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 file systems.
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.Fa Buf
is a pointer to
.Xr statfs
structures defined as follows:
.Bd -literal
typedef struct { int32_t val[2]; } fsid_t;
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#define MFSNAMELEN 16 /* length of fs type name, including nul */
#define MNAMELEN 32 /* length of buffer for returned name */
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struct statfs {
short f_type; /* type of file system (unused; zero) */
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short f_flags; /* copy of mount flags */
long f_bsize; /* fundamental file system block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
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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 */
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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 */
long f_spare[4]; /* 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 */
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};
.Ed
.Pp
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
.Fa statfs
structures, one for each mounted file system
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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.
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.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.
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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
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unable to respond.
.Sh RETURN VALUES
Upon successful completion, the number of
.Fa statfs
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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 file system.
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.El
.Sh SEE ALSO
.Xr statfs 2 ,
.Xr fstab 5 ,
.Xr mount 8
.Sh HISTORY
The
.Fn getfsstat
function first appeared in 4.4BSD.