.\" Copyright (c) 2010 The DragonFly Project.  All rights reserved.
.\" 
.\" This code is derived from software contributed to The DragonFly Project
.\" by Akos Kovacs <akoskovacs@gmx.com>
.\" 
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.Dd December 12, 2010
.Dt LIBFSID 3
.Os
.Sh NAME
.Nm fsid_probe ,
.Nm fsid_probe_all ,
.Nm fsid_volname ,
.Nm fsid_volname_all ,
.Nm fsid_fsname ,
.Nm fsid_fs_count
.Nd general libfsid functions
.Sh LIBRARY
.Lb libfsid
.Sh SYNOPSIS
.In libfsid.h
.Ft fsid_t
.Fn fsid_probe "const char *dev" "const char *fs_name"
.Ft fsid_t
.Fn fsid_probe_all "const char *dev"
.Ft char *
.Fn fsid_volname "const char *dev" "const char *fs_name"
.Ft char *
.Fn fsid_volname_all "const char *dev"
.Ft const char *
.Fn fsid_fsname "fsid_t id"
.Ft int
.Fn fsid_fs_count "void"
.Sh DESCRIPTION
.\" General description
The
.Lb libfsid
provides an interface to determine several filesystems
and to get their volume labels.
.Pp
Most functions use the parameter
.Fa dev
for specifying the full path of the device and some of them have an additional
.Fa fs_name
parameter which is the name of the chosen filesystem.
It can be:
.Bl -tag -width ".Li MSDOSFS" -offset indent
.It Li HAMMER
A
.Xr HAMMER 5
filesystem
.It Li UFS
A
.Xr UFS 5
filesystem
.It Li CD9660
An ISO 9660 filesystem
.It Li EXT2
Linux' second extended filesystem
.It Li MSDOSFS
An
.Xr msdos 5
filesystem
.El
.Pp
.\" fsid_probe function
The
.Fn fsid_probe
function returns one of
.Dv FSID_CD9660 ,
.Dv FSID_EXT2 ,
.Dv FSID_HAMMER
or
.Dv FSID_UFS
if the device has the filesystem type as expected by the
.Fa fs_name
parameter, otherwise
.Dv FSID_UNKNOWN .
.Pp
.\" fsid_probe_all function
The
.Fn fsid_probe_all
function tries to identify the filesystem type.
It returns
.Dv FSID_UNKNOWN
if the filesystem is unknown, or the check fails.
Otherwise the returned value is one of:
.Bl -tag -width ".Dv FSID_MSDOSFS" -offset indent
.It Dv FSID_HAMMER
A
.Xr HAMMER 5
filesystem
.It Dv FSID_UFS
A
.Xr UFS 5
filesystem
.It Dv FSID_CD9660
An ISO 9660 filesystem
.It Dv FSID_EXT2
Linux' second extended filesystem
.It Dv FSID_MSDOSFS
An
.Xr msdos 5
filesystem
.El
.Pp
The name of the filesystem can be easily queried with the
.Fn fsid_fsname
function.
.Pp
The
.Fn fsid_volname
function returns the volume label, if the filesystem name is the same
as specified by
.Fa fs_name .
If not, it returns
.Dv NULL .
.Pp
The
.Fn fsid_volname_all
function returns the volume label, if the filesystem is known.
Otherwise it returns
.Dv NULL .
.Pp
The
.Fn fsid_fsname
function returns the name of the filesystem as a pointer to string.
The
.Fa id
is usually the return value of a
.Fn fsid_probe_all
call.
.Pp
The
.Fn fsid_fs_count
function returns the number of supported filesystems.
.Sh SEE ALSO
.Xr devattr 3
.Sh AUTHOR
.An -nosplit
The library and the manual page were written by
.An Akos Kovacs Aq Mt akoskovacs@gmx.com .