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-.TH FMOUNT 2
-.CT 2 sa
-.SH NAME
-fmount, funmount \- mount or remove file system
-.SH SYNOPSIS
-.nf
-.B int fmount(type, fildes, name, flag)
-.B char *name;
-.PP
-.B int funmount(name)
-.B char *name;
-.PP
-.B #include <sys/label.h>
-.PP
-.B int fmount5(type, fildes, name, flag, ceiling)
-.B char *name;
-.B struct label *ceiling;
-.fi
-.SH DESCRIPTION
-.I Fmount
-mounts a file system of the named
-.I type
-described by the file descriptor
-.I fildes
-on pathname
-.IR name .
-The ceiling label, described under
-.I fmount5,
-is given a default value.
-Henceforth,
-references to
-.I name
-(the mount point)
-will refer to the root file
-on the newly mounted file system.
-.PP
-.I Name
-must already exist.
-Its old contents are inaccessible while the
-file system is mounted.
-.PP
-The meaning of
-.I flag
-varies with the file system type.
-.PP
-Allowed types are
-.TP
-.B 0
-Regular (block device) file system.
-.I Fildes
-should be a block special file.
-If
-.I flag
-is nonzero,
-the file system may not be written on;
-this must be used with physically write-protected media
-or errors will occur when access times are updated,
-even if no explicit write is attempted.
-The default ceiling label is lattice top with all privileges.
-.TP
-.B 1
-Obsolete version of the
-network file system.
-.TP
-.B 2
-Process file system,
-.IR proc (4).
-.I Fildes
-is ignored.
-.TP
-.B 3
-Mounted stream.
-.I Fildes
-must refer to a stream;
-future calls to
-.IR open (2)
-on
-.I name
-will reopen the stream.
-The mount is undone
-if the other end of the stream
-is closed or hung up.
-.TP
-.B 4
-Stream (network) file system.
-.I Fildes
-is a stream,
-whose other end is handled by a file system server,
-.IR netfs (8).
-The default ceiling label is lattice bottom with no privileges.
-.PP
-Types 5 and 6
-are used internally
-to close off errors
-and for pipes;
-these types may not be mounted.
-.PP
-.I Fmount5
-performs the function of
-.I fmount
-and, on file systems of type 0 or 4, imposes a specified 
-.I ceiling
-label.
-No file in the file system can be accessed \-
-regardless of privilege \- unless the label of the file
-is dominated by the file system ceiling.
-Moreover, in determining capabilities during
-.IR exec (2),
-capability and license bits in the file label are
-masked by corresponding bits in the ceiling.
-.PP
-Ceilings may be used to limit the labels of data
-placed in file systems for export to untrusted destinations,
-and to limit the acquisition
-of privilege by programs in file systems of untrusted origin.
-.PP
-.I Funmount
-removes knowledge of the file system
-on which
-.I name
-resides.
-The mount point
-reverts to its previous interpretation.
-.PP
-Anyone may mount or unmount
-process file systems
-(type 3);
-for other types,
-these calls are restricted to the
-super-user.
-All require capability
-.BR T_EXTERN ;
-see 
-.IR getplab (2).
-.SH SEE ALSO
-.IR labmount (2),
-.IR mount (8)
-.SH DIAGNOSTICS
-.BR EBADF ,
-.BR EBUSY ,
-.BR EINVAL ,
-.BR EIO ,
-.BR ELAB ,
-.BR ENODEV
-.SH BUGS
-Although
-.I fildes
-for type 2 file systems is ignored,
-it must be a valid file descriptor.