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	22	.Dd January 14, 2003
	23	.Dt FSCTL 2
	24	.Os "Mac OS X"
	25	.Sh NAME
	26	.Nm fsctl
	27	.Nd control filesystems
	28	.Sh SYNOPSIS
	29	.Fd #include <sys/attr.h>
	30	.Fd #include <sys/ioctl.h>
	31	.Ft int
	32	.Fn fsctl "const char path" "unsigned long request" "void data" "unsigned long options"
	33	.Sh DESCRIPTION
	34	The
	35	.Fn fsctl
	36	function manipulates the filesystem controlling mounted volumes.
	37	In particular, many filesystem-specific operating
	38	characteristics of mounted filesystems may be controlled
	39	with
	40	.Fn fsctl
	41	requests.
	42	.Fn fsctl
	43	requests can also be used to extract filesystem-specific
	44	information for a mounted volumes.
	45	.Pp
	46	.Fa path
	47	is the path name of any file within the mounted filesystem.
	48	An fsctl
	49	.Fa request
	50	has encoded in it whether the argument is an
	51	.Dq in
	52	parameter
	53	or
	54	.Dq out
	55	parameter, and the size of the argument
	56	.Fa data
	57	in bytes.
	58	Values for
	59	.Fa request
	60	are entirely filesystem-specific except for the following, defined in
	61	.Ao Pa sys/fsctl.h Ac :
	62	.Bd -literal -offset indent
	63	FSGETMOUNTINFOSIZE /* Return size of mount info data */
	64	.Ed
	65	.Pp
	66	Macros and defines used in specifying an fsctl
	67	.Fa request
	68	are the same as for
	69	.Fn ioctl
	70	requests and are located in the file
	71	.Ao Pa sys/ioccom.h Ac .
	72	.Fa options
	73	may specify special flags for the processing of the
	74	.Fn fsctl
	75	call. The options are specified by
	76	.Em or Ns 'ing
	77	the option values. The only option currently defined is
	78	.Bd -literal -offset indent
	79	#define FSOPT_NOFOLLOW 0x00000001 /* Don't follow symlinks */
	80	.Ed
	81	.Pp
	82	which is interpreted by the
	83	.Fn fsctl
	84	call to prevent following of symlinks. The
85	.Fa options
86	argument is passed to the filesystem, which may define and handle
87	additional
88	.Fa options
89	bit values.
90	.Sh RETURN VALUES
91	.Pp
92	If an error has occurred, a value of -1 is returned and
93	.Va errno
94	is set to indicate the error.
95	.Sh ERRORS
96	.Fn fsctl
97	will fail if:
98	.Bl -tag -width Er
99	.It Bq Er ENOTDIR
100	A component of the path prefix is not a directory.
101	.It Bq Er ENAMETOOLONG
102	A component of a pathname exceeded
103	.Dv {NAME_MAX}
104	characters, or an entire path name exceeded
105	.Dv {PATH_MAX}
106	characters.
107	.It Bq Er ENOENT
108	The named file does not exist.
109	.It Bq Er EACCES
110	Search permission is denied for a component of the path prefix.
111	.It Bq Er ELOOP
112	Too many symbolic links were encountered in translating the pathname.
113	.It Bq Er EFAULT
114	.Fa path
115	or
116	.Em data
117	points to an invalid address.
118	.It Bq Er EIO
119	An
120	.Tn I/O
121	error occurred while reading from or writing to the file system.
122	.It Bq Er EINVAL
123	.Fa request
124	or
125	.Fa data
126	is not valid.
127	.El
128	.Sh SEE ALSO
55e303ae	129	.Xr getattrlist 2 ,
2d21ac55	130	.Xr ioctl 2 ,
55e303ae A	131	.Xr setattrlist 2
	132	.Sh HISTORY
	133	The
	134	.Fn fsctl
	135	function call appeared in Mac OS X version 10.0.