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	1	.\" $NetBSD: chflags.2,v 1.6 1995/02/27 12:32:03 cgd Exp $
	2	.\"
	3	.\" Copyright (c) 1989, 1993
	4	.\" The Regents of the University of California. All rights reserved.
	5	.\"
	6	.\" Redistribution and use in source and binary forms, with or without
	7	.\" modification, are permitted provided that the following conditions
	8	.\" are met:
	9	.\" 1. Redistributions of source code must retain the above copyright
	10	.\" notice, this list of conditions and the following disclaimer.
	11	.\" 2. Redistributions in binary form must reproduce the above copyright
	12	.\" notice, this list of conditions and the following disclaimer in the
	13	.\" documentation and/or other materials provided with the distribution.
	14	.\" 3. All advertising materials mentioning features or use of this software
	15	.\" must display the following acknowledgement:
	16	.\" This product includes software developed by the University of
	17	.\" California, Berkeley and its contributors.
	18	.\" 4. Neither the name of the University nor the names of its contributors
	19	.\" may be used to endorse or promote products derived from this software
	20	.\" without specific prior written permission.
	21	.\"
	22	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	.\" SUCH DAMAGE.
	33	.\"
	34	.\" @(#)chflags.2 8.1 (Berkeley) 6/9/93
	35	.\"
	36	.Dd June 9, 1993
	37	.Dt CHFLAGS 2
	38	.Os
	39	.Sh NAME
	40	.Nm chflags ,
	41	.Nm fchflags
	42	.Nd set file flags
	43	.Sh SYNOPSIS
	44	.Fd #include <sys/stat.h>
	45	.Fd #include <unistd.h>
	46	.Ft int
	47	.Fn chflags "const char *path" "u_long flags"
	48	.Ft int
	49	.Fn fchflags "int fd" "u_long flags"
	50	.Sh DESCRIPTION
	51	The file whose name
	52	is given by
	53	.Fa path
	54	or referenced by the descriptor
	55	.Fa fd
	56	has its flags changed to
	57	.Fa flags .
	58	.Pp
	59	The flags specified are formed by
	60	.Em or Ns 'ing
	61	the following values
	62	.Pp
	63	.Bl -tag -width "SF_IMMUTABLE" -compact -offset indent
	64	.It UF_NODUMP
	65	Do not dump the file.
	66	.It UF_IMMUTABLE
	67	The file may not be changed.
	68	.It UF_APPEND
	69	The file may only be appended to.
	70	.\".It ARCHIVED
	71	.\"File is archived.
	72	.It SF_IMMUTABLE
	73	The file may not be changed.
	74	.It SF_APPEND
	75	The file may only be appended to.
	76	.El
	77	.Pp
	78	The
	79	.Dq UF_IMMUTABLE
	80	and
	81	.Dq UF_APPEND
	82	flags may be set or unset by either the owner of a file or the super-user.
	83	.Pp
	84	The
	85	.Dq SF_IMMUTABLE
	86	and
	87	.Dq SF_APPEND
	88	flags may only be set or unset by the super-user.
	89	They may be set at any time, but normally may only be unset when
	90	the system is in single-user mode.
	91	(See
	92	.Xr init 8
	93	for details.)
	94	.Sh RETURN VALUES
	95	Upon successful completion, a value of 0 is returned.
	96	Otherwise, -1 is returned and the global variable
	97	.Va errno
	98	is set to indicate the error.
	99	.Sh ERRORS
	100	.Fn Chflags
	101	will fail it:
	102	.Bl -tag -width Er
	103	.It Bq Er ENOTDIR
	104	A component of the path prefix is not a directory.
	105	.It Bq Er ENAMETOOLONG
	106	A component of a pathname exceeded
	107	.Dv {NAME_MAX}
	108	characters, or an entire path name exceeded
	109	.Dv {PATH_MAX}
	110	characters.
	111	.It Bq Er ENOENT
	112	The named file does not exist.
	113	.It Bq Er EACCES
	114	Search permission is denied for a component of the path prefix.
	115	.It Bq Er ELOOP
	116	Too many symbolic links were encountered in translating the pathname.
	117	.It Bq Er EPERM
	118	The effective user ID does not match the owner of the file and
	119	the effective user ID is not the super-user.
	120	.It Bq Er EROFS
	121	The named file resides on a read-only file system.
	122	.It Bq Er EFAULT
	123	.Fa Path
	124	points outside the process's allocated address space.
	125	.It Bq Er EIO
	126	An
	127	.Tn I/O
	128	error occurred while reading from or writing to the file system.
	129	.El
	130	.Pp
	131	.Fn Fchflags
	132	will fail if:
	133	.Bl -tag -width Er
	134	.It Bq Er EBADF
	135	The descriptor is not valid.
	136	.It Bq Er EINVAL
	137	.Fa fd
	138	refers to a socket, not to a file.
	139	.It Bq Er EPERM
	140	The effective user ID does not match the owner of the file and
	141	the effective user ID is not the super-user.
	142	.It Bq Er EROFS
	143	The file resides on a read-only file system.
	144	.It Bq Er EIO
	145	An
	146	.Tn I/O
	147	error occurred while reading from or writing to the file system.
	148	.El
	149	.Sh SEE ALSO
	150	.Xr chflags 1 ,
	151	.Xr init 8
	152	.Sh HISTORY
	153	The
	154	.Fn chflags
	155	and
	156	.Nm fchflags
	157	functions first appeared in 4.4BSD.