1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 *
22 *	Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
23 *	Use is subject to license terms.
24 */
25
26#ifndef	_SYS_PATHCONF_H
27#define	_SYS_PATHCONF_H
28
29#pragma ident	"%Z%%M%	%I%	%E% SMI"
30
31/*	pathconf.h 1.9 89/06/26 SMI	*/
32
33#include <sys/unistd.h>
34#include <sys/types.h>
35
36#ifdef	__cplusplus
37extern "C" {
38#endif
39
40/*
41 * POSIX pathconf information
42 *
43 * static pathconf kludge notes:
44 *	For NFSv2 servers, we've added a vop (vop_cntl) to dig out pathconf
45 *	information.  The mount program asked for the information from
46 *	a remote mountd daemon.  If it gets it, it passes the info
47 *	down in a new args field.  The info is passed in the struct below
48 *	in nfsargs.pathconf.  There's a new NFS mount flag so that you know
49 *	this is happening.  NFS stores the information locally; when a
50 *	pathconf request is made, the request is intercepted at the client
51 *	and the information is retrieved from the struct passed down by
52 *	mount. It's a kludge that will go away as soon
53 *	as we can ask the nfs protocol these sorts of questions (NFSr3).
54 *	All code is noted by "static pathconf kludge" comments and is
55 *	restricted to nfs code in the kernel.
56 */
57
58#define	_BITS		(8 * sizeof (short))
59#define	_PC_N		((_PC_LAST + _BITS - 1) / _BITS)
60#define	_PC_ISSET(n, a)	(a[(n) / _BITS] & (1 << ((n) % _BITS)))
61#define	_PC_SET(n, a)	(a[(n) / _BITS] |= (1 << ((n) % _BITS)))
62#define	_PC_ERROR	0
63
64struct	pathcnf {
65	/*
66	 * pathconf() information
67	 */
68	int		pc_link_max;	/* max links allowed */
69	short		pc_max_canon;	/* max line len for a tty */
70	short		pc_max_input;	/* input a tty can eat all once */
71	short		pc_name_max;	/* max file name length (dir entry) */
72	short		pc_path_max;	/* path name len (/x/y/z/...) */
73	short		pc_pipe_buf;	/* size of a pipe (bytes) */
74	uchar_t		pc_vdisable;	/* safe char to turn off c_cc[i] */
75	char		pc_xxx;		/* alignment padding; cc_t == char */
76	short		pc_mask[_PC_N];	/* see below */
77#ifdef	_KERNEL
78	short		pc_refcnt;	/* number of mounts that use this */
79	struct pathcnf	*pc_next;	/* linked list */
80#endif
81};
82
83#ifdef _SYSCALL32
84struct	pathcnf32 {
85	/*
86	 * pathconf() information
87	 */
88	int32_t		pc_link_max;	/* max links allowed */
89	int16_t		pc_max_canon;	/* max line len for a tty */
90	int16_t		pc_max_input;	/* input a tty can eat all once */
91	int16_t		pc_name_max;	/* max file name length (dir entry) */
92	int16_t		pc_path_max;	/* path name len (/x/y/z/...) */
93	int16_t		pc_pipe_buf;	/* size of a pipe (bytes) */
94	uint8_t		pc_vdisable;	/* safe char to turn off c_cc[i] */
95	int8_t		pc_xxx;		/* alignment padding; cc_t == char */
96	int16_t		pc_mask[_PC_N];	/* see below */
97#ifdef	_KERNEL
98	int16_t		pc_refcnt;	/* number of mounts that use this */
99	caddr32_t	pc_next;	/* linked list */
100#endif
101};
102#endif /* _SYSCALL32 */
103
104/*
105 * pc_mask is used to encode either
106 *	a) boolean values (for chown_restricted and no_trunc)
107 *	b) errno on/off (for link, canon, input, name, path, and pipe)
108 * The _PC_XXX values are defined in unistd.h; they start at 1 and go up
109 * sequentially.
110 * _PC_ERROR is used as the first bit to indicate total failure
111 * (all info invalid).
112 * To check for an error something like
113 * 	_PC_ISSET(_PC_PATHMAX, foo.pc_mask) != 0
114 * is used.
115 */
116
117/*
118 * The size of the non-kernel part of the struct.
119 */
120#ifdef	_KERNEL
121#define	PCSIZ		(int)(&(((struct pathcnf *)0)->pc_refcnt))
122#define	PCCMP(p1, p2)	bcmp((char *)p1, (char *)p2, PCSIZ)
123#endif
124
125#ifdef	__cplusplus
126}
127#endif
128
129#endif	/* _SYS_PATHCONF_H */
130