xref: /illumos-gate/usr/src/uts/common/sys/devpoll.h (revision f3bb54f3)
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 /*
23  * Copyright (c) 1998 by Sun Microsystems, Inc.
24  * All rights reserved.
25  */
26 
27 /*
28  * Copyright 2015, Joyent, Inc.
29  */
30 
31 #ifndef	_SYS_DEVPOLL_H
32 #define	_SYS_DEVPOLL_H
33 
34 #include <sys/poll_impl.h>
35 #include <sys/types32.h>
36 
37 #ifdef	__cplusplus
38 extern "C" {
39 #endif
40 
41 
42 /* /dev/poll ioctl */
43 #define		DPIOC	(0xD0 << 8)
44 #define	DP_POLL		(DPIOC | 1)	/* poll on fds cached via /dev/poll */
45 #define	DP_ISPOLLED	(DPIOC | 2)	/* is this fd cached in /dev/poll */
46 #define	DP_PPOLL	(DPIOC | 3)	/* ppoll on fds cached via /dev/poll */
47 #define	DP_EPOLLCOMPAT	(DPIOC | 4)	/* turn on epoll compatibility */
48 
49 #define	DEVPOLLSIZE	1000		/* /dev/poll table size increment */
50 
51 /*
52  * /dev/poll DP_POLL ioctl format
53  */
54 typedef struct dvpoll {
55 	pollfd_t	*dp_fds;	/* pollfd array */
56 	nfds_t		dp_nfds;	/* num of pollfd's in dp_fds[] */
57 	int		dp_timeout;	/* time out in milisec */
58 	sigset_t	*dp_setp;	/* sigset, if any */
59 } dvpoll_t;
60 
61 typedef struct dvpoll32 {
62 	caddr32_t	dp_fds;		/* pollfd array */
63 	uint32_t	dp_nfds;	/* num of pollfd's in dp_fds[] */
64 	int32_t		dp_timeout;	/* time out in milisec */
65 	caddr32_t	dp_setp;	/* sigset, if any */
66 } dvpoll32_t;
67 
68 typedef struct dvpoll_epollfd {
69 	pollfd_t	dpep_pollfd;	/* must be first member */
70 	uint64_t	dpep_data;	/* data payload */
71 } dvpoll_epollfd_t;
72 
73 #ifdef _KERNEL
74 
75 typedef struct dp_entry {
76 	kmutex_t	dpe_lock;	/* protect a devpoll entry */
77 	pollcache_t	*dpe_pcache;	/* a ptr to pollcache */
78 	int		dpe_refcnt;	/* no. of ioctl lwp on the dpe */
79 	int		dpe_writerwait;	/* no. of waits on write */
80 	int		dpe_flag;	/* see below */
81 	kcondvar_t	dpe_cv;
82 } dp_entry_t;
83 
84 #define	DP_WRITER_PRESENT	0x1	/* a write is in progress */
85 #define	DP_ISEPOLLCOMPAT	0x2	/* epoll compatibility mode */
86 
87 #define	DP_REFRELE(dpep) {			\
88 	mutex_enter(&(dpep)->dpe_lock);		\
89 	ASSERT((dpep)->dpe_refcnt > 0);		\
90 	(dpep)->dpe_refcnt--;			\
91 	mutex_exit(&(dpep)->dpe_lock);		\
92 }
93 #endif	/* _KERNEL */
94 
95 #ifdef	__cplusplus
96 }
97 #endif
98 
99 #endif	/* _SYS_DEVPOLL_H */
100