1 | /* $NetBSD: mqueue.h,v 1.17 2015/06/20 14:41:54 martin Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2007-2009 Mindaugas Rasiukevicius <rmind at NetBSD org> |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | |
29 | #ifndef _SYS_MQUEUE_H_ |
30 | #define _SYS_MQUEUE_H_ |
31 | |
32 | /* Maximal number of mqueue descriptors, that process could open */ |
33 | #define MQ_OPEN_MAX 512 |
34 | |
35 | /* Maximal priority of the message */ |
36 | #define MQ_PRIO_MAX 32 |
37 | |
38 | struct mq_attr { |
39 | long mq_flags; /* Flags of message queue */ |
40 | long mq_maxmsg; /* Maximum number of messages */ |
41 | long mq_msgsize; /* Maximum size of the message */ |
42 | long mq_curmsgs; /* Count of the queued messages */ |
43 | }; |
44 | |
45 | /* Internal kernel data */ |
46 | #ifdef _KERNEL |
47 | |
48 | #include <sys/condvar.h> |
49 | #include <sys/mutex.h> |
50 | #include <sys/queue.h> |
51 | #include <sys/selinfo.h> |
52 | #include <sys/types.h> |
53 | #include <sys/param.h> |
54 | |
55 | /* |
56 | * Flags below are used in mq_flags for internal purposes. |
57 | * This is permitted according to POSIX. |
58 | */ |
59 | |
60 | /* Message queue is unlinked */ |
61 | #define MQ_UNLINKED 0x10000000 |
62 | /* There are receive-waiters */ |
63 | #define MQ_RECEIVE 0x20000000 |
64 | |
65 | /* Maximal length of mqueue name */ |
66 | #define MQ_NAMELEN (KERNEL_NAME_MAX + 1) |
67 | |
68 | /* Default size of the message */ |
69 | #define MQ_DEF_MSGSIZE 1024 |
70 | |
71 | /* Size/bits and index of reserved queue */ |
72 | #define MQ_PQSIZE 32 |
73 | #define MQ_PQRESQ 0 |
74 | |
75 | /* Structure of the message queue. */ |
76 | typedef struct mqueue { |
77 | char * mq_name; |
78 | kmutex_t mq_mtx; |
79 | kcondvar_t mq_send_cv; |
80 | kcondvar_t mq_recv_cv; |
81 | struct mq_attr mq_attrib; |
82 | /* Notification */ |
83 | struct selinfo mq_rsel; |
84 | struct selinfo mq_wsel; |
85 | struct sigevent mq_sig_notify; |
86 | struct proc * mq_notify_proc; |
87 | /* Permissions */ |
88 | mode_t mq_mode; |
89 | uid_t mq_euid; |
90 | gid_t mq_egid; |
91 | /* Reference counter, queue array and bitmap */ |
92 | u_int mq_refcnt; |
93 | TAILQ_HEAD(, mq_msg) mq_head[1 + MQ_PQSIZE]; |
94 | uint32_t mq_bitmap; |
95 | /* Entry of the global list */ |
96 | LIST_ENTRY(mqueue) mq_list; |
97 | /* Time stamps */ |
98 | struct timespec mq_atime; |
99 | struct timespec mq_mtime; |
100 | struct timespec mq_btime; |
101 | } mqueue_t; |
102 | |
103 | /* Structure of the message. */ |
104 | typedef struct mq_msg { |
105 | TAILQ_ENTRY(mq_msg) msg_queue; |
106 | size_t msg_len; |
107 | u_int msg_prio; |
108 | uint8_t msg_ptr[1]; |
109 | } mq_msg_t; |
110 | |
111 | /* Prototypes */ |
112 | void mqueue_print_list(void (*pr)(const char *, ...) __printflike(1, 2)); |
113 | int mq_send1(mqd_t, const char *, size_t, u_int, struct timespec *); |
114 | int mq_recv1(mqd_t, void *, size_t, u_int *, struct timespec *, ssize_t *); |
115 | int mqueue_get(mqd_t mqd, int fflag, mqueue_t **mqret); |
116 | int mq_handle_open(struct lwp *l, const char *, int, mode_t, |
117 | struct mq_attr*, register_t *retval); |
118 | |
119 | #endif /* _KERNEL */ |
120 | |
121 | #endif /* _SYS_MQUEUE_H_ */ |
122 | |