| 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 | |