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01: /* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski
02: 
03:    This program is free software; you can redistribute it and/or
04:    modify it under the terms of the GNU Lesser General Public
05:    License as published by the Free Software Foundation; either
06:    version 2.1 of the License, or (at your option) any later version.
07: 
08:    It is distributed in the hope that it will be useful,
09:    but WITHOUT ANY WARRANTY; without even the implied warranty of
10:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11:    Lesser General Public License for more details.
12: 
13:    You should have received a copy of the GNU Lesser General Public
14:    License along with this software; if not, write to the Free
15:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
16:    02111-1307 USA.  */
17: 
18: #ifndef _LINUX_MQUEUE_H
19: #define _LINUX_MQUEUE_H
20: 
21: #define MQ_PRIO_MAX     32768
22: /* per-uid limit of kernel memory used by mqueue, in bytes */
23: #define MQ_BYTES_MAX    819200
24: 
25: struct mq_attr {
26:         long    mq_flags;       /* message queue flags                  */
27:         long    mq_maxmsg;      /* maximum number of messages           */
28:         long    mq_msgsize;     /* maximum message size                 */
29:         long    mq_curmsgs;     /* number of messages currently queued  */
30:         long    __reserved[4];  /* ignored for input, zeroed for output */
31: };
32: 
33: /*
34:  * SIGEV_THREAD implementation:
35:  * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed
36:  * to mq_notify, then
37:  * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not
38:  *   necessary that the socket is bound.
39:  * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN
40:  *   bytes long.
41:  * If the notification is triggered, then the cookie is sent to the netlink
42:  * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes:
43:  * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was
44:  * removed, either due to a close() on the message queue fd or due to a
45:  * mq_notify() that removed the notification.
46:  */
47: #define NOTIFY_NONE     0
48: #define NOTIFY_WOKENUP  1
49: #define NOTIFY_REMOVED  2
50: 
51: #define NOTIFY_COOKIE_LEN       32
52: 
53: #endif
54: 

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