1*607ca46eSDavid Howells /* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski 2*607ca46eSDavid Howells 3*607ca46eSDavid Howells This program is free software; you can redistribute it and/or 4*607ca46eSDavid Howells modify it under the terms of the GNU Lesser General Public 5*607ca46eSDavid Howells License as published by the Free Software Foundation; either 6*607ca46eSDavid Howells version 2.1 of the License, or (at your option) any later version. 7*607ca46eSDavid Howells 8*607ca46eSDavid Howells It is distributed in the hope that it will be useful, 9*607ca46eSDavid Howells but WITHOUT ANY WARRANTY; without even the implied warranty of 10*607ca46eSDavid Howells MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11*607ca46eSDavid Howells Lesser General Public License for more details. 12*607ca46eSDavid Howells 13*607ca46eSDavid Howells You should have received a copy of the GNU Lesser General Public 14*607ca46eSDavid Howells License along with this software; if not, write to the Free 15*607ca46eSDavid Howells Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 16*607ca46eSDavid Howells 02111-1307 USA. */ 17*607ca46eSDavid Howells 18*607ca46eSDavid Howells #ifndef _LINUX_MQUEUE_H 19*607ca46eSDavid Howells #define _LINUX_MQUEUE_H 20*607ca46eSDavid Howells 21*607ca46eSDavid Howells #define MQ_PRIO_MAX 32768 22*607ca46eSDavid Howells /* per-uid limit of kernel memory used by mqueue, in bytes */ 23*607ca46eSDavid Howells #define MQ_BYTES_MAX 819200 24*607ca46eSDavid Howells 25*607ca46eSDavid Howells struct mq_attr { 26*607ca46eSDavid Howells long mq_flags; /* message queue flags */ 27*607ca46eSDavid Howells long mq_maxmsg; /* maximum number of messages */ 28*607ca46eSDavid Howells long mq_msgsize; /* maximum message size */ 29*607ca46eSDavid Howells long mq_curmsgs; /* number of messages currently queued */ 30*607ca46eSDavid Howells long __reserved[4]; /* ignored for input, zeroed for output */ 31*607ca46eSDavid Howells }; 32*607ca46eSDavid Howells 33*607ca46eSDavid Howells /* 34*607ca46eSDavid Howells * SIGEV_THREAD implementation: 35*607ca46eSDavid Howells * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed 36*607ca46eSDavid Howells * to mq_notify, then 37*607ca46eSDavid Howells * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not 38*607ca46eSDavid Howells * necessary that the socket is bound. 39*607ca46eSDavid Howells * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN 40*607ca46eSDavid Howells * bytes long. 41*607ca46eSDavid Howells * If the notification is triggered, then the cookie is sent to the netlink 42*607ca46eSDavid Howells * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes: 43*607ca46eSDavid Howells * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was 44*607ca46eSDavid Howells * removed, either due to a close() on the message queue fd or due to a 45*607ca46eSDavid Howells * mq_notify() that removed the notification. 46*607ca46eSDavid Howells */ 47*607ca46eSDavid Howells #define NOTIFY_NONE 0 48*607ca46eSDavid Howells #define NOTIFY_WOKENUP 1 49*607ca46eSDavid Howells #define NOTIFY_REMOVED 2 50*607ca46eSDavid Howells 51*607ca46eSDavid Howells #define NOTIFY_COOKIE_LEN 32 52*607ca46eSDavid Howells 53*607ca46eSDavid Howells #endif 54