1.\" 2.\" Copyright (c) 1994 SigmaSoft, Th. Lockert 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by SigmaSoft, Th. Lockert. 16.\" 3. The name of the author may not be used to endorse or promote products 17.\" derived from this software without specific prior written permission 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd March 24, 2004 31.Dt "IPCS" 1 32.Os 33.Sh NAME 34.Nm ipcs 35.Nd report System V interprocess communication facilities status 36.Sh SYNOPSIS 37.Nm 38.Op Fl abcmopqstMQSTy 39.Op Fl C Ar core 40.Op Fl N Ar system 41.Op Fl u Ar user 42.Sh DESCRIPTION 43The 44.Nm 45utility provides information on System V interprocess communication 46(IPC) facilities on the system. 47.Pp 48The options are as follows: 49.Bl -tag -width Ds 50.It Fl a 51Show the maximum amount of information possible when 52displaying active semaphores, message queues, 53and shared memory segments. 54(This is shorthand for specifying the 55.Fl b , 56.Fl c , 57.Fl o , 58.Fl p , 59and 60.Fl t 61options.) 62.It Fl b 63Show the maximum allowed sizes for active semaphores, message queues, 64and shared memory segments. 65The 66.Dq maximum allowed size 67is the maximum number of bytes in a message on a message queue, 68the size of a shared memory segment, 69or the number of semaphores in a set of semaphores. 70.It Fl c 71Show the creator's name and group for active semaphores, message queues, 72and shared memory segments. 73.It Fl m 74Display information about active shared memory segments. 75.It Fl o 76Show outstanding usage for active message queues, 77and shared memory segments. 78The 79.Dq outstanding usage 80is the number of messages in a message queue, or the number 81of processes attached to a shared memory segment. 82.It Fl p 83Show the process ID information for active semaphores, message queues, 84and shared memory segments. 85The 86.Dq process ID information 87is the last process to send a message to or receive a message from 88a message queue, 89the process that created a semaphore, or the last process to attach 90or detach a shared memory segment. 91.It Fl q 92Display information about active message queues. 93.It Fl s 94Display information about active semaphores. 95.It Fl t 96Show access times for active semaphores, message queues, 97and shared memory segments. 98The access times is the time 99of the last control operation on an IPC object, 100the last send or receive of a message, 101the last attach or detach of a shared memory segment, 102or the last operation on a semaphore. 103.It Fl C Ar core 104Extract values associated with the name list from the specified 105core instead of the default 106.Pa /dev/kmem . 107Implies 108.Fl y . 109.It Fl M 110Display system information about shared memory. 111.It Fl N Ar system 112Extract the name list from the specified system instead of the 113default 114.Pa /boot/kernel/kernel . 115Implies 116.Fl y . 117.It Fl Q 118Display system information about messages queues. 119.It Fl S 120Display system information about semaphores. 121.It Fl T 122Display system information about shared memory, message queues 123and semaphores. 124.It Fl y 125Use the 126.Xr kvm 3 127interface instead of the 128.Xr sysctl 3 129interface to extract the required information. 130If 131.Nm 132is to operate on the running system, 133using 134.Xr kvm 3 135will require read privileges to 136.Pa /dev/kmem . 137.It Fl u Ar user 138Display information about IPC mechanisms owned by 139.Pa user . 140User specification can be in the form of a numeric UID or 141a login name. 142.El 143.Pp 144If none of the 145.Fl M , 146.Fl m , 147.Fl Q , 148.Fl q , 149.Fl S , 150or 151.Fl s 152options are specified, information about all active IPC facilities is 153listed. 154.Sh RESTRICTIONS 155System data structures may change while 156.Nm 157is running; the output of 158.Nm 159is not guaranteed to be consistent. 160.Sh FILES 161.Bl -tag -width /boot/kernel/kernel -compact 162.It Pa /dev/kmem 163default kernel memory 164.It Pa /boot/kernel/kernel 165default system name list 166.El 167.Sh SEE ALSO 168.Xr ipcrm 1 169.Sh AUTHORS 170.An Thorsten Lockert Aq Mt tholo@sigmasoft.com 171.Sh BUGS 172This manual page is woefully incomplete, because it does not 173at all attempt to explain the information printed by 174.Nm . 175