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.\" $FreeBSD$ 31.\" 32.Dd March 24, 2004 33.Dt "IPCS" 1 34.Os 35.Sh NAME 36.Nm ipcs 37.Nd report System V interprocess communication facilities status 38.Sh SYNOPSIS 39.Nm 40.Op Fl abcmopqstMQSTy 41.Op Fl C Ar core 42.Op Fl N Ar system 43.Op Fl u Ar user 44.Sh DESCRIPTION 45The 46.Nm 47utility provides information on System V interprocess communication 48(IPC) facilities on the system. 49.Pp 50The options are as follows: 51.Bl -tag -width Ds 52.It Fl a 53Show the maximum amount of information possible when 54displaying active semaphores, message queues, 55and shared memory segments. 56(This is shorthand for specifying the 57.Fl b , 58.Fl c , 59.Fl o , 60.Fl p , 61and 62.Fl t 63options.) 64.It Fl b 65Show the maximum allowed sizes for active semaphores, message queues, 66and shared memory segments. 67The 68.Dq maximum allowed size 69is the maximum number of bytes in a message on a message queue, 70the size of a shared memory segment, 71or the number of semaphores in a set of semaphores. 72.It Fl c 73Show the creator's name and group for active semaphores, message queues, 74and shared memory segments. 75.It Fl m 76Display information about active shared memory segments. 77.It Fl o 78Show outstanding usage for active message queues, 79and shared memory segments. 80The 81.Dq outstanding usage 82is the number of messages in a message queue, or the number 83of processes attached to a shared memory segment. 84.It Fl p 85Show the process ID information for active semaphores, message queues, 86and shared memory segments. 87The 88.Dq process ID information 89is the last process to send a message to or receive a message from 90a message queue, 91the process that created a semaphore, or the last process to attach 92or detach a shared memory segment. 93.It Fl q 94Display information about active message queues. 95.It Fl s 96Display information about active semaphores. 97.It Fl t 98Show access times for active semaphores, message queues, 99and shared memory segments. 100The access times is the time 101of the last control operation on an IPC object, 102the last send or receive of a message, 103the last attach or detach of a shared memory segment, 104or the last operation on a semaphore. 105.It Fl C Ar core 106Extract values associated with the name list from the specified 107core instead of the default 108.Pa /dev/kmem . 109Implies 110.Fl y . 111.It Fl M 112Display system information about shared memory. 113.It Fl N Ar system 114Extract the name list from the specified system instead of the 115default 116.Pa /boot/kernel/kernel . 117Implies 118.Fl y . 119.It Fl Q 120Display system information about messages queues. 121.It Fl S 122Display system information about semaphores. 123.It Fl T 124Display system information about shared memory, message queues 125and semaphores. 126.It Fl y 127Use the 128.Xr kvm 3 129interface instead of the 130.Xr sysctl 3 131interface to extract the required information. 132If 133.Nm 134is to operate on the running system, 135using 136.Xr kvm 3 137will require read privileges to 138.Pa /dev/kmem . 139.It Fl u Ar user 140Display information about IPC mechanisms owned by 141.Pa user . 142User specification can be in the form of a numeric UID or 143a login name. 144.El 145.Pp 146If none of the 147.Fl M , 148.Fl m , 149.Fl Q , 150.Fl q , 151.Fl S , 152or 153.Fl s 154options are specified, information about all active IPC facilities is 155listed. 156.Sh RESTRICTIONS 157System data structures may change while 158.Nm 159is running; the output of 160.Nm 161is not guaranteed to be consistent. 162.Sh FILES 163.Bl -tag -width /boot/kernel/kernel -compact 164.It Pa /dev/kmem 165default kernel memory 166.It Pa /boot/kernel/kernel 167default system name list 168.El 169.Sh SEE ALSO 170.Xr ipcrm 1 171.Sh AUTHORS 172.An Thorsten Lockert Aq tholo@sigmasoft.com 173.Sh BUGS 174This manual page is woefully incomplete, because it does not 175at all attempt to explain the information printed by 176.Nm . 177