1.\" $NetBSD: ipcs.1,v 1.20 2014/06/11 14:57:55 joerg Exp $ 2.\" 3.\" Copyright (c) 1994 SigmaSoft, Th. Lockert 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd June 11, 2014 27.Dt IPCS 1 28.Os 29.Sh NAME 30.Nm ipcs 31.Nd report System V interprocess communication facilities status 32.Sh SYNOPSIS 33.Nm 34.Op Fl abcmopqstMQST 35.Sh DESCRIPTION 36The 37.Nm 38program provides information on System V interprocess communication 39(IPC) facilities on the system. 40.Pp 41The options are as follows: 42.Bl -tag -width Ds 43.It Fl a 44Show the maximum amount of information possible when 45displaying active semaphores, message queues, 46and shared memory segments. 47(This is shorthand for specifying the 48.Fl b , 49.Fl c , 50.Fl o , 51.Fl p , 52and 53.Fl t 54options.) 55.It Fl b 56Show the maximum allowed sizes for active semaphores, message queues, 57and shared memory segments. 58The 59.Dq maximum allowed size 60is the maximum number of bytes in a message on a message queue, 61the size of a shared memory segment, 62or the number of semaphores in a set of semaphores. 63.It Fl c 64Show the creator's name and group for active semaphores, message queues, 65and shared memory segments. 66.It Fl m 67Display information about active shared memory segments. 68.It Fl o 69Show outstanding usage for active message queues, 70and shared memory segments. 71The 72.Dq outstanding usage 73is the number of messages in a message queue, or the number 74of processes attached to a shared memory segment. 75.It Fl p 76Show the process ID information for active semaphores, message queues, 77and shared memory segments. 78The 79.Dq process ID information 80is the last process to send a message to or receive a message from 81a message queue, 82the process that created a semaphore, or the last process to attach 83or detach a shared memory segment. 84.It Fl q 85Display information about active message queues. 86.It Fl s 87Display information about active semaphores. 88.It Fl t 89Show access times for active semaphores, message queues, 90and shared memory segments. 91The access times is the time 92of the last control operation on an IPC object, 93the last send or receive of a message, 94the last attach or detach of a shared memory segment, 95or the last operation on a semaphore. 96.It Fl M 97Display system information about shared memory. 98.It Fl Q 99Display system information about messages queues. 100.It Fl S 101Display system information about semaphores. 102.It Fl T 103Display system information about shared memory, message queues 104and semaphores. 105(This is shorthand for specifying the 106.Fl M , 107.Fl Q , 108and 109.Fl S 110options.) 111.El 112.Pp 113If none of the 114.Fl M , 115.Fl m , 116.Fl Q , 117.Fl q , 118.Fl S , 119.Fl s , 120or 121.Fl T 122options are specified, information about all active IPC facilities is 123listed. 124.Sh RESTRICTIONS 125System data structures may change while 126.Nm 127is running; the output of 128.Nm 129is not guaranteed to be consistent. 130.Sh SEE ALSO 131.Xr ipcrm 1 , 132.Xr shmat 2 , 133.Xr shmctl 2 , 134.Xr shmdt 2 , 135.Xr shmget 2 136.Sh AUTHORS 137.An Thorsten Lockert Aq Mt tholo@sigmasoft.com 138.Sh BUGS 139This manual page is woefully incomplete, because it does not 140at all attempt to explain the information printed by 141.Nm . 142