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-.\"	$NetBSD: msgget.2,v 1.1 1995/10/16 23:49:19 jtc Exp $
-.\"
-.\" Copyright (c) 1995 Frank van der Linden
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"      This product includes software developed for the NetBSD Project
-.\"      by Frank van der Linden
-.\" 4. The name of the author may not be used to endorse or promote products
-.\"    derived from this software without specific prior written permission
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\" $FreeBSD$
-.\"
-.\"/
-.Dd March 4, 2018
-.Dt MSGGET 2
-.Os
-.Sh NAME
-.Nm msgget
-.Nd get message queue
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/msg.h
-.Ft int
-.Fn msgget "key_t key" "int msgflg"
-.Sh DESCRIPTION
-The
-.Fn msgget
-function
-returns the message queue identifier associated with
-.Fa key .
-A message queue identifier is a unique integer greater than zero.
-.Pp
-A message queue is created if either
-.Fa key
-is equal to
-.Dv IPC_PRIVATE ,
-or
-.Fa key
-does not have a message queue identifier associated with it, and the
-.Dv IPC_CREAT
-bit is set in
-.Fa msgflg .
-.Pp
-If a new message queue is created, the data structure associated with it (the
-.Va msqid_ds
-structure, see
-.Xr msgctl 2 )
-is initialized as follows:
-.Bl -bullet
-.It
-.Va msg_perm.cuid
-and
-.Va msg_perm.uid
-are set to the effective uid of the calling process.
-.It
-.Va msg_perm.gid
-and
-.Va msg_perm.cgid
-are set to the effective gid of the calling process.
-.It
-.Va msg_perm.mode
-is set to the lower 9 bits of
-.Fa msgflg
-which are set by ORing these constants:
-.Bl -tag -width 0000
-.It Dv 0400
-Read access for user.
-.It Dv 0200
-Write access for user.
-.It Dv 0040
-Read access for group.
-.It Dv 0020
-Write access for group.
-.It Dv 0004
-Read access for other.
-.It Dv 0002
-Write access for other.
-.El
-.It
-.Va msg_cbytes ,
-.Va msg_qnum ,
-.Va msg_lspid ,
-.Va msg_lrpid ,
-.Va msg_rtime ,
-and
-.Va msg_stime
-are set to 0.
-.It
-.Va msg_qbytes
-is set to the system wide maximum value for the number of bytes in a queue
-.Pf ( Dv MSGMNB ) .
-.It
-.Va msg_ctime
-is set to the current time.
-.El
-.Sh RETURN VALUES
-Upon successful completion a positive message queue identifier is returned.
-Otherwise, -1 is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EACCES
-A message queue is already associated with
-.Fa key
-and the caller has no permission to access it.
-.It Bq Er EEXIST
-Both
-.Dv IPC_CREAT
-and
-.Dv IPC_EXCL
-are set in
-.Fa msgflg ,
-and a message queue is already associated with
-.Fa key .
-.It Bq Er ENOSPC
-A new message queue could not be created because the system limit for
-the number of message queues has been reached.
-.It Bq Er ENOENT
-.Dv IPC_CREAT
-was not set in
-.Fa msgflg
-and no message queue associated with
-.Fa key
-was found.
-.El
-.Sh SEE ALSO
-.Xr msgctl 2 ,
-.Xr msgrcv 2 ,
-.Xr msgsnd 2
-.Sh HISTORY
-Message queues appeared in the first release of
-.At V .