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-.\"
-.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
-.\"
-.\" 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
-.\"
-.Dd March 4, 2018
-.Dt SHMGET 2
-.Os
-.Sh NAME
-.Nm shmget
-.Nd obtain a shared memory identifier
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/shm.h
-.Ft int
-.Fn shmget "key_t key" "size_t size" "int flag"
-.Sh DESCRIPTION
-Based on the values of
-.Fa key
-and
-.Fa flag ,
-.Fn shmget
-returns the identifier of a newly created or previously existing shared
-memory segment.
-.\"
-.\" The following bit about keys and modes also applies to semaphores
-.\" and message queues.
-.\"
-The key
-is analogous to a filename: it provides a handle that names an
-IPC object.
-There are three ways to specify a key:
-.Bl -bullet
-.It
-IPC_PRIVATE may be specified, in which case a new IPC object
-will be created.
-.It
-An integer constant may be specified.
-If no IPC object corresponding
-to
-.Fa key
-is specified and the IPC_CREAT bit is set in
-.Fa flag ,
-a new one will be created.
-.It
-The
-.Xr ftok 3
-may be used to generate a key from a pathname.
-.El
-.Pp
-The mode of a newly created IPC object is determined by
-which are set by ORing these constants into the
-.Fa flag
-argument:
-.Bl -tag -width 0000
-.It Dv 0400
-Read access for owner.
-.It Dv 0200
-Write access for owner.
-.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
-.\"
-.\" XXX - we should also mention how uid, euid, and gid affect ownership
-.\"	  and use
-.\"
-.\" end section about keys and modes
-.\"
-.Pp
-When creating a new shared memory segment,
-.Fa size
-indicates the desired size of the new segment in bytes.
-The size
-of the segment may be rounded up to a multiple convenient to the
-kernel (i.e., the page size).
-.Sh RETURN VALUES
-Upon successful completion,
-.Fn shmget
-returns the positive integer identifier of a shared memory segment.
-Otherwise, -1 is returned and
-.Va errno
-set to indicate the error.
-.Sh ERRORS
-The
-.Fn shmget
-system call
-will fail if:
-.Bl -tag -width Er
-.\"
-.\" XXX What about ipcperm failing?
-.\"
-.It Bq Er EINVAL
-Size specified is greater than the size of the previously existing segment.
-Size specified is less than the system imposed minimum, or greater than
-the system imposed maximum.
-.It Bq Er ENOENT
-No shared memory segment was found matching
-.Fa key ,
-and IPC_CREAT was not specified.
-.It Bq Er ENOSPC
-The kernel was unable to allocate enough memory to
-satisfy the request.
-.It Bq Er EEXIST
-IPC_CREAT and IPC_EXCL were specified, and a shared memory segment
-corresponding to
-.Fa key
-already exists.
-.El
-.Sh "SEE ALSO"
-.Xr shmat 2 ,
-.Xr shmctl 2 ,
-.Xr shmdt 2 ,
-.Xr ftok 3