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-.\"	$NetBSD: msgsnd.2,v 1.1 1995/10/16 23:49:24 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.
-.\"
-.Dd July 9, 2009
-.Dt MSGSND 2
-.Os
-.Sh NAME
-.Nm msgsnd
-.Nd send a message to a message queue
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In sys/ipc.h
-.In sys/msg.h
-.Ft int
-.Fn msgsnd "int msqid" "const void *msgp" "size_t msgsz" "int msgflg"
-.Sh DESCRIPTION
-The
-.Fn msgsnd
-function sends a message to the message queue specified in
-.Fa msqid .
-The
-.Fa msgp
-argument
-points to a structure containing the message.
-This structure should
-consist of the following members:
-.Bd -literal
-    long mtype;    /* message type */
-    char mtext[1]; /* body of message */
-.Ed
-.Pp
-.Va mtype
-is an integer greater than 0 that can be used for selecting messages (see
-.Xr msgrcv 2 ) ,
-.Va mtext
-is an array of
-.Fa msgsz
-bytes.
-The argument
-.Fa msgsz
-can range from 0 to a system-imposed maximum,
-.Dv MSGMAX .
-.Pp
-If the number of bytes already on the message queue plus
-.Fa msgsz
-is bigger than the maximum number of bytes on the message queue
-.Pf ( Va msg_qbytes ,
-see
-.Xr msgctl 2 ) ,
-or the number of messages on all queues system-wide is already equal to
-the system limit,
-.Fa msgflg
-determines the action of
-.Fn msgsnd .
-If
-.Fa msgflg
-has
-.Dv IPC_NOWAIT
-mask set in it, the call will return immediately.
-If
-.Fa msgflg
-does not have
-.Dv IPC_NOWAIT
-set in it, the call will block until:
-.Bl -bullet
-.It
-The condition which caused the call to block does no longer exist.
-The message will be sent.
-.It
-The message queue is removed, in which case -1 will be returned, and
-.Va errno
-is set to
-.Er EINVAL .
-.It
-The caller catches a signal.
-The call returns with
-.Va errno
-set to
-.Er EINTR .
-.El
-.Pp
-After a successful call, the data structure associated with the message
-queue is updated in the following way:
-.Bl -bullet
-.It
-.Va msg_cbytes
-is incremented by the size of the message.
-.It
-.Va msg_qnum
-is incremented by 1.
-.It
-.Va msg_lspid
-is set to the pid of the calling process.
-.It
-.Va msg_stime
-is set to the current time.
-.El
-.Sh RETURN VALUES
-.Rv -std msgsnd
-.Sh ERRORS
-The
-.Fn msgsnd
-function
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa msqid
-argument
-is not a valid message queue identifier.
-.Pp
-The message queue was removed while
-.Fn msgsnd
-was waiting for a resource to become available in order to deliver the
-message.
-.Pp
-The
-.Fa msgsz
-argument
-is greater than
-.Va msg_qbytes .
-.Pp
-The
-.Fa mtype
-argument
-is not greater than 0.
-.It Bq Er EACCES
-The calling process does not have write access to the message queue.
-.It Bq Er EAGAIN
-There was no space for this message either on the queue, or in the whole
-system, and
-.Dv IPC_NOWAIT
-was set in
-.Fa msgflg .
-.It Bq Er EFAULT
-The
-.Fa msgp
-argument
-points to an invalid address.
-.It Bq Er EINTR
-The system call was interrupted by the delivery of a signal.
-.El
-.Sh HISTORY
-Message queues appeared in the first release of AT&T Unix System V.
-.Sh BUGS
-.Nx
-and
-.Fx
-do not define the
-.Er EIDRM
-error value, which should be used
-in the case of a removed message queue.