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-.\"	$NetBSD: msgrcv.2,v 1.1 1995/10/16 23:49:20 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 July 28, 2016
-.Dt MSGRCV 2
-.Os
-.Sh NAME
-.Nm msgrcv
-.Nd receive a message from a message queue
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In sys/ipc.h
-.In sys/msg.h
-.Ft ssize_t
-.Fn msgrcv "int msqid" "void *msgp" "size_t msgsz" "long msgtyp" "int msgflg"
-.Sh DESCRIPTION
-The
-.Fn msgrcv
-function receives a message from the message queue specified in
-.Fa msqid ,
-and places it into the structure pointed to by
-.Fa msgp .
-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,
-.Va mtext
-is an array of bytes, with a size up to that of the system limit
-.Pf ( Dv MSGMAX ) .
-.Pp
-The value of
-.Fa msgtyp
-has one of the following meanings:
-.Bl -bullet
-.It
-The
-.Fa msgtyp
-argument
-is greater than 0.
-The first message of type
-.Fa msgtyp
-will be received.
-.It
-The
-.Fa msgtyp
-argument
-is equal to 0.
-The first message on the queue will be received.
-.It
-The
-.Fa msgtyp
-argument
-is less than 0.
-The first message of the lowest message type that is
-less than or equal to the absolute value of
-.Fa msgtyp
-will be received.
-.El
-.Pp
-The
-.Fa msgsz
-argument
-specifies the maximum length of the requested message.
-If the received
-message has a length greater than
-.Fa msgsz
-it will be silently truncated if the
-.Dv MSG_NOERROR
-flag is set in
-.Fa msgflg ,
-otherwise an error will be returned.
-.Pp
-If no matching message is present on the message queue specified by
-.Fa msqid ,
-the behavior of
-.Fn msgrcv
-depends on whether the
-.Dv IPC_NOWAIT
-flag is set in
-.Fa msgflg
-or not.
-If
-.Dv IPC_NOWAIT
-is set,
-.Fn msgrcv
-will immediately return a value of -1, and set
-.Va errno
-to
-.Er ENOMSG .
-If
-.Dv IPC_NOWAIT
-is not set, the calling process will be blocked
-until:
-.Bl -bullet
-.It
-A message of the requested type becomes available on the message queue.
-.It
-The message queue is removed, in which case -1 will be returned, and
-.Va errno
-set to
-.Er EINVAL .
-.It
-A signal is received and caught.
--1 is returned, and
-.Va errno
-set to
-.Er EINTR .
-.El
-.Pp
-If a message is successfully received, the data structure associated with
-.Fa msqid
-is updated as follows:
-.Bl -bullet
-.It
-.Va msg_cbytes
-is decremented by the size of the message.
-.It
-.Va msg_lrpid
-is set to the pid of the caller.
-.It
-.Va msg_lrtime
-is set to the current time.
-.It
-.Va msg_qnum
-is decremented by 1.
-.El
-.Sh RETURN VALUES
-Upon successful completion,
-.Fn msgrcv
-returns the number of bytes received into the
-.Va mtext
-field of the structure pointed to by
-.Fa msgp .
-Otherwise, -1 is returned, and
-.Va errno
-set to indicate the error.
-.Sh ERRORS
-The
-.Fn msgrcv
-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 msgrcv
-was waiting for a message of the requested type to become available on it.
-.Pp
-The
-.Fa msgsz
-argument
-is less than 0.
-.It Bq Er E2BIG
-A matching message was received, but its size was greater than
-.Fa msgsz
-and the
-.Dv MSG_NOERROR
-flag was not set in
-.Fa msgflg .
-.It Bq Er EACCES
-The calling process does not have read access to the message queue.
-.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.
-.It Bq Er ENOMSG
-There is no message of the requested type available on the message queue,
-and
-.Dv IPC_NOWAIT
-is set in
-.Fa msgflg .
-.El
-.Sh SEE ALSO
-.Xr msgctl 2 ,
-.Xr msgget 2 ,
-.Xr msgsnd 2
-.Sh HISTORY
-Message queues appeared in the first release of
-.At V .