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+.\"	$NetBSD: msgctl.2,v 1.16 2026/01/02 22:22:22 nia 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. 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 August 25, 1999
+.Dt MSGCTL 2
+.Os
+.Sh NAME
+.Nm msgctl
+.Nd message control operations
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/msg.h
+.Ft int
+.Fn msgctl "int msqid" "int cmd" "struct msqid_ds *buf"
+.Sh DESCRIPTION
+The
+.Fn msgctl
+system call performs control operations on the message queue specified
+by
+.Fa msqid .
+.Pp
+Each message queue has a
+.Sy msqid_ds
+structure associated with it which contains the following members:
+.Bd -literal
+    struct ipc_perm msg_perm; /* msg queue permission bits */
+    msgqnum_t msg_qnum;       /* # of msgs in the queue */
+    msglen_t  msg_qbytes;     /* max # of bytes on the queue */
+    pid_t     msg_lspid;      /* pid of last msgsnd() */
+    pid_t     msg_lrpid;      /* pid of last msgrcv() */
+    time_t    msg_stime;      /* time of last msgsnd() */
+    time_t    msg_rtime;      /* time of last msgrcv() */
+    time_t    msg_ctime;      /* time of last msgctl() */
+.Ed
+.Pp
+The
+.Sy ipc_perm
+structure used inside the
+.Sy msgid_ds
+structure is defined in
+.In sys/ipc.h
+and contains the following members:
+.Bd -literal
+    uid_t cuid;  /* creator user id */
+    gid_t cgid;  /* creator group id */
+    uid_t uid;   /* user id */
+    gid_t gid;   /* group id */
+    mode_t mode; /* permission (lower 9 bits) */
+.Ed
+.Pp
+The operation to be performed by
+.Fn msgctl
+is specified in
+.Fa cmd
+and is one of:
+.Bl -tag -width IPC_RMIDX
+.It Dv IPC_STAT
+Gather information about the message queue and place it in the
+structure pointed to by
+.Fa buf .
+.It Dv IPC_SET
+Set the value of the
+.Va msg_perm.uid ,
+.Va msg_perm.gid ,
+.Va msg_perm.mode
+and
+.Va msg_qbytes
+fields in the structure associated with
+.Fa msqid .
+The values are taken from the corresponding fields in the structure
+pointed to by
+.Fa buf .
+This operation can only be executed by the super-user, or a process that
+has an effective user id equal to either
+.Va msg_perm.cuid
+or
+.Va msg_perm.uid
+in the data structure associated with the message queue.
+The value of
+.Va msg_qbytes
+can only be increased by the super-user.
+Values for
+.Va msg_qbytes
+that exceed the system limit
+.Pf ( Dv MSGMNB
+from
+.In sys/msg.h )
+are silently truncated to that limit.
+.It Dv IPC_RMID
+Remove the message queue specified by
+.Fa msqid
+and destroy the data associated with it.
+Only the super-user or a process with an effective uid equal to the
+.Va msg_perm.cuid
+or
+.Va msg_perm.uid
+values in the data structure associated with the queue can do this.
+.El
+.Pp
+The permission to read from or write to a message queue (see
+.Xr msgsnd 2
+and
+.Xr msgrcv 2 )
+is determined by the
+.Va msg_perm.mode
+field in the same way as is done with files (see
+.Xr chmod 2 ) ,
+but the effective uid can match either the
+.Va msg_perm.cuid
+field or the
+.Va msg_perm.uid
+field, and the
+effective gid can match either
+.Va msg_perm.cgid
+or
+.Va msg_perm.gid .
+.Sh RETURN VALUES
+Upon successful completion, a value of 0 is returned.
+Otherwise, \-1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn msgctl
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+.Fa cmd
+is equal to
+.Dv IPC_SET
+or
+.Dv IPC_RMID
+and the caller is not the super-user, nor does
+the effective uid match either the
+.Va msg_perm.uid
+or
+.Va msg_perm.cuid
+fields of the data structure associated with the message queue.
+.Pp
+An attempt was made to increase the value of
+.Va msg_qbytes
+through
+.Dv IPC_SET ,
+but the caller is not the super-user.
+.It Bq Er EACCES
+.Fa cmd
+is
+.Dv IPC_STAT
+and the caller has no read permission for this message queue.
+.It Bq Er EINVAL
+.Fa msqid
+is not a valid message queue identifier.
+.Pp
+.Fa cmd
+is not a valid command.
+.It Bq Er EFAULT
+.Fa buf
+specifies an invalid address.
+.El
+.Sh SEE ALSO
+.Xr msgget 2 ,
+.Xr msgrcv 2 ,
+.Xr msgsnd 2
+.Sh STANDARDS
+The
+.Nm
+system call conforms to
+.St -xsh5 .
+.Sh HISTORY
+Message queues appeared in the first release of
+.At V .