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+'\" et
+.TH MSGCTL "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+msgctl
+\(em XSI message control operations
+.SH SYNOPSIS
+.LP
+.nf
+#include <sys/msg.h>
+.P
+int msgctl(int \fImsqid\fP, int \fIcmd\fP, struct msqid_ds *\fIbuf\fP);
+.fi
+.SH DESCRIPTION
+The
+\fImsgctl\fR()
+function operates on XSI message queues (see the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.226" ", " "Message Queue").
+It is unspecified whether this function interoperates with the
+realtime interprocess communication facilities defined in
+.IR "Section 2.8" ", " "Realtime".
+.P
+The
+\fImsgctl\fR()
+function shall provide message control operations as specified by
+.IR cmd .
+The following values for
+.IR cmd ,
+and the message control operations they specify, are:
+.IP IPC_STAT 12
+Place the current value of each member of the
+.BR msqid_ds
+data structure associated with
+.IR msqid
+into the structure pointed to by
+.IR buf .
+The contents of this structure are defined in
+.IR <sys/msg.h> .
+.IP IPC_SET 12
+Set the value of the following members of the
+.BR msqid_ds
+data structure associated with
+.IR msqid
+to the corresponding value found in the structure pointed to by
+.IR buf :
+.RS 12 
+.sp
+.RS 4
+.nf
+
+msg_perm.uid
+msg_perm.gid
+msg_perm.mode
+msg_qbytes
+.fi
+.P
+.RE
+.P
+Also, the
+.IR msg_ctime
+timestamp shall be set to the current time, as described in
+.IR "Section 2.7.1" ", " "IPC General Description".
+.P
+IPC_SET can only be executed by a process with appropriate privileges
+or that has an effective user ID equal to the value of
+.BR msg_perm.cuid
+or
+.BR msg_perm.uid
+in the
+.BR msqid_ds
+data structure associated with
+.IR msqid .
+Only a process with appropriate privileges can raise the value of
+.BR msg_qbytes .
+.RE
+.IP IPC_RMID 12
+Remove the message queue identifier specified by
+.IR msqid
+from the system and destroy the message queue and
+.BR msqid_ds
+data structure associated with it. IPC_RMD can only be executed by a
+process with appropriate privileges or one that has an effective user
+ID equal to the value of
+.BR msg_perm.cuid
+or
+.BR msg_perm.uid
+in the
+.BR msqid_ds
+data structure associated with
+.IR msqid .
+.SH "RETURN VALUE"
+Upon successful completion,
+\fImsgctl\fR()
+shall return 0; otherwise, it shall return \-1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fImsgctl\fR()
+function shall fail if:
+.TP
+.BR EACCES
+The argument
+.IR cmd
+is IPC_STAT and the calling process does not have read permission; see
+.IR "Section 2.7" ", " "XSI Interprocess Communication".
+.TP
+.BR EINVAL
+The value of
+.IR msqid
+is not a valid message queue identifier; or the value of
+.IR cmd
+is not a valid command.
+.TP
+.BR EPERM
+The argument
+.IR cmd
+is IPC_RMID or IPC_SET
+and the effective user ID of the calling process is not equal to that
+of a process with appropriate privileges and it is not equal to the
+value of
+.BR msg_perm.cuid
+or
+.BR msg_perm.uid
+in the data structure associated with
+.IR msqid .
+.TP
+.BR EPERM
+The argument
+.IR cmd
+is IPC_SET, an attempt is being made to increase to the value of
+.BR msg_qbytes ,
+and the effective user ID of the calling process does not have
+appropriate privileges.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+The POSIX Realtime Extension defines alternative interfaces for interprocess communication
+(IPC). Application developers who need to use IPC should design their
+applications so that modules using the IPC routines described in
+.IR "Section 2.7" ", " "XSI Interprocess Communication"
+can be easily modified to use the alternative interfaces.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.7" ", " "XSI Interprocess Communication",
+.IR "Section 2.8" ", " "Realtime",
+.IR "\fImq_close\fR\^(\|)",
+.IR "\fImq_getattr\fR\^(\|)",
+.IR "\fImq_notify\fR\^(\|)",
+.IR "\fImq_open\fR\^(\|)",
+.IR "\fImq_receive\fR\^(\|)",
+.IR "\fImq_send\fR\^(\|)",
+.IR "\fImq_setattr\fR\^(\|)",
+.IR "\fImq_unlink\fR\^(\|)",
+.IR "\fImsgget\fR\^(\|)",
+.IR "\fImsgrcv\fR\^(\|)",
+.IR "\fImsgsnd\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.226" ", " "Message Queue",
+.IR "\fB<sys_msg.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .