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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MSGCTL" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" msgctl 
+.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 \- XSI message control operations
+.SH SYNOPSIS
+.LP
+\fB#include <sys/msg.h>
+.br
+.sp
+int msgctl(int\fP \fImsqid\fP\fB, int\fP \fIcmd\fP\fB, struct msqid_ds
+*\fP\fIbuf\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fImsgctl\fP() function operates on XSI message queues (see the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+Section 3.224, Message Queue). It is unspecified whether this function
+interoperates with the realtime interprocess communication facilities
+defined in \fIRealtime\fP .
+.LP
+The \fImsgctl\fP() function shall provide message control operations
+as specified by \fIcmd\fP. The following values for
+\fIcmd\fP, and the message control operations they specify, are:
+.TP 7
+IPC_STAT
+Place the current value of each member of the \fBmsqid_ds\fP data
+structure associated with \fImsqid\fP into the structure
+pointed to by \fIbuf\fP. The contents of this structure are defined
+in \fI<sys/msg.h>\fP.
+.TP 7
+IPC_SET
+Set the value of the following members of the \fBmsqid_ds\fP data
+structure associated with \fImsqid\fP to the corresponding
+value found in the structure pointed to by \fIbuf\fP: 
+.sp
+.RS
+.nf
+
+\fBmsg_perm.uid
+msg_perm.gid
+msg_perm.mode
+msg_qbytes
+\fP
+.fi
+.RE
+.LP
+IPC_SET can only be executed by a process with appropriate privileges
+or that has an effective user ID equal to the value of
+\fBmsg_perm.cuid\fP or \fBmsg_perm.uid\fP in the \fBmsqid_ds\fP data
+structure associated with \fImsqid\fP. Only a process with
+appropriate privileges can raise the value of \fBmsg_qbytes\fP.
+.TP 7
+IPC_RMID
+Remove the message queue identifier specified by \fImsqid\fP from
+the system and destroy the message queue and \fBmsqid_ds\fP
+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 \fBmsg_perm.cuid\fP or \fBmsg_perm.uid\fP
+in the \fBmsqid_ds\fP data structure
+associated with \fImsqid\fP.
+.sp
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fImsgctl\fP() shall return 0; otherwise,
+it shall return -1 and set \fIerrno\fP to indicate the
+error.
+.SH ERRORS
+.LP
+The \fImsgctl\fP() function shall fail if:
+.TP 7
+.B EACCES
+The argument \fIcmd\fP is IPC_STAT and the calling process does not
+have read permission; see \fIXSI Interprocess Communication\fP .
+.TP 7
+.B EINVAL
+The value of \fImsqid\fP is not a valid message queue identifier;
+or the value of \fIcmd\fP is not a valid command.
+.TP 7
+.B EPERM
+The argument \fIcmd\fP 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 \fBmsg_perm.cuid\fP or \fBmsg_perm.uid\fP in the data
+structure associated with \fImsqid\fP.
+.TP 7
+.B EPERM
+The argument \fIcmd\fP is IPC_SET, an attempt is being made to increase
+to the value of \fBmsg_qbytes\fP, and the effective
+user ID of the calling process does not have appropriate privileges.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+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 \fIXSI Interprocess Communication\fP
+can be easily modified to use the alternative
+interfaces.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIXSI Interprocess Communication\fP, \fIRealtime\fP, \fImq_close\fP(),
+\fImq_getattr\fP(), \fImq_notify\fP(), \fImq_open\fP(), \fImq_receive\fP(),
+\fImq_send\fP(), \fImq_setattr\fP(), \fImq_unlink\fP(), \fImsgget\fP(),
+\fImsgrcv\fP(),
+\fImsgsnd\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<sys/msg.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 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 .