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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MQ_SETATTR" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" mq_setattr 
+.SH NAME
+mq_setattr \- set message queue attributes (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <mqueue.h>
+.br
+.sp
+int mq_setattr(mqd_t\fP \fImqdes\fP\fB, const struct mq_attr *restrict\fP
+\fImqstat\fP\fB,
+.br
+\ \ \ \ \ \  struct mq_attr *restrict\fP \fIomqstat\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fImq_setattr\fP() function shall set attributes associated with
+the open message queue description referenced by the
+message queue descriptor specified by \fImqdes\fP.
+.LP
+The message queue attributes corresponding to the following members
+defined in the \fBmq_attr\fP structure shall be set to the
+specified values upon successful completion of \fImq_setattr\fP():
+.TP 7
+\fImq_flags\fP
+The value of this member is the bitwise-logical OR of zero or more
+of O_NONBLOCK and any implementation-defined flags.
+.sp
+.LP
+The values of the \fImq_maxmsg\fP, \fImq_msgsize\fP, and \fImq_curmsgs\fP
+members of the \fBmq_attr\fP structure shall be
+ignored by \fImq_setattr\fP().
+.LP
+If \fIomqstat\fP is non-NULL, the \fImq_setattr\fP() function shall
+store, in the location referenced by \fIomqstat\fP, the
+previous message queue attributes and the current queue status. These
+values shall be the same as would be returned by a call to \fImq_getattr\fP()
+at that point.
+.SH RETURN VALUE
+.LP
+Upon successful completion, the function shall return a value of zero
+and the attributes of the message queue shall have been
+changed as specified.
+.LP
+Otherwise, the message queue attributes shall be unchanged, and the
+function shall return a value of -1 and set \fIerrno\fP to
+indicate the error.
+.SH ERRORS
+.LP
+The \fImq_setattr\fP() function shall fail if:
+.TP 7
+.B EBADF
+The \fImqdes\fP argument is not a valid message queue descriptor.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fImq_open\fP() , \fImq_send\fP() , \fImq_timedsend\fP() , \fImsgctl\fP()
+, \fImsgget\fP() , \fImsgrcv\fP() , \fImsgsnd\fP() , the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<mqueue.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 .