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+'\" et
+.TH mqueue.h "0P" 2013 "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
+mqueue.h
+\(em message queues
+(\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+.nf
+#include <mqueue.h>
+.fi
+.SH DESCRIPTION
+The
+.IR <mqueue.h> 
+header shall define the
+.BR mqd_t
+type, which is used for message queue descriptors. This is not an
+array type.
+.P
+The
+.IR <mqueue.h> 
+header shall define the
+.BR pthread_attr_t ,
+.BR size_t ,
+and
+.BR ssize_t
+types as described in
+.IR <sys/types.h> .
+.P
+The
+.IR <mqueue.h> 
+header shall define the
+.BR "struct timespec"
+structure as described in
+.IR <time.h> .
+.P
+The tag
+.BR sigevent
+shall be declared as naming an incomplete structure type, the contents
+of which are described in the
+.IR <signal.h> 
+header.
+.P
+The
+.IR <mqueue.h> 
+header shall define the
+.BR mq_attr
+structure, which is used in getting and setting the attributes of a
+message queue. Attributes are initially set when the message queue is
+created. An
+.BR mq_attr
+structure shall have at least the following fields:
+.sp
+.RS 4
+.nf
+\fB
+long    mq_flags    \fRMessage queue flags.\fP
+long    mq_maxmsg   \fRMaximum number of messages.\fP
+long    mq_msgsize  \fRMaximum message size.\fP
+long    mq_curmsgs  \fRNumber of messages currently queued.\fP
+.fi \fR
+.P
+.RE
+.P
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS 4
+.nf
+\fB
+int      mq_close(mqd_t);
+int      mq_getattr(mqd_t, struct mq_attr *);
+int      mq_notify(mqd_t, const struct sigevent *);
+mqd_t    mq_open(const char *, int, ...);
+ssize_t  mq_receive(mqd_t, char *, size_t, unsigned *);
+int      mq_send(mqd_t, const char *, size_t, unsigned);
+int      mq_setattr(mqd_t, const struct mq_attr *restrict,
+             struct mq_attr *restrict);
+ssize_t  mq_timedreceive(mqd_t, char *restrict, size_t,
+             unsigned *restrict, const struct timespec *restrict);
+int      mq_timedsend(mqd_t, const char *, size_t, unsigned,
+             const struct timespec *);
+int      mq_unlink(const char *);
+.fi \fR
+.P
+.RE
+.P
+Inclusion of the
+.IR <mqueue.h> 
+header may make visible symbols defined in the headers
+.IR <fcntl.h> ,
+.IR <signal.h> ,
+and
+.IR <time.h> .
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fB<fcntl.h>\fP",
+.IR "\fB<signal.h>\fP",
+.IR "\fB<sys_types.h>\fP",
+.IR "\fB<time.h>\fP"
+.P
+The System Interfaces volume of POSIX.1\(hy2008,
+.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\^(\|)"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
+
+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 .