mqueue.h
Section: POSIX Programmer's Manual (0P)
Updated: 2013
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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.
NAME
mqueue.h
--- message queues
(
REALTIME)
SYNOPSIS
#include <mqueue.h>
DESCRIPTION
The
<mqueue.h>
header shall define the
mqd_t
type, which is used for message queue descriptors. This is not an
array type.
The
<mqueue.h>
header shall define the
pthread_attr_t,
size_t,
and
ssize_t
types as described in
<sys/types.h>.
The
<mqueue.h>
header shall define the
struct timespec
structure as described in
<time.h>.
The tag
sigevent
shall be declared as naming an incomplete structure type, the contents
of which are described in the
<signal.h>
header.
The
<mqueue.h>
header shall define the
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
mq_attr
structure shall have at least the following fields:
-
long mq_flags Message queue flags.
long mq_maxmsg Maximum number of messages.
long mq_msgsize Maximum message size.
long mq_curmsgs Number of messages currently queued.
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided.
-
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 *);
Inclusion of the
<mqueue.h>
header may make visible symbols defined in the headers
<fcntl.h>,
<signal.h>,
and
<time.h>.
The following sections are informative.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<fcntl.h>,
<signal.h>,
<sys_types.h>,
<time.h>
The System Interfaces volume of POSIX.1-2008,
mq_close(),
mq_getattr(),
mq_notify(),
mq_open(),
mq_receive(),
mq_send(),
mq_setattr(),
mq_unlink()
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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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