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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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mqueue.h(0P) POSIX Programmer's Manual mqueue.h(0P)
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.
mqueue.h — message queues (REALTIME)
#include <mqueue.h>
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.
None.
None.
None.
fcntl.h(0p), signal.h(0p), sys_types.h(0p), time.h(0p)
The System Interfaces volume of POSIX.1‐2017, mq_close(3p),
mq_getattr(3p), mq_notify(3p), mq_open(3p), mq_receive(3p),
mq_send(3p), mq_setattr(3p), mq_unlink(3p)
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 .
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 .
IEEE/The Open Group 2017 mqueue.h(0P)
Pages that refer to this page: mq_close(3p), mq_getattr(3p), mq_notify(3p), mq_open(3p), mq_receive(3p), mq_send(3p), mq_setattr(3p), mq_unlink(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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