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<mqueue.h>(P) POSIX Programmer's Manual <mqueue.h>(P)
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 sigevent structure (as described
in <signal.h> ) and 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>, <sys/types.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 Inter-
faces volume of IEEE Std 1003.1-2001, mq_close(), mq_getattr(),
mq_notify(), mq_open(), mq_receive(), mq_send(), mq_setattr(), mq_time-
dreceive(), mq_timedsend(), mq_unlink()
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 .
IEEE/The Open Group 2003 <mqueue.h>(P)
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This page was generated on Sat Sep 8 16:41:09 GMT 2007
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