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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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MQ_GETATTR(3P) POSIX Programmer's Manual MQ_GETATTR(3P)
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.
mq_getattr — get message queue attributes (REALTIME)
#include <mqueue.h>
int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat);
The mq_getattr() function shall obtain status information and
attributes of the message queue and the open message queue
description associated with the message queue descriptor.
The mqdes argument specifies a message queue descriptor.
The results shall be returned in the mq_attr structure referenced
by the mqstat argument.
Upon return, the following members shall have the values
associated with the open message queue description as set when
the message queue was opened and as modified by subsequent
mq_setattr() calls: mq_flags.
The following attributes of the message queue shall be returned
as set at message queue creation: mq_maxmsg, mq_msgsize.
Upon return, the following members within the mq_attr structure
referenced by the mqstat argument shall be set to the current
state of the message queue:
mq_curmsgs
The number of messages currently on the queue.
Upon successful completion, the mq_getattr() function shall
return zero. Otherwise, the function shall return -1 and set
errno to indicate the error.
The mq_getattr() function may fail if:
EBADF The mqdes argument is not a valid message queue
descriptor.
The following sections are informative.
See mq_notify(3p).
None.
None.
None.
mq_notify(3p), mq_open(3p), mq_send(3p), mq_setattr(3p),
msgctl(3p), msgget(3p), msgrcv(3p), msgsnd(3p)
The Base Definitions volume of POSIX.1‐2017, mqueue.h(0p)
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 MQ_GETATTR(3P)
Pages that refer to this page: mqueue.h(0p), mq_open(3p), msgctl(3p), msgget(3p), msgrcv(3p), msgsnd(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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