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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_SETATTR(3P) POSIX Programmer's Manual MQ_SETATTR(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_setattr — set message queue attributes (REALTIME)
#include <mqueue.h>
int mq_setattr(mqd_t mqdes, const struct mq_attr *restrict mqstat,
struct mq_attr *restrict omqstat);
The mq_setattr() function shall set attributes associated with
the open message queue description referenced by the message
queue descriptor specified by mqdes.
The message queue attributes corresponding to the following
members defined in the mq_attr structure shall be set to the
specified values upon successful completion of mq_setattr():
mq_flags The value of this member is the bitwise-logical OR of
zero or more of O_NONBLOCK and any implementation-
defined flags.
The values of the mq_maxmsg, mq_msgsize, and mq_curmsgs members
of the mq_attr structure shall be ignored by mq_setattr().
If omqstat is non-NULL, the mq_setattr() function shall store, in
the location referenced by omqstat, the previous message queue
attributes and the current queue status. These values shall be
the same as would be returned by a call to mq_getattr() at that
point.
Upon successful completion, the function shall return a value of
zero and the attributes of the message queue shall have been
changed as specified.
Otherwise, the message queue attributes shall be unchanged, and
the function shall return a value of -1 and set errno to indicate
the error.
The mq_setattr() function shall fail if:
EBADF The mqdes argument is not a valid message queue
descriptor.
The following sections are informative.
None.
None.
None.
None.
mq_open(3p), mq_send(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_SETATTR(3P)
Pages that refer to this page: mqueue.h(0p), mq_getattr(3p), mq_open(3p), mq_send(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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