Originální popis anglicky:
mq_setattr - set message queue attributes (
REALTIME)
Návod, kniha: POSIX Programmer's Manual
#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() ,
mq_send() ,
mq_timedsend() ,
msgctl() ,
msgget() ,
msgrcv() ,
msgsnd() , the Base Definitions
volume of IEEE Std 1003.1-2001,
<mqueue.h>
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
.
