posix man page for mq_setattr

MQ_SETATTR(3P)						     POSIX Programmer's Manual						    MQ_SETATTR(3P)

PROLOG
       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
       mq_setattr -- set message queue attributes (REALTIME)

SYNOPSIS
       #include <mqueue.h>

       int mq_setattr(mqd_t mqdes, const struct mq_attr *restrict mqstat,
	   struct mq_attr *restrict omqstat);

DESCRIPTION
       The mq_setattr() function shall set attributes associated with the open message queue description referenced by the message queue  descrip-
       tor 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.

RETURN VALUE
       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.

ERRORS
       The mq_setattr() function shall fail if:

       EBADF  The mqdes argument is not a valid message queue descriptor.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       mq_open(), mq_send(), msgctl(), msgget(), msgrcv(), msgsnd()

       The Base Definitions volume of POSIX.1-2008, <mqueue.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/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						       2013							    MQ_SETATTR(3P)