PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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.

NAME         top

       mq_setattr — set message queue attributes (REALTIME)

SYNOPSIS         top

       #include <mqueue.h>

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

DESCRIPTION         top

       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.

RETURN VALUE         top

       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         top

       The mq_setattr() function shall fail if:

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

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       mq_open(3p), mq_send(3p), msgctl(3p), msgget(3p), msgrcv(3p),
       msgsnd(3p)

       The Base Definitions volume of POSIX.1‐2008, mqueue.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- 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 Standard 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)