mq_getattr(3p) [suse man page]

MQ_GETATTR(3P)						     POSIX Programmer's Manual						    MQ_GETATTR(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_getattr - get message queue attributes (REALTIME)

SYNOPSIS

       #include <mqueue.h>

       int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat);

DESCRIPTION

       The mq_getattr() function shall obtain status information and attributes of the message queue and the open message queue description  asso-
       ciated 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.

RETURN VALUE

       Upon  successful completion, the mq_getattr() function shall return zero. Otherwise, the function shall return -1 and set errno to indicate
       the error.

ERRORS

       The mq_getattr() 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(),  mq_setattr(),  mq_timedsend(),  msgctl(),  msgget(),  msgrcv(),	msgsnd(),   the   Base	 Definitions   volume	of
       IEEE Std 1003.1-2001, <mqueue.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003							    MQ_GETATTR(3P)

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(),  mq_timedsend(),	msgctl(),  msgget(),  msgrcv(),  msgsnd(),  the  Base  Definitions volume of IEEE Std 1003.1-2001,
       <mqueue.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003							    MQ_SETATTR(3P)