mq_setattr(3c) [opensolaris man page]

mq_setattr(3C)						   Standard C Library Functions 					    mq_setattr(3C)

NAME

       mq_setattr - set/get message queue attributes

SYNOPSIS

       #include <mqueue.h>

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

DESCRIPTION

       The  mq_setattr()  function  is	used  to 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 are set to the specified  values  upon
       successful completion of mq_setattr():

       mq_flags     The value of this member is either 0 or  O_NONBLOCK.

       The values of mq_maxmsg, mq_msgsize, and mq_curmsgs are ignored by mq_setattr().

       If  omqstat  is non-NULL, mq_setattr() stores, in the location referenced by omqstat, the previous message queue attributes and the current
       queue status. These values are the same as would be returned by a call to mq_getattr() at that point.

RETURN VALUES

       Upon successful completion, mq_setattr() returns 0 and the attributes of the message queue will have been changed as specified.	Otherwise,
       the message queue attributes are unchanged, and the function returns -1 and sets errno to indicate the error.

ERRORS

       The mq_setattr() function will fail if:

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

       ENOSYS	  The mq_setattr() function is not supported by the system.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       msgctl(2), msgget(2), msgrcv(2), msgsnd(2), mq_getattr(3C), mq_open(3C), mq_receive(3C), mq_send(3C), mqueue.h(3HEAD), attributes(5), stan-
       dards(5)

NOTES

       Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned
       -1 and set errno to ENOSYS.

SunOS 5.11							    5 Feb 2008							    mq_setattr(3C)

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)