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)