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mq_getattr(3c) [opensolaris man page]

mq_getattr(3C)						   Standard C Library Functions 					    mq_getattr(3C)

NAME
mq_getattr - get message queue attributes SYNOPSIS
#include <mqueue.h> int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat); DESCRIPTION
The mqdes argument specifies a message queue descriptor. The mq_getattr() function is used to get status information and attributes of the message queue and the open message queue description associated with the message queue descriptor. The results are returned in the mq_attr structure referenced by the mqstat argument. Upon return, the following members will 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(3C) calls: mq_flags message queue flags The following attributes of the message queue are returned as set at message queue creation: mq_maxmsg maximum number of messages mq_msgsize maximum message size mq_curmsgs number of messages currently on the queue. RETURN VALUES
Upon successful completion, the mq_getattr() function returns 0. Otherwise, the function returns -1 and sets errno to indicate the error. ERRORS
The mq_getattr() function will fail if: EBADF The mqdes argument is not a valid message queue descriptor. ENOSYS The mq_getattr() 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), mqueue.h(3HEAD), mq_open(3C), mq_send(3C), mq_setattr(3C), attributes(5), standards(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_getattr(3C)

Check Out this Related Man Page

MQ_GETATTR(2)						      BSD System Calls Manual						     MQ_GETATTR(2)

NAME
mq_getattr -- get message queue attributes (REALTIME) LIBRARY
POSIX Real-time Library (librt, -lrt) SYNOPSIS
#include <mqueue.h> int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat); DESCRIPTION
The mq_getattr() system call obtains status information and attributes of the message queue and the open message queue description associated with the message queue descriptor. The mqdes argument specifies a message queue descriptor. The results are returned in the mq_attr structure referenced by the mqstat argument. Upon return, the following members will 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 will 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 will be set to the current state of the message queue: mq_curmsgs The number of messages currently on the queue. RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The mq_getattr() system call will fail if: [EBADF] The mqdes argument is not a valid message queue descriptor. SEE ALSO
mq_open(2), mq_send(2), mq_setattr(2), mq_timedsend(2) STANDARDS
The mq_getattr() system call conforms to IEEE Std 1003.1-2004 (``POSIX.1''). HISTORY
Support for POSIX message queues first appeared in FreeBSD 7.0. COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Elec- trical 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. BSD
February 21, 2014 BSD
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