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'\" te .\" Copyright (c) 2008, 2020, Oracle and/or its affiliates. .\" Portions Copyright (c) 1992, The X/Open Company Ltd. All rights reserved. .\" Oracle gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, 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 Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions 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. This notice shall appear on any product containing this material. .TH mq_getattr 3C "31 Jan 2012" "Oracle Solaris 11.4" "Standard C Library Functions" .SH NAME mq_getattr \- get message queue attributes .SH SYNOPSIS .LP .nf #include <mqueue.h> \fBint\fR \fBmq_getattr\fR(\fBmqd_t\fR \fImqdes\fR, \fBstruct mq_attr *\fR\fImqstat\fR); .fi .SH DESCRIPTION .sp .LP The \fImqdes\fR argument specifies a message queue descriptor. The \fBmq_getattr()\fR 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 \fImq_attr\fR structure referenced by the \fImqstat\fR argument. .sp .LP 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 \fBmq_setattr\fR(3C) calls: .sp .ne 2 .mk .na \fB\fBmq_flags\fR\fR .ad .RS 12n .rt message queue flags .RE .sp .LP The following attributes of the message queue are returned as set at message queue creation: .sp .ne 2 .mk .na \fB\fBmq_maxmsg\fR\fR .ad .RS 14n .rt maximum number of messages .RE .sp .ne 2 .mk .na \fB\fBmq_msgsize\fR\fR .ad .RS 14n .rt maximum message size .RE .sp .ne 2 .mk .na \fB\fBmq_curmsgs\fR\fR .ad .RS 14n .rt number of messages currently on the queue. .RE .SH RETURN VALUES .sp .LP Upon successful completion, the \fBmq_getattr()\fR function returns \fB0\fR. Otherwise, the function returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error. .SH ERRORS .sp .LP The \fBmq_getattr()\fR function will fail if: .sp .ne 2 .mk .na \fB\fBEBADF\fR\fR .ad .RS 10n .rt The \fImqdes\fR argument is not a valid message queue descriptor. .RE .sp .ne 2 .mk .na \fB\fBENOSYS\fR\fR .ad .RS 10n .rt The \fBmq_getattr()\fR function is not supported by the system. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level MT-Safe _ Standard See \fBstandards\fR(7). .TE .sp .SH SEE ALSO .sp .LP \fBmsgctl\fR(2), \fBmsgget\fR(2), \fBmsgrcv\fR(2), \fBmsgsnd\fR(2), \fBmq_open\fR(3C), \fBmq_send\fR(3C), \fBmq_setattr\fR(3C), \fBmqueue.h\fR(3HEAD), \fBattributes\fR(7), \fBstandards\fR(7)