1 .\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
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28 .\" Portions of this text are reprinted and reproduced in electronic form
29 .\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
30 .\" Portable Operating System Interface (POSIX), The Open Group Base
31 .\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
32 .\" Electrical and Electronics Engineers, Inc and The Open Group. In the
33 .\" event of any discrepancy between this version and the original IEEE and
34 .\" The Open Group Standard, the original IEEE and The Open Group Standard is
35 .\" the referee document. The original Standard can be obtained online at
36 .\" http://www.opengroup.org/unix/online.html.
43 .Nd "set message queue attributes (REALTIME)"
51 .Fa "const struct mq_attr *restrict mqstat"
52 .Fa "struct mq_attr *restrict omqstat"
57 system call sets attributes associated with the open message queue description
58 referenced by the message queue descriptor specified by
60 The message queue attributes corresponding to the following members defined
63 structure will be set to the specified values upon successful completion of
65 .Bl -tag -width ".Va mq_flags"
67 The value of this member is zero or
72 .Va mq_maxmsg , mq_msgsize ,
77 structure are ignored by
80 Upon successful completion, the function returns a value of zero and the
81 attributes of the message queue will have been changed as specified.
83 Otherwise, the message queue attributes are unchanged, and the function
84 returns a value of \-1 and sets the global variable
86 to indicate the error.
96 argument is not a valid message queue descriptor.
105 system call conforms to
110 message queues first appeared in
113 Portions of this text are reprinted and reproduced in electronic form
114 from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
115 Portable Operating System Interface (POSIX), The Open Group Base
116 Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
117 Electrical and Electronics Engineers, Inc and The Open Group. In the
118 event of any discrepancy between this version and the original IEEE and
119 The Open Group Standard, the original IEEE and The Open Group Standard is
120 the referee document. The original Standard can be obtained online at
121 http://www.opengroup.org/unix/online.html.