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46 .TH MQUEUE.H 3HEAD "Aug 30, 2002"
48 mqueue.h, mqueue \- message queues
52 \fB#include <mqueue.h>\fR
58 The <\fBmqueue.h\fR> header defines the \fBmqd_t\fR type, which is used for
59 message queue descriptors. This will not be an array type. A message queue
60 descriptor may be implemented using a file descriptor, in which case
61 applications can open up to at least \fBOPEN_MAX\fR file and message queues.
64 The <\fBmqueue.h\fR> header defines the \fBsigevent\fR structure (as described
65 in <\fBsignal.h\fR>, see \fBsignal.h\fR(3HEAD)) and the \fBmq_attr\fR
66 structure, which is used in getting and setting the attributes of a message
67 queue. Attributes are initially set when the message queue is created. A
68 \fBmq_attr\fR structure has the following members:
72 \fBlong mq_flags message queue flags
73 long mq_maxmsg maximum number of messages
74 long mq_msgsize maximum message size
75 long mq_curmsgs number of messages currently queued\fR
82 Inclusion of the <\fBmqueue.h\fR> header may make visible symbols defined in
83 the headers <\fBfcntl.h\fR>, <\fBsignal.h\fR>, <\fBsys/types.h\fR>, and
88 See \fBattributes\fR(5) for descriptions of the following attributes:
96 ATTRIBUTE TYPE ATTRIBUTE VALUE
98 Interface Stability Standard
104 \fBfcntl.h\fR(3HEAD), \fBsignal.h\fR(3HEAD), \fBtime.h\fR(3HEAD),
105 \fBtypes.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)