MQUEUE.H(3HEAD) Headers MQUEUE.H(3HEAD)

NAME

mqueue.h, mqueue - message queues

SYNOPSIS

#include <mqueue.h>

DESCRIPTION

The <mqueue.h> header defines the mqd_t type, which is used for
message queue descriptors. This will not be an array type. A
message queue descriptor may be implemented using a file descriptor,
in which case applications can open up to at least OPEN_MAX file and
message queues.


The <mqueue.h> header defines the sigevent structure (as described in
<signal.h>, see signal.h(3HEAD)) and the mq_attr structure, which is
used in getting and setting the attributes of a message queue.
Attributes are initially set when the message queue is created. A
mq_attr structure has the following members:

long mq_flags message queue flags
long mq_maxmsg maximum number of messages
long mq_msgsize maximum message size
long mq_curmsgs number of messages currently queued


Inclusion of the <mqueue.h> header may make visible symbols defined
in the headers <fcntl.h>, <signal.h>, <sys/types.h>, and <time.h>.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+

SEE ALSO

fcntl.h(3HEAD), signal.h(3HEAD), time.h(3HEAD), types.h(3HEAD),
attributes(7), standards(7)

August 30, 2002 MQUEUE.H(3HEAD)