mqueue.h(3head) [opensolaris man page]
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(5) 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(5), standards(5) SunOS 5.11 30 Aug 2002 mqueue.h(3HEAD)
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mq_getattr(3RT) Realtime Library Functions mq_getattr(3RT) NAME
mq_getattr - get message queue attributes SYNOPSIS
cc [ flag... ] file... -lrt [ library... ] #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(3RT) 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 |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
msgctl(2), msgget(2), msgrcv(2), msgsnd(2), mqueue.h(3HEAD), mq_open(3RT), mq_send(3RT), mq_setattr(3RT), 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 5.10 28 Jun 2002 mq_getattr(3RT)