Content-type: text/html Man page of mq_getattr

mq_getattr

Section: Realtime Library Functions (3RT)
Updated: 28 Jun 2002
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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 TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
ATTRIBUTES
SEE ALSO
NOTES

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Time: 02:39:04 GMT, October 02, 2010