Set a queue's attributes
#include <mqueue.h> int mq_setattr( mqd_t mqdes, const struct mq_attr* mqstat, struct mq_attr* omqstat );
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Use the -l mq option to qcc to link against this library.
The mq_setattr() function sets the mq_flags field for the specified queue (passed as the mq_flags field in mqstat). If omqstat isn't NULL, then the old attribute structure is stored in the location that it points to.
|Neutrino supports two implementations of message queues: a traditional implementation, and an alternate one that uses asynchronous messages. For more information, see the entries for mq and mqueue in the Utilities Reference, as well as the Managing POSIX Message Queues technote.|
This function ignores the mq_maxmsg, mq_msgsize, and mq_curmsgs fields of mqstat. The mq_flags field is the bitwise OR of zero or more of the following constants:
|The settings that you make for mq_flags apply only to the given message-queue description (i.e. locally), not to the queue itself.|
-1 if the function couldn't change the attributes (errno is set). Any other value indicates success.
POSIX 1003.1 MSG
mq_getattr(), mq_open(), mq_receive(), mq_send()
mq, mqueue in the Utilities Reference
Managing POSIX Message Queues technote.