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    Command:

    mq_timedreceive

    
    
    

    SYNOPSIS

           #include <mqueue.h>
    
           ssize_t mq_receive(mqd_t mqdes, char *msg_ptr,
                              size_t msg_len, unsigned int *msg_prio);
    
           #include <time.h>
           #include <mqueue.h>
    
           ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr,
                              size_t msg_len, unsigned int *msg_prio,
                              const struct timespec *abs_timeout);
    
           Link with -lrt.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           mq_timedreceive():
               _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
    
    
    

    DESCRIPTION

           mq_receive()  removes the oldest message with the highest priority from
           the message queue referred to by the descriptor mqdes, and places it in
           the  buffer  pointed to by msg_ptr.  The msg_len argument specifies the
           size of the buffer pointed to by msg_ptr; this must be greater than  or
           equal to the mq_msgsize attribute of the queue (see mq_getattr(3)).  If
           msg_prio is not NULL, then the buffer to which it  points  is  used  to
           return the priority associated with the received message.
    
           If  the  queue  is empty, then, by default, mq_receive() blocks until a
           message becomes available, or the call is interrupted by a signal  han-
           dler.  If the O_NONBLOCK flag is enabled for the message queue descrip-
           tion, then the call instead fails immediately with the error EAGAIN.
    
           mq_timedreceive() behaves just like mq_receive(), except  that  if  the
           queue  is  empty and the O_NONBLOCK flag is not enabled for the message
           queue description, then abs_timeout points to a structure which  speci-
           fies a ceiling on the time for which the call will block.  This ceiling
           is an absolute timeout in seconds  and  nanoseconds  since  the  Epoch,
           1970-01-01  00:00:00  +0000 (UTC), and it is specified in the following
           structure:
    
               struct timespec {
                   time_t tv_sec;        /* seconds */
                   long   tv_nsec;       /* nanoseconds */
               };
    
           If no message is available, and the timeout has already expired by  the
           time of the call, mq_timedreceive() returns immediately.
    
    
    

    RETURN VALUE

           On  success,  mq_receive()  and  mq_timedreceive() return the number of
    
           EMSGSIZE
                  msg_len was less than the mq_msgsize attribute  of  the  message
                  queue.
    
           ETIMEDOUT
                  The call timed out before a message could be transferred.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    NOTES

           On  Linux,  mq_timedreceive()  is  a system call, and mq_receive() is a
           library function layered on top of that system call.
    
    
    

    SEE ALSO

           mq_close(3),  mq_getattr(3),  mq_notify(3),   mq_open(3),   mq_send(3),
           mq_unlink(3), mq_overview(7), time(7)
    
    
    

    Linux 2014-01-18 MQ_RECEIVE(3)

    
    
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