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    Command:

    mq_timedsend

    
    
    

    SYNOPSIS

           #include <mqueue.h>
    
           int mq_send(mqd_t mqdes, const char *msg_ptr,
                         size_t msg_len, unsigned int msg_prio);
    
           #include <time.h>
           #include <mqueue.h>
    
           int mq_timedsend(mqd_t mqdes, const 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_timedsend():
               _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L
    
    
    

    DESCRIPTION

           mq_send()  adds  the message pointed to by msg_ptr to the message queue
           referred to by the descriptor mqdes.  The  msg_len  argument  specifies
           the  length  of  the message pointed to by msg_ptr; this length must be
           less than or equal to the queue's  mq_msgsize  attribute.   Zero-length
           messages are allowed.
    
           The  msg_prio argument is a nonnegative integer that specifies the pri-
           ority of this message.  Messages are placed on the queue in  decreasing
           order  of  priority,  with  newer  messages  of the same priority being
           placed after older messages with the same priority.
    
           If the message queue is already full (i.e., the number of  messages  on
           the  queue  equals  the queue's mq_maxmsg attribute), then, by default,
           mq_send() blocks until sufficient space becomes available to allow  the
           message to be queued, or until 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_timedsend() behaves just like mq_send(), except that if the queue is
           full and the O_NONBLOCK flag is  not  enabled  for  the  message  queue
           description,  then  abs_timeout points to a structure which specifies 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 the message queue is full, and the timeout has  already  expired  by
           EINVAL The call would have blocked, and abs_timeout was invalid, either
                  because tv_sec was less than zero, or because tv_nsec  was  less
                  than zero or greater than 1000 million.
    
           EMSGSIZE
                  msg_len was greater 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_timedsend() is a system call, and mq_send() 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_receive(3),
           mq_unlink(3), mq_overview(7), time(7)
    
    
    

    Linux 2014-01-18 MQ_SEND(3)

    
    
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