[RTEMS Project] #3857: Use EAGAIN for POSIX mq wait in ISR error

[RTEMS trac]

#3857: Use EAGAIN for POSIX mq wait in ISR error
----------------------------+---------------------------
  Reporter:  Joel Sherrill  |      Owner:  Joel Sherrill
      Type:  defect         |     Status:  assigned
  Priority:  normal         |  Milestone:  5.1
 Component:  posix          |    Version:  5
  Severity:  normal         |   Keywords:
Blocked By:                 |   Blocking:
----------------------------+---------------------------
 POSIX message queues which are about to block in an ISR currently return
 ENOMEM. This is a status not listed by POSIX. The better status is EAGAIN
 per
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_receive.html.

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Ticket URL: <http://devel.rtems.org/ticket/3857>
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