RTEMS C User's Guide
The RETURN_PACKET component of the user-provided MPCI layer is called when RTEMS needs to release a packet to the free packet buffer pool. This component should be adhere to the following prototype:
rtems_mpci_entry user_mpci_return_packet( rtems_packet_prefix *packet );
where packet is the address of a packet. If the packet cannot be successfully returned, the fatal error manager should be invoked.
RTEMS C User's Guide
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