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* Makefile (SRCS): Add dummy.c
* dummy.c: New file.
* ethernet.c: Moved ETHER_PORT, READPT, READPTNAME to ...
(struct ether_device): ... here. New struct. ETHER_DEV is now a
pointer to a struct ether_device.
(ethernet_demuxer): New variables edev, dev. Iterate over linked
list ETHER_DEV to find correct readptname. Use dev instead
ETHER_DEV for socket buffer manipulation.
(ethernet_open): New variable edev. Use dev->priv to find correct
edev. Use members of edev instead global variables.
(ethernet_xmit): New variable edev. Use dev->priv to find correct
edev.Use member of edev instead global variable ETHER_PORT.
(setup_ethernet_device): New output argument DEVICE. New
variables edev and dev. Allocate memory for edev, add it to the
head of ETHER_DEV. Use dev instead ETHER_DEV. Use members of edev
instead global variables.
* main.c: ALREADY_OPEN removed.
(find_device): Fix comment. Redone to work with multiple devices
by iterating over DEV_BASE.
(enumerate_device): Likewise.
* pfinet.h: Add new argument to prototype of
setup_ethernet_device. Add prototype for setup_dummy_device.
Remove prototype for ETHER_DEV. Add prototype for DEV_BASE.
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