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0e85582bc0
This introduces the concept of ext (external/extended) arguments per tcp_pcb (also for listening pcbs) to store more data than just one "void *arg" per pcb. The "arg" is for use to applications, whereas the ext_args may be used by frameworks and leave "arg" untouched. In addition to a void pointer, callbacks are added to help frameworks migrate arguments from listen pcb to connection pcb and to free args when the pcb is freed. Signed-off-by: goldsimon <goldsimon@gmx.de>