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[[!meta title="fsys_startup"]]

    routine fsys_startup (
    	bootstrap: mach_port_t;
    	RPT
    	openflags: int;
    	control_port: mach_port_send_t;
    	out realnode: mach_port_send_t);

Sent by filesystem on its bootstrap port upon startup.  `realnode` is the node
this filesystem is the translator for, opened with flags `flags` (`O_NOTRANS`
is assumed even if not provided).