Have a look at these codes:
drivers/libc_backend.h
drivers/glue_libc.cc
drivers/console.cpp
drivers/uart.cpp
lib/vprintf.c


On Sat, Jun 21, 2014 at 5:11 AM, Yuxin Ren <ryx@gwmail.gwu.edu> wrote:
Hi,

I think printf usually invoke system call. But in Fiasco only one system call is capability invocation. So what capability is invoked by printf? Or Fiasco implements printf in user level, so printf triggers a normal IPC? 

Thank you.
Best

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