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2017-10-05 19:19 GMT-07:00 Yubin Ruan <ablacktshirt@gmail.com>:

Hi,
I am looking for the implementation of open() in the src, but so far I
am not able to do this.

In Python 3, builtins.open is the same as io.open, which is implemented in the \_io\_open function in Modules/\_io/\_iomodule.c.

\>From my observation, the implementation of open() in python2/3 does
not employ the open(2) system call. However without open(2) how can
one possibly obtain a file descriptor?

There is a call to open() (the C function) in \_io\_FileIO\_\_\_init\_\_\_impl in Modules/\_io/fileio.c. I haven't traced through all the code, but I suspect builtins.open ends up calling that.

Yubin
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