The shell code now uses the dup2 command of the Python os module, which interacts with the operating system. The following command takes the file descriptor generated by the previous socket command, and duplicates it three times, overwriting the data streams stdin, stdout, and stderr with the ...
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os.dup2() now returns the new file descriptor. Previously, None was always returned. (Contributed by Benjamin Peterson in bpo-32441.) The structure returned by os.stat() now contains the st_fstype attribute on Solaris and its derivatives. (Contributed by Jesús Cea Avión in bpo-32659.) ...
Keep in mind thatmany file descriptors can point to a single file description. This is for instance when a file descriptor is duplicated usingdup(2)syscall. The duplicated file descriptor refers to the same open file description. As a consequence, both file descriptors will share the file's ...