On Tue, Apr 7, 2015 at 3:48 PM, Cameron Simpson <c...@zip.com.au> wrote: > The operating system arranges the commection of the shell to the terminal. > Your usual program has by default a stdin, stdout and stderr. These are > _all_ the same file handle, duplicated to each of the three file descriptors > 0, 1 and 2 respectively. On the operating system side, the OS has performed > _one_ open() call on the terminal device and handed the caller a single file > descriptor. The caller then calls dup() (or modernly, dup2()) to present the > open terminal as stdin, stdout and stderr.
Really? I can believe that stdout and stderr are initially duplicates, but stdin as well? Isn't stdin opened for reading only, and stdout/stderr for writing only? I grew up on DOS and OS/2, not on Unix, so maybe there's a massive simplification here that I'm not aware of. That'd be pretty clean and tidy if what you say is the case! ChrisA -- https://mail.python.org/mailman/listinfo/python-list
