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emmanuel,
Regarding your points: All three can be taken care of with a combination of my patch and setting sys.stdin, sys.stdout, and sys.stderr to the pty. (That should really be done internally with another patch, since os.fdopen is OS-specific. Also, sys.stdin, sys.stdout, and sys.stderr should each have distinct underlying file descriptors, which I didn't do in working.c.) Those can safely be replaced since they're just the "effective" standard files, and sys.__stdin__ et al. refer to the actual C stdin et al. The remaining issue would be that the same descriptor shouldn't be used for both input and output in the interpreter loop, especially if the FILE* passed is only open for reading (since standard input technically doesn't have to be writable.)
Kevin Barry