Lars Kotthoff wrote:
This prints out "foo" twice although it's only written once to the pipe. It seems that python doesn't flush file descriptors before copying them to the child process, thus resulting in the duplicate message. The equivalent C program behaves as expected,
Your Python and C programs are not equivalent -- the C one is writing directly to the file descriptor, whereas the Python one is effectively using a buffered stdio stream. The unflushed stdio buffer is getting copied by the fork, hence the duplicate output. Solution: either (a) flush the Python file object before forking or (b) use os.write() directly on the fd to avoid the buffering. -- Greg _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
