New submission from Charles-François Natali <neolo...@free.fr>: After a call to fdlistdir(), another call to fdlistdir() on the same file handle (but using a different FD, since the FD passed to fdlistdir() is closed) will return an empty list:
""" $ cat ~/test_fdlistdir.py import os import sys fd = os.open(sys.argv[1], os.O_RDONLY) print(os.fdlistdir(os.dup(fd))) print(os.fdlistdir(os.dup(fd))) os.close(fd) $ ./python ~/test_fdlistdir.py /tmp/ ['pulse-B1FebW397VI5', 'ksocket-kdm', 'etc', 'kde-cf', 'ksocket-cf', 'test_posix.py', '.X0-lock', 'kde-kdm', 'akonadi-cf.k6y52j', 'ssh-iSFleEAS1243', '.ICE-unix', '.X11-unix'] [] """ That's because fdopendir()/readdir doesn't reset the FD offset. It's documented by POSIX: """ The file offset associated with the file descriptor at the time of the call determines which entries are returned. """ That's rather suprising (I got bitten while trying to write a test for #13734). I see two options: 1. rewind the directory stream in fdlistdir() 2. document this Here's a patch for option 1. ---------- components: None files: fdlistdir.diff keywords: patch messages: 150877 nosy: neologix, pitrou, rosslagerwall priority: normal severity: normal status: open title: os.fdlistdir() is not idempotent type: behavior versions: Python 3.3 Added file: http://bugs.python.org/file24178/fdlistdir.diff _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue13739> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
