New submission from Dima Tisnek:
os.fdopen() should either:
* consume file descriptor and return file/io object, or
* leave file descriptor alone and raise an exception
this invariant is broken in the following test case:
fd = os.open("/", os.O_RDONLY)
try:
obj = os.fdopen(fd, "r")
except EnvironmentError:
os.close(fd) # cleanup
what happens:
fd = os.open("/", os.O_RDONLY) --> some fd
os.fdopen(fd, "r") --> exception, fd refers to a directory
os.close(fd) --> exception, no such fd
For reference:
1. invariant is held in Python 3.3.
2. following positive test case works correctly
fd = os.open("/etc/passwd", os.O_RDONLY)
try: obj = os.fdopen(fd, "r") # success
except EnvironmentError: os.close(fd) # not reached
3. following negative test case works correctly
fd = os.open("/etc/passwd", os.O_RDONLY)
try: obj = os.fdopen(fd, "w") # wrong mode on purpose
except EnvironmentError: os.close(fd) # closed ok
----------
components: IO
messages: 215832
nosy: Dima.Tisnek
priority: normal
severity: normal
status: open
title: os.fdopen() may eat file descriptor and still raise exception
type: resource usage
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21191>
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