osutil: consider WindowsError's behaviour to support python 2.4 on Windows This change treat the ESRCH error as ENOENT like WindowsError class does in python 2.5 or later. Without this change, some try..execpt code which expects errno is ENOENT may fail. Actually hg command does not work with python 2.4 on Windows. CreateFile() will fail with error code ESRCH when parent directory of specified path is not exist, or ENOENT when parent directory exist but file is not exist. Two errors are same in the mean of "file is not exist". So WindowsError class treats error code ESRCH as ENOENT in python 2.5 or later, but python 2.4 does not. Actual results with python 2.4: >>> errno.ENOENT 2 >>> errno.ESRCH 3 >>> WindowsError(3, 'msg').errno 3 >>> WindowsError(3, 'msg').args (3, 'msg') And with python 2.5 (or later): >>> errno.ENOENT 2 >>> errno.ESRCH 3 >>> WindowsError(3, 'msg').errno 2 >>> WindowsError(3, 'msg').args (3, 'msg') Note that there is no need to fix osutil.c because it never be used with python 2.4.