def emit(self, record):
"""
Emit a record.
First check if the underlying file has changed, and if it
has, close the old stream and reopen the file to get the
current stream.
"""
# Reduce the chance of race conditions by stat'ing by path only
# once and then fstat'ing our new fd if we opened a new log stream.
# See issue #14632: Thanks to John Mulligan for the problem report
# and patch.
try:
# stat the file by path, checking for existence
sres = os.stat(self.baseFilename)
except OSError as e:
if e.errno == errno.ENOENT:
sres = None
else:
raise
# compare file system stat with that of our stream file handle
if not sres or sres[ST_DEV] != self.dev or sres[ST_INO] != self.ino:
# Fixed by xp 2017 Apr 03:
# os.fstat still gets OSError(errno=2), although it operates
# directly on fd instead of path. The same for stream.flush().
# Thus we keep on trying this close/open/stat loop until no
# OSError raises.
for ii in range(16):
try:
if self.stream is not None:
# we have an open file handle, clean it up
self.stream.flush()
self.stream.close()
# See Issue #21742: _open () might fail.
self.stream = None
# open a new file handle and get new stat info from
# that fd
self.stream = self._open()
self._statstream()
break
except OSError as e:
if e.errno == errno.ENOENT:
continue
else:
raise
logging.FileHandler.emit(self, record)
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