American Osteopathic Ass…tion Yearbook 2005 & 2006/American Osteopathic Association Yearbook 2005 & 2006.iso/mac/app/tempfile.pyc

Python Compiled Bytecode | 2004-07-22 | 17.1 KB | 469 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.3)

'''Temporary files.

This module provides generic, low- and high-level interfaces for
creating temporary files and directories.  The interfaces listed
as "safe" just below can be used without fear of race conditions.
Those listed as "unsafe" cannot, and are provided for backward
compatibility only.

This module also provides some data items to the user:

  TMP_MAX  - maximum number of names that will be tried before
             giving up.
  template - the default prefix for all temporary names.
             You may change this to control the default prefix.
  tempdir  - If this is set to a string before the first use of
             any routine from this module, it will be considered as
             another candidate location to store temporary files.
'''
__all__ = [
    'NamedTemporaryFile',
    'TemporaryFile',
    'mkstemp',
    'mkdtemp',
    'mktemp',
    'TMP_MAX',
    'gettempprefix',
    'tempdir',
    'gettempdir']
import os as _os
import errno as _errno
from random import Random as _Random
if _os.name == 'mac':
    import Carbon.Folder as _Folder
    import Carbon.Folders as _Folders


try:
    import fcntl as _fcntl
    _fcntl.fcntl
except (ImportError, AttributeError):

    def _set_cloexec(fd):
        pass



def _set_cloexec(fd):
    flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
    if flags >= 0:
        flags |= _fcntl.FD_CLOEXEC
        _fcntl.fcntl(fd, _fcntl.F_SETFD, flags)



try:
    import thread as _thread
except ImportError:
    import dummy_thread as _thread

_allocate_lock = _thread.allocate_lock
_text_openflags = _os.O_RDWR | _os.O_CREAT | _os.O_EXCL
if hasattr(_os, 'O_NOINHERIT'):
    _text_openflags |= _os.O_NOINHERIT

if hasattr(_os, 'O_NOFOLLOW'):
    _text_openflags |= _os.O_NOFOLLOW

_bin_openflags = _text_openflags
if hasattr(_os, 'O_BINARY'):
    _bin_openflags |= _os.O_BINARY

if hasattr(_os, 'TMP_MAX'):
    TMP_MAX = _os.TMP_MAX
else:
    TMP_MAX = 10000
template = 'tmp'
tempdir = None
_once_lock = _allocate_lock()

class _RandomNameSequence:
    '''An instance of _RandomNameSequence generates an endless
    sequence of unpredictable strings which can safely be incorporated
    into file names.  Each string is six characters long.  Multiple
    threads can safely use the same instance at the same time.

    _RandomNameSequence is an iterator.'''
    characters = 'abcdefghijklmnopqrstuvwxyz' + 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' + '0123456789-_'

    def __init__(self):
        self.mutex = _allocate_lock()
        self.rng = _Random()
        self.normcase = _os.path.normcase


    def __iter__(self):
        return self


    def next(self):
        m = self.mutex
        c = self.characters
        choose = self.rng.choice
        m.acquire()

        try:
            letters = [ choose(c) for dummy in '123456' ]
        finally:
            m.release()

        return self.normcase(''.join(letters))



def _candidate_tempdir_list():
    '''Generate a list of candidate temporary directories which
    _get_default_tempdir will try.'''
    dirlist = []
    for envname in ('TMPDIR', 'TEMP', 'TMP'):
        dirname = _os.getenv(envname)
        if dirname:
            dirlist.append(dirname)
            continue

    if _os.name == 'mac':

        try:
            fsr = _Folder.FSFindFolder(_Folders.kOnSystemDisk, _Folders.kTemporaryFolderType, 1)
            dirname = fsr.as_pathname()
            dirlist.append(dirname)
        except _Folder.error:
            pass
        except:
            None<EXCEPTION MATCH>_Folder.error


    None<EXCEPTION MATCH>_Folder.error
    if _os.name == 'riscos':
        dirname = _os.getenv('Wimp$ScrapDir')
        if dirname:
            dirlist.append(dirname)

    elif _os.name == 'nt':
        dirlist.extend([
            'c:\\temp',
            'c:\\tmp',
            '\\temp',
            '\\tmp'])
    else:
        dirlist.extend([
            '/tmp',
            '/var/tmp',
            '/usr/tmp'])

    try:
        dirlist.append(_os.getcwd())
    except (AttributeError, _os.error):
        dirlist.append(_os.curdir)

    return dirlist


def _get_default_tempdir():
    '''Calculate the default directory to use for temporary files.
    This routine should be called exactly once.

    We determine whether or not a candidate temp dir is usable by
    trying to create and write to a file in that directory.  If this
    is successful, the test file is deleted.  To prevent denial of
    service, the name of the test file must be randomized.'''
    namer = _RandomNameSequence()
    dirlist = _candidate_tempdir_list()
    flags = _text_openflags
    for dir in dirlist:
        if dir != _os.curdir:
            dir = _os.path.normcase(_os.path.abspath(dir))

        for seq in xrange(100):
            name = namer.next()
            filename = _os.path.join(dir, name)

            try:
                fd = _os.open(filename, flags, 384)
                fp = _os.fdopen(fd, 'w')
                fp.write('blat')
                fp.close()
                _os.unlink(filename)
                del fp
                del fd
                return dir
            continue
            except (OSError, IOError):
                e = None
                if e[0] != _errno.EEXIST:
                    break

                e[0] != _errno.EEXIST




    raise IOError, (_errno.ENOENT, 'No usable temporary directory found in %s' % dirlist)

_name_sequence = None

def _get_candidate_names():
    '''Common setup sequence for all user-callable interfaces.'''
    global _name_sequence
    if _name_sequence is None:
        _once_lock.acquire()

        try:
            if _name_sequence is None:
                _name_sequence = _RandomNameSequence()
        finally:
            _once_lock.release()


    return _name_sequence


def _mkstemp_inner(dir, pre, suf, flags):
    '''Code common to mkstemp, TemporaryFile, and NamedTemporaryFile.'''
    names = _get_candidate_names()
    for seq in xrange(TMP_MAX):
        name = names.next()
        file = _os.path.join(dir, pre + name + suf)

        try:
            fd = _os.open(file, flags, 384)
            _set_cloexec(fd)
            return (fd, file)
        continue
        except OSError:
            e = None
            if e.errno == _errno.EEXIST:
                continue

            raise
            continue



    raise IOError, (_errno.EEXIST, 'No usable temporary file name found')


def gettempprefix():
    '''Accessor for tempdir.template.'''
    return template

tempdir = None

def gettempdir():
    '''Accessor for tempdir.tempdir.'''
    global tempdir
    if tempdir is None:
        _once_lock.acquire()

        try:
            if tempdir is None:
                tempdir = _get_default_tempdir()
        finally:
            _once_lock.release()


    return tempdir


def mkstemp(suffix = '', prefix = template, dir = None, text = False):
    """mkstemp([suffix, [prefix, [dir, [text]]]])
    User-callable function to create and return a unique temporary
    file.  The return value is a pair (fd, name) where fd is the
    file descriptor returned by os.open, and name is the filename.

    If 'suffix' is specified, the file name will end with that suffix,
    otherwise there will be no suffix.

    If 'prefix' is specified, the file name will begin with that prefix,
    otherwise a default prefix is used.

    If 'dir' is specified, the file will be created in that directory,
    otherwise a default directory is used.

    If 'text' is specified and true, the file is opened in text
    mode.  Else (the default) the file is opened in binary mode.  On
    some operating systems, this makes no difference.

    The file is readable and writable only by the creating user ID.
    If the operating system uses permission bits to indicate whether a
    file is executable, the file is executable by no one. The file
    descriptor is not inherited by children of this process.

    Caller is responsible for deleting the file when done with it.
    """
    if dir is None:
        dir = gettempdir()

    if text:
        flags = _text_openflags
    else:
        flags = _bin_openflags
    return _mkstemp_inner(dir, prefix, suffix, flags)


def mkdtemp(suffix = '', prefix = template, dir = None):
    """mkdtemp([suffix, [prefix, [dir]]])
    User-callable function to create and return a unique temporary
    directory.  The return value is the pathname of the directory.

    Arguments are as for mkstemp, except that the 'text' argument is
    not accepted.

    The directory is readable, writable, and searchable only by the
    creating user.

    Caller is responsible for deleting the directory when done with it.
    """
    if dir is None:
        dir = gettempdir()

    names = _get_candidate_names()
    for seq in xrange(TMP_MAX):
        name = names.next()
        file = _os.path.join(dir, prefix + name + suffix)

        try:
            _os.mkdir(file, 448)
            return file
        continue
        except OSError:
            e = None
            if e.errno == _errno.EEXIST:
                continue

            raise
            continue



    raise IOError, (_errno.EEXIST, 'No usable temporary directory name found')


def mktemp(suffix = '', prefix = template, dir = None):
    """mktemp([suffix, [prefix, [dir]]])
    User-callable function to return a unique temporary file name.  The
    file is not created.

    Arguments are as for mkstemp, except that the 'text' argument is
    not accepted.

    This function is unsafe and should not be used.  The file name
    refers to a file that did not exist at some point, but by the time
    you get around to creating it, someone else may have beaten you to
    the punch.
    """
    if dir is None:
        dir = gettempdir()

    names = _get_candidate_names()
    for seq in xrange(TMP_MAX):
        name = names.next()
        file = _os.path.join(dir, prefix + name + suffix)
        if not _os.path.exists(file):
            return file
            continue

    raise IOError, (_errno.EEXIST, 'No usable temporary filename found')


class _TemporaryFileWrapper:
    '''Temporary file wrapper

    This class provides a wrapper around files opened for
    temporary use.  In particular, it seeks to automatically
    remove the file when it is no longer needed.
    '''

    def __init__(self, file, name):
        self.file = file
        self.name = name
        self.close_called = False


    def __getattr__(self, name):
        file = self.__dict__['file']
        a = getattr(file, name)
        if type(a) != type(0):
            setattr(self, name, a)

        return a

    if _os.name != 'nt':
        unlink = _os.unlink

        def close(self):
            if not (self.close_called):
                self.close_called = True
                self.file.close()
                self.unlink(self.name)



        def __del__(self):
            self.close()




def NamedTemporaryFile(mode = 'w+b', bufsize = -1, suffix = '', prefix = template, dir = None):
    '''Create and return a temporary file.
    Arguments:
    \'prefix\', \'suffix\', \'dir\' -- as for mkstemp.
    \'mode\' -- the mode argument to os.fdopen (default "w+b").
    \'bufsize\' -- the buffer size argument to os.fdopen (default -1).
    The file is created as mkstemp() would do it.

    Returns a file object; the name of the file is accessible as
    file.name.  The file will be automatically deleted when it is
    closed.
    '''
    if dir is None:
        dir = gettempdir()

    if 'b' in mode:
        flags = _bin_openflags
    else:
        flags = _text_openflags
    if _os.name == 'nt':
        flags |= _os.O_TEMPORARY

    (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
    file = _os.fdopen(fd, mode, bufsize)
    return _TemporaryFileWrapper(file, name)

if _os.name != 'posix' or _os.sys.platform == 'cygwin':
    TemporaryFile = NamedTemporaryFile
else:

    def TemporaryFile(mode = 'w+b', bufsize = -1, suffix = '', prefix = template, dir = None):
        '''Create and return a temporary file.
        Arguments:
        \'prefix\', \'suffix\', \'directory\' -- as for mkstemp.
        \'mode\' -- the mode argument to os.fdopen (default "w+b").
        \'bufsize\' -- the buffer size argument to os.fdopen (default -1).
        The file is created as mkstemp() would do it.

        Returns a file object.  The file has no name, and will cease to
        exist when it is closed.
        '''
        if dir is None:
            dir = gettempdir()

        if 'b' in mode:
            flags = _bin_openflags
        else:
            flags = _text_openflags
        (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)

        try:
            _os.unlink(name)
            return _os.fdopen(fd, mode, bufsize)
        except:
            _os.close(fd)
            raise