This file is indexed.

/usr/share/pyshared/eventlet/greenio.py is in python-eventlet 0.9.16-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
from eventlet.support import get_errno
from eventlet.hubs import trampoline
BUFFER_SIZE = 4096

import errno
import os
import socket
from socket import socket as _original_socket
import sys
import time
import warnings

__all__ = ['GreenSocket', 'GreenPipe', 'shutdown_safe']

CONNECT_ERR = set((errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK))
CONNECT_SUCCESS = set((0, errno.EISCONN))
if sys.platform[:3]=="win":
    CONNECT_ERR.add(errno.WSAEINVAL)   # Bug 67

# Emulate _fileobject class in 3.x implementation
# Eventually this internal socket structure could be replaced with makefile calls.
try:
    _fileobject = socket._fileobject
except AttributeError:
   def _fileobject(sock, *args, **kwargs):
        return _original_socket.makefile(sock, *args, **kwargs)

def socket_connect(descriptor, address):
    """
    Attempts to connect to the address, returns the descriptor if it succeeds,
    returns None if it needs to trampoline, and raises any exceptions.
    """
    err = descriptor.connect_ex(address)
    if err in CONNECT_ERR:
        return None
    if err not in CONNECT_SUCCESS:
        raise socket.error(err, errno.errorcode[err])
    return descriptor

def socket_checkerr(descriptor):
    err = descriptor.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
    if err not in CONNECT_SUCCESS:
        raise socket.error(err, errno.errorcode[err])

def socket_accept(descriptor):
    """
    Attempts to accept() on the descriptor, returns a client,address tuple
    if it succeeds; returns None if it needs to trampoline, and raises
    any exceptions.
    """
    try:
        return descriptor.accept()
    except socket.error, e:
        if get_errno(e) == errno.EWOULDBLOCK:
            return None
        raise


if sys.platform[:3]=="win":
    # winsock sometimes throws ENOTCONN
    SOCKET_BLOCKING = set((errno.EWOULDBLOCK,))
    SOCKET_CLOSED = set((errno.ECONNRESET, errno.ENOTCONN, errno.ESHUTDOWN))
else:
    # oddly, on linux/darwin, an unconnected socket is expected to block,
    # so we treat ENOTCONN the same as EWOULDBLOCK
    SOCKET_BLOCKING = set((errno.EWOULDBLOCK, errno.ENOTCONN))
    SOCKET_CLOSED = set((errno.ECONNRESET, errno.ESHUTDOWN, errno.EPIPE))


def set_nonblocking(fd):
    """
    Sets the descriptor to be nonblocking.  Works on many file-like
    objects as well as sockets.  Only sockets can be nonblocking on
    Windows, however.
    """
    try:
        setblocking = fd.setblocking
    except AttributeError:
        # fd has no setblocking() method. It could be that this version of
        # Python predates socket.setblocking(). In that case, we can still set
        # the flag "by hand" on the underlying OS fileno using the fcntl
        # module.
        try:
            import fcntl
        except ImportError:
            # Whoops, Windows has no fcntl module. This might not be a socket
            # at all, but rather a file-like object with no setblocking()
            # method. In particular, on Windows, pipes don't support
            # non-blocking I/O and therefore don't have that method. Which
            # means fcntl wouldn't help even if we could load it.
            raise NotImplementedError("set_nonblocking() on a file object "
                                      "with no setblocking() method "
                                      "(Windows pipes don't support non-blocking I/O)")
        # We managed to import fcntl.
        fileno = fd.fileno()
        flags = fcntl.fcntl(fileno, fcntl.F_GETFL)
        fcntl.fcntl(fileno, fcntl.F_SETFL, flags | os.O_NONBLOCK)
    else:
        # socket supports setblocking()
        setblocking(0)


try:
    from socket import _GLOBAL_DEFAULT_TIMEOUT
except ImportError:
    _GLOBAL_DEFAULT_TIMEOUT = object()


class GreenSocket(object):
    """
    Green version of socket.socket class, that is intended to be 100%
    API-compatible.
    """
    def __init__(self, family_or_realsock=socket.AF_INET, *args, **kwargs):
        if isinstance(family_or_realsock, (int, long)):
            fd = _original_socket(family_or_realsock, *args, **kwargs)
        else:
            fd = family_or_realsock
            assert not args, args
            assert not kwargs, kwargs

        # import timeout from other socket, if it was there
        try:
            self._timeout = fd.gettimeout() or socket.getdefaulttimeout()
        except AttributeError:
            self._timeout = socket.getdefaulttimeout()
        
        set_nonblocking(fd)
        self.fd = fd
        # when client calls setblocking(0) or settimeout(0) the socket must
        # act non-blocking
        self.act_non_blocking = False

    @property
    def _sock(self):
        return self

    #forward unknown attibutes to fd
    # cache the value for future use.
    # I do not see any simple attribute which could be changed
    # so caching everything in self is fine,
    # If we find such attributes - only attributes having __get__ might be cahed.
    # For now - I do not want to complicate it.
    def __getattr__(self, name):
        attr = getattr(self.fd, name)
        setattr(self, name, attr)
        return attr

    def accept(self):
        if self.act_non_blocking:
            return self.fd.accept()
        fd = self.fd
        while True:
            res = socket_accept(fd)
            if res is not None:
                client, addr = res
                set_nonblocking(client)
                return type(self)(client), addr
            trampoline(fd, read=True, timeout=self.gettimeout(),
                           timeout_exc=socket.timeout("timed out"))

    def connect(self, address):
        if self.act_non_blocking:
            return self.fd.connect(address)
        fd = self.fd
        if self.gettimeout() is None:
            while not socket_connect(fd, address):
                trampoline(fd, write=True)
                socket_checkerr(fd)
        else:
            end = time.time() + self.gettimeout()
            while True:
                if socket_connect(fd, address):
                    return
                if time.time() >= end:
                    raise socket.timeout("timed out")
                try:
                    trampoline(fd, write=True, timeout=end-time.time(),
                            timeout_exc=socket.timeout("timed out"))
                except socket.timeout, e:
                    try:
                        if socket_connect(fd, address):
                            return
                        raise e
                    except:
                        raise e
                socket_checkerr(fd)

    def connect_ex(self, address):
        if self.act_non_blocking:
            return self.fd.connect_ex(address)
        fd = self.fd
        if self.gettimeout() is None:
            while not socket_connect(fd, address):
                try:
                    trampoline(fd, write=True)
                    socket_checkerr(fd)
                except socket.error, ex:
                    return get_errno(ex)
        else:
            end = time.time() + self.gettimeout()
            while True:
                try:
                    if socket_connect(fd, address):
                        return 0
                    if time.time() >= end:
                        raise socket.timeout(errno.EAGAIN)
                    try:
                        trampoline(fd, write=True, timeout=end-time.time(),
                                timeout_exc=socket.timeout(errno.EAGAIN))
                    except socket.timeout, e:
                        try:
                            if socket_connect(fd, address):
                                return
                            raise e
                        except:
                            raise e
                    socket_checkerr(fd)
                except socket.error, ex:
                    return get_errno(ex)

    def dup(self, *args, **kw):
        sock = self.fd.dup(*args, **kw)
        set_nonblocking(sock)
        newsock = type(self)(sock)
        newsock.settimeout(self.gettimeout())
        return newsock

    def makefile(self, *args, **kw):
        return _fileobject(self.dup(), *args, **kw)

    def makeGreenFile(self, *args, **kw):
        warnings.warn("makeGreenFile has been deprecated, please use "
            "makefile instead", DeprecationWarning, stacklevel=2)
        return self.makefile(*args, **kw)

    def _read_io(self, fd, f, *args, **kwargs):
        if self.act_non_blocking:
            return f(*args, **kwargs)
        while True:
            try:
                return f(*args, **kwargs)
            except socket.error, e:
                if get_errno(e) in SOCKET_BLOCKING:
                    pass
                # XXX -- Why does recv() do this?
                elif f == fd.recv and get_errno(e) in SOCKET_CLOSED:
                    return ''
                else:
                    raise
            try:
                trampoline(fd, 
                        read=True, 
                        timeout=self.gettimeout(), 
                        timeout_exc=socket.timeout("timed out"))
            except socket.timeout, e:
                # Try one last time to see if the timeout is 'real'
                try:
                    return f(*args, **kwargs)
                except:
                    raise e

    def recv(self, buflen, flags=0):
        return self._read_io(self.fd, self.fd.recv, buflen, flags)

    def recvfrom(self, *args):
        return self._read_io(self.fd, self.fd.recvfrom, *args)

    def recvfrom_into(self, *args):
        return self._read_io(self.fd, self.fd.recvfrom_into, *args)

    def recv_into(self, *args):
        return self._read_io(self.fd, self.fd.recv_into, *args)

    def send(self, data, flags=0):
        fd = self.fd
        if self.act_non_blocking:
            return fd.send(data, flags)

        # blocking socket behavior - sends all, blocks if the buffer is full
        total_sent = 0
        len_data = len(data)

        while True:
            try:
                total_sent += fd.send(data[total_sent:], flags)
            except socket.error, e:
                if get_errno(e) not in SOCKET_BLOCKING:
                    raise

            if total_sent == len_data:
                break

            try:
                trampoline(fd, write=True, timeout=self.gettimeout(),
                        timeout_exc=socket.timeout("timed out"))
            except socket.timeout, e:
                # Try one last time to see if the timeout is 'real'
                try:
                    total_sent += fd.send(data[total_sent:], flags)
                except:
                    raise e

        return total_sent

    def sendall(self, data, flags=0):
        tail = self.send(data, flags)
        len_data = len(data)
        while tail < len_data:
            tail += self.send(data[tail:], flags)

    def sendto(self, *args):
        fd = self.fd
        if self.act_non_blocking:
            return fd.sendto(*args)
        while True:
            try:
                return fd.sendto(*args)
            except socket.error, e:
                if get_errno(e) in SOCKET_BLOCKING:
                    pass
                else:
                    raise
            try:
                trampoline(fd, write=True, timeout=self.gettimeout(),
                        timeout_exc=socket.timeout("timed out"))
            except socket.timeout, e:
                # Try one last time to see if the timeout is 'real'
                try:
                    return fd.sendto(*args)
                except:
                    raise e

    def setblocking(self, flag):
        if flag:
            self.act_non_blocking = False
            self._timeout = None
        else:
            self.act_non_blocking = True
            self._timeout = 0.0

    def settimeout(self, howlong):
        if howlong is None or howlong == _GLOBAL_DEFAULT_TIMEOUT:
            self.setblocking(True)
            return
        try:
            f = howlong.__float__
        except AttributeError:
            raise TypeError('a float is required')
        howlong = f()
        if howlong < 0.0:
            raise ValueError('Timeout value out of range')
        if howlong == 0.0:
            self.setblocking(howlong)
        else:
            self._timeout = howlong

    def gettimeout(self):
        return self._timeout

class _SocketDuckForFd(object):
    """ Class implementing all socket method used by _fileobject in cooperative manner using low level os I/O calls."""
    def __init__(self, fileno):
        self._fileno = fileno

    @property
    def _sock(self):
        return self

    def fileno(self):
        return self._fileno

    def recv(self, buflen):
        while True:
            try:
                data = os.read(self._fileno, buflen)
                return data
            except OSError, e:
                if get_errno(e) != errno.EAGAIN:
                    raise IOError(*e.args)
            trampoline(self, read=True)

    def sendall(self, data):
        len_data = len(data)
        os_write = os.write
        fileno = self._fileno
        try:
            total_sent = os_write(fileno, data)
        except OSError, e:
            if get_errno(e) != errno.EAGAIN:
                raise IOError(*e.args)
            total_sent = 0
        while total_sent <len_data:
            trampoline(self, write=True)
            try:
                total_sent += os_write(fileno, data[total_sent:])
            except OSError, e:
                if get_errno(e) != errno. EAGAIN:
                    raise IOError(*e.args)

    def __del__(self):
        try:
            os.close(self._fileno)
        except:
            # os.close may fail if __init__ didn't complete (i.e file dscriptor passed to popen was invalid
            pass

    def __repr__(self):  
        return "%s:%d" % (self.__class__.__name__, self._fileno)

def _operationOnClosedFile(*args, **kwargs):
    raise ValueError("I/O operation on closed file")

class GreenPipe(_fileobject):
    """
    GreenPipe is a cooperative replacement for file class.
    It will cooperate on pipes. It will block on regular file.
    Differneces from file class:
    - mode is r/w property. Should re r/o
    - encoding property not implemented
    - write/writelines will not raise TypeError exception when non-string data is written
      it will write str(data) instead
    - Universal new lines are not supported and newlines property not implementeded
    - file argument can be descriptor, file name or file object.
    """
    def __init__(self, f, mode='r', bufsize=-1):
        if not isinstance(f, (basestring, int, file)):
            raise TypeError('f(ile) should be int, str, unicode or file, not %r' % f)

        if isinstance(f, basestring):
            f = open(f, mode, 0)
 
        if isinstance(f, int):
            fileno = f
            self._name = "<fd:%d>" % fileno
        else:
            fileno = os.dup(f.fileno())
            self._name = f.name
            if f.mode != mode:
                raise ValueError('file.mode %r does not match mode parameter %r' % (f.mode, mode))
            self._name = f.name
            f.close()

        super(GreenPipe, self).__init__(_SocketDuckForFd(fileno), mode, bufsize)
        set_nonblocking(self)
        self.softspace = 0

    @property
    def name(self): return self._name

    def __repr__(self):
        return "<%s %s %r, mode %r at 0x%x>" % (
            self.closed and 'closed' or 'open',
            self.__class__.__name__,
            self.name,
            self.mode,
            (id(self) < 0) and (sys.maxint +id(self)) or id(self))

    def close(self):
        super(GreenPipe, self).close()
        for method in ['fileno', 'flush', 'isatty', 'next', 'read', 'readinto',
                   'readline', 'readlines', 'seek', 'tell', 'truncate',
                   'write', 'xreadlines', '__iter__', 'writelines']:
            setattr(self, method, _operationOnClosedFile)

    if getattr(file, '__enter__', None):
        def __enter__(self):
            return self

        def __exit__(self, *args):
            self.close()

    def xreadlines(self, buffer):
        return iterator(self)

    def readinto(self, buf):
        data = self.read(len(buf)) #FIXME could it be done without allocating intermediate?
        n = len(data)
        try:
            buf[:n] = data
        except TypeError, err:
            if not isinstance(buf, array.array):
                raise err
            buf[:n] = array.array('c', data)
        return n

    def _get_readahead_len(self):
        try:
            return len(self._rbuf.getvalue()) # StringIO in 2.5
        except AttributeError:
            return len(self._rbuf) # str in 2.4

    def _clear_readahead_buf(self):
        len = self._get_readahead_len()
        if len>0:
            self.read(len)

    def tell(self):
        self.flush()
        try:
            return os.lseek(self.fileno(), 0, 1) - self._get_readahead_len()
        except OSError, e:
            raise IOError(*e.args)

    def seek(self, offset, whence=0):
        self.flush()
        if whence == 1 and offset==0: # tell synonym
            return self.tell()
        if whence == 1: # adjust offset by what is read ahead
            offset -= self.get_readahead_len()
        try:
            rv = os.lseek(self.fileno(), offset, whence)
        except OSError, e:
            raise IOError(*e.args)
        else:
            self._clear_readahead_buf()
            return rv

    if getattr(file, "truncate", None): # not all OSes implement truncate
        def truncate(self, size=-1):
            self.flush()
            if size ==-1:
                size = self.tell()
            try:
                rv = os.ftruncate(self.fileno(), size)
            except OSError, e:
                raise IOError(*e.args)
            else:
                self.seek(size) # move position&clear buffer
                return rv

    def isatty(self):
        try:
            return os.isatty(self.fileno())
        except OSError, e:
            raise IOError(*e.args)


# import SSL module here so we can refer to greenio.SSL.exceptionclass
try:
    from OpenSSL import SSL
except ImportError:
    # pyOpenSSL not installed, define exceptions anyway for convenience
    class SSL(object):
        class WantWriteError(object):
            pass

        class WantReadError(object):
            pass

        class ZeroReturnError(object):
            pass

        class SysCallError(object):
            pass


def shutdown_safe(sock):
    """ Shuts down the socket. This is a convenience method for
    code that wants to gracefully handle regular sockets, SSL.Connection
    sockets from PyOpenSSL and ssl.SSLSocket objects from Python 2.6
    interchangeably.  Both types of ssl socket require a shutdown() before
    close, but they have different arity on their shutdown method.

    Regular sockets don't need a shutdown before close, but it doesn't hurt.
    """
    try:
        try:
            # socket, ssl.SSLSocket
            return sock.shutdown(socket.SHUT_RDWR)
        except TypeError:
            # SSL.Connection
            return sock.shutdown()
    except socket.error, e:
        # we don't care if the socket is already closed;
        # this will often be the case in an http server context
        if get_errno(e) != errno.ENOTCONN:
            raise