mdw@git.distorted.org.uk Git - mLib-python/blob - sel-file.pyx

   1 ### -*-pyrex-*-
   2 ###
   3 ### File selectors
   4 ###
   5 ### (c) 2005 Straylight/Edgeware
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the Python interface to mLib.
  11 ###
  12 ### mLib/Python is free software; you can redistribute it and/or modify
  13 ### it under the terms of the GNU General Public License as published by
  14 ### the Free Software Foundation; either version 2 of the License, or
  15 ### (at your option) any later version.
  16 ###
  17 ### mLib/Python is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ### GNU General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with mLib/Python; if not, write to the Free Software Foundation,
  24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 SEL_READ = _SEL_READ
  27 SEL_WRITE = _SEL_WRITE
  28 SEL_EXCEPT = _SEL_EXC
  29
  30 cdef class SelFile:
  31   """
  32   SelFile(FILE, [mode = SEL_READ], [readyproc = None])
  33
  34   Register a file (or socket, or, ...) with the select loop.
  35   """
  36   cdef sel_file f
  37   cdef int _activep
  38   cdef readonly unsigned mode
  39   cdef _readyfunc
  40   def __cinit__(me, fd, int mode = SEL_READ, readyproc = None,
  41               *hunoz, **hukairz):
  42     if (mode != _SEL_READ and
  43         mode != _SEL_WRITE and
  44         mode != _SEL_EXC):
  45       raise ValueError, 'bad select mode'
  46     sel_initfile(&_sel, &me.f, _getfd(fd), mode, _filefunc, <void *>me)
  47     me._activep = 0
  48     me.mode = mode
  49     me._readyfunc = _checkcallable(readyproc, 'ready proc')
  50   def __dealloc__(me):
  51     if me._activep:
  52       sel_rmfile(&me.f)
  53   property fd:
  54     """SF.fd -> INT: the file descriptor"""
  55     def __get__(me):
  56       return me.f.fd
  57   property activep:
  58     """SF.activep -> BOOL: is the descriptor active?"""
  59     def __get__(me):
  60       return _tobool(me._activep)
  61   property readyproc:
  62     """SF.readyproc -> FUNC: call FUNC() when file is ready for I/O"""
  63     def __get__(me):
  64       return me._readyfunc
  65     def __set__(me, proc):
  66       me._readyfunc = _checkcallable(proc, 'ready proc')
  67     def __del__(me):
  68       me._readyfunc = None
  69   def enable(me):
  70     """SF.enable(): enable waiting on file"""
  71     if me._activep:
  72       raise ValueError, 'already enabled'
  73     sel_addfile(&me.f)
  74     me._enabled()
  75     return me
  76   def disable(me):
  77     """SF.disable(): disable waiting on file"""
  78     if not me._activep:
  79       raise ValueError, 'already disabled'
  80     sel_rmfile(&me.f)
  81     me._disabled()
  82     return me
  83   def force(me):
  84     """SF.force(): artificially mark file as ready"""
  85     sel_force(&me.f)
  86     return me
  87   cdef _enabled(me):
  88     me._activep = 1
  89     me.enabled()
  90   cdef _disabled(me):
  91     me._activep = 0
  92     me.disabled()
  93   def enabled(me):
  94     """SF.enabled(): called when file is enabled"""
  95     pass
  96   def disabled(me):
  97     """SF.disabled(): called when file is disabled"""
  98     pass
  99   def ready(me):
 100     """SF.ready(): called when file is ready for I/O"""
 101     return _maybecall(me._readyfunc, ())
 102
 103 cdef void _filefunc(int fd, unsigned mode, void *arg):
 104   cdef SelFile sf
 105   sf = <SelFile>arg
 106   sf.ready()
 107
 108 ###----- That's all, folks --------------------------------------------------