-# -*-pyrex-*-
-#
-# $Id$
-#
-# File descriptor juggling
-#
-# (c) 2009 Straylight/Edgeware
-#
+### -*-pyrex-*-
+###
+### File descriptor juggling
+###
+### (c) 2009 Straylight/Edgeware
+###
-#----- Licensing notice -----------------------------------------------------
-#
-# This file is part of the Python interface to mLib.
-#
-# mLib/Python is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# mLib/Python is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with mLib/Python; if not, write to the Free Software Foundation,
-# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+###----- Licensing notice ---------------------------------------------------
+###
+### This file is part of the Python interface to mLib.
+###
+### mLib/Python is free software; you can redistribute it and/or modify
+### it under the terms of the GNU General Public License as published by
+### the Free Software Foundation; either version 2 of the License, or
+### (at your option) any later version.
+###
+### mLib/Python is distributed in the hope that it will be useful,
+### but WITHOUT ANY WARRANTY; without even the implied warranty of
+### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+### GNU General Public License for more details.
+###
+### You should have received a copy of the GNU General Public License
+### along with mLib/Python; if not, write to the Free Software Foundation,
+### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
def mdup(v):
- cdef mdup_fd *vv
+ """
+ mdup(LIST) -> LIST:
+ LIST is a list (mutable sequence) of pairs (CUR, WANT). Duplicate each
+ CUR file descriptor as WANT (may be -1 to mean `don't care'), closing
+ original CUR. Works even if there are cycles. LIST is updated in place
+ with CUR reflecting the new file descriptors even on error. Returns the
+ same LIST on success.
+ """
+ cdef mdup_fd *vv = NULL
cdef size_t n
cdef int i
cdef int rc
n = len(v)
vv = <mdup_fd *>xmalloc(n * PSIZEOF(vv))
- for 0 <= i < n:
- vv[i].cur, vv[i].want = v[i]
- rc = _mdup(vv, n)
- for 0 <= i < n:
- v[i] = vv[i].cur, vv[i].want
- if rc < 0:
- _oserror()
+ try:
+ for 0 <= i < n:
+ vv[i].cur, vv[i].want = v[i]
+ rc = _mdup(vv, n)
+ for 0 <= i < n:
+ v[i] = vv[i].cur, vv[i].want
+ if rc < 0:
+ _oserror()
+ finally:
+ xfree(vv)
return v
-#----- That's all, folks ----------------------------------------------------
+###----- That's all, folks --------------------------------------------------