~mdw / mLib-python / blame
| Commit | Line | Data |
|---|---|---|
| 5b1830f3 MW |
1 | ### -*-pyrex-*- |
| 2 | ### | |
| 3 | ### File descriptor juggling | |
| 4 | ### | |
| 5 | ### (c) 2009 Straylight/Edgeware | |
| 6 | ### | |
| ea2fc600 | 7 | |
| 5b1830f3 MW |
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. | |
| ea2fc600 MW |
25 | |
| 26 | def mdup(v): | |
| addc0c37 MW |
27 | """ |
| 28 | mdup(LIST) -> LIST: | |
| 29 | LIST is a list (mutable sequence) of pairs (CUR, WANT). Duplicate each | |
| 30 | CUR file descriptor as WANT (may be -1 to mean `don't care'), closing | |
| 31 | original CUR. Works even if there are cycles. LIST is updated in place | |
| 32 | with CUR reflecting the new file descriptors even on error. Returns the | |
| 33 | same LIST on success. | |
| 34 | """ | |
| ea2fc600 MW |
35 | cdef mdup_fd *vv |
| 36 | cdef size_t n | |
| 37 | cdef int i | |
| 38 | cdef int rc | |
| 39 | ||
| 40 | n = len(v) | |
| 41 | vv = <mdup_fd *>xmalloc(n * PSIZEOF(vv)) | |
| 42 | for 0 <= i < n: | |
| 43 | vv[i].cur, vv[i].want = v[i] | |
| 44 | rc = _mdup(vv, n) | |
| 45 | for 0 <= i < n: | |
| 46 | v[i] = vv[i].cur, vv[i].want | |
| 47 | if rc < 0: | |
| 48 | _oserror() | |
| 49 | return v | |
| 50 | ||
| 5b1830f3 | 51 | ###----- That's all, folks -------------------------------------------------- |