Mercurial > hg > octave-kai > gnulib-hg
annotate lib/dup-safer.c @ 5132:c7c53476ce34
(errno): Don't declare; we assume C89 or better now.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 06 Aug 2004 05:16:49 +0000 |
| parents | 45ae29380da9 |
| children | 6962b5c5069f |
| rev | line source |
|---|---|
| 3196 | 1 /* Invoke dup, but avoid some glitches. |
|
5132
c7c53476ce34
(errno): Don't declare; we assume C89 or better now.
Paul Eggert <eggert@cs.ucla.edu>
parents:
3196
diff
changeset
|
2 Copyright (C) 2001, 2004 Free Software Foundation, Inc. |
| 3196 | 3 |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program; if not, write to the Free Software Foundation, | |
| 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
| 17 | |
| 18 /* Written by Paul Eggert. */ | |
| 19 | |
| 20 #if HAVE_CONFIG_H | |
| 21 # include <config.h> | |
| 22 #endif | |
| 23 | |
| 24 #include <errno.h> | |
| 25 | |
| 26 #if HAVE_FCNTL_H | |
| 27 # include <fcntl.h> | |
| 28 #endif | |
| 29 | |
| 30 #if HAVE_UNISTD_H | |
| 31 # include <unistd.h> | |
| 32 #endif | |
| 33 #ifndef STDERR_FILENO | |
| 34 # define STDERR_FILENO 2 | |
| 35 #endif | |
| 36 | |
| 37 #include <unistd-safer.h> | |
| 38 | |
| 39 /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or | |
| 40 STDERR_FILENO. */ | |
| 41 | |
| 42 int | |
| 43 dup_safer (int fd) | |
| 44 { | |
| 45 #ifdef F_DUPFD | |
| 46 return fcntl (fd, F_DUPFD, STDERR_FILENO + 1); | |
| 47 #else | |
| 48 int f = dup (fd); | |
| 49 if (0 <= f && f <= STDERR_FILENO) | |
| 50 { | |
| 51 int f1 = dup_safer (f); | |
| 52 int e = errno; | |
| 53 close (f); | |
| 54 errno = e; | |
| 55 f = f1; | |
| 56 } | |
| 57 return f; | |
| 58 #endif | |
| 59 } |