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3196
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1 /* Invoke dup, but avoid some glitches. |
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2 Copyright (C) 2001 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software Foundation, |
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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17 |
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18 /* Written by Paul Eggert. */ |
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19 |
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20 #if HAVE_CONFIG_H |
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21 # include <config.h> |
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22 #endif |
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23 |
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24 #include <errno.h> |
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25 #ifndef errno |
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26 extern int errno; |
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27 #endif |
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28 |
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29 #if HAVE_FCNTL_H |
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30 # include <fcntl.h> |
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31 #endif |
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32 |
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33 #if HAVE_UNISTD_H |
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34 # include <unistd.h> |
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35 #endif |
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36 #ifndef STDERR_FILENO |
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37 # define STDERR_FILENO 2 |
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38 #endif |
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39 |
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40 #include <unistd-safer.h> |
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41 |
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42 /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or |
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43 STDERR_FILENO. */ |
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44 |
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45 int |
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46 dup_safer (int fd) |
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47 { |
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48 #ifdef F_DUPFD |
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49 return fcntl (fd, F_DUPFD, STDERR_FILENO + 1); |
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50 #else |
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51 int f = dup (fd); |
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52 if (0 <= f && f <= STDERR_FILENO) |
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53 { |
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54 int f1 = dup_safer (f); |
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55 int e = errno; |
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56 close (f); |
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57 errno = e; |
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58 f = f1; |
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59 } |
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60 return f; |
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61 #endif |
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62 } |
