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annotate lib/write-any-file.c @ 16201:8250f2777afc

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maint: update all copyright year number ranges Run "make update-copyright".
author Jim Meyering <meyering@redhat.com>
date Sun, 01 Jan 2012 10:04:58 +0100
parents 97fc9a21a8fb
children 9009d83acea4
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1 /* Determine whether we can write any file.
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3 Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18 /* Written by Paul Eggert. */
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20 #include <config.h>
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22 #include "write-any-file.h"
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23 #include "priv-set.h"
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25 #include <unistd.h>
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27 /* Return true if we know that we can write any file, including
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28 writing directories. */
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30 bool
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31 can_write_any_file (void)
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32 {
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33 static bool initialized;
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34 static bool can_write;
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36 if (! initialized)
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37 {
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38 bool can = false;
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39 #if defined PRIV_FILE_DAC_WRITE
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40 can = (priv_set_ismember (PRIV_FILE_DAC_WRITE) == 1);
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41 #else
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42 /* In traditional Unix, only root can unlink directories. */
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43 can = (geteuid () == 0);
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44 #endif
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45 can_write = can;
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46 initialized = true;
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47 }
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49 return can_write;
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50 }