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annotate lib/write-any-file.c @ 17249:e542fd46ad6f

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maint: update all copyright year number ranges Run "make update-copyright". Compare to commit 1602f0a from last year. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 01 Jan 2013 00:50:58 +0000
parents 9009d83acea4
children
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1 /* Determine whether we can write any file.
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2
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3 Copyright (C) 2007, 2009-2013 Free Software Foundation, Inc.
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4
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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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24420da38757 * MODULES.html.sh (File system functions): New module write-any-file.
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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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24 #include "root-uid.h"
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26 #include <unistd.h>
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28 /* Return true if we know that we can write any file, including
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29 writing directories. */
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31 bool
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32 can_write_any_file (void)
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33 {
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34 static bool initialized;
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35 static bool can_write;
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37 if (! initialized)
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38 {
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39 bool can = false;
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40 #if defined PRIV_FILE_DAC_WRITE
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41 can = (priv_set_ismember (PRIV_FILE_DAC_WRITE) == 1);
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42 #else
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43 /* In traditional Unix, only root can unlink directories. */
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44 can = (geteuid () == ROOT_UID);
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45 #endif
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46 can_write = can;
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47 initialized = true;
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48 }
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50 return can_write;
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51 }