56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
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/* unlinkdir.c - determine whether we can unlink directories
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Copyright (C) 2005-2006, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert, Jim Meyering, and David Bartley. */
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#include <config.h>
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#include "unlinkdir.h"
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#include "priv-set.h"
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#include "root-uid.h"
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#include <unistd.h>
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#if ! UNLINK_CANNOT_UNLINK_DIR
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/* Return true if we cannot unlink directories, false if we might be
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able to unlink directories. */
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bool
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cannot_unlink_dir (void)
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{
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static bool initialized;
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static bool cannot;
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if (! initialized)
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{
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# if defined PRIV_SYS_LINKDIR
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/* We might be able to unlink directories if we cannot
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determine our privileges, or if we have the
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PRIV_SYS_LINKDIR privilege. */
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cannot = (priv_set_ismember (PRIV_SYS_LINKDIR) == 0);
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# else
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/* In traditional Unix, only root can unlink directories. */
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cannot = (geteuid () != ROOT_UID);
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# endif
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initialized = true;
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}
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return cannot;
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}
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#endif
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