kc3-lang/gnulib/lib/unlinkdir.c

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• Hash : 7c3f8da8
  Author :
  Date : 2005-09-23T04:15:13
  

  Sync from coreutils.
  
  * .cppi-disable: Add regcomp.c, regex_internal.c, regex_internal.h,
  stat-time.h.
  * argmatch.h: Include verify.h
  (ARGMATCH_VERIFY): Use verify rather than rolling our own.
  (ARGMATCH_ASSERT): Remove; unused.
  * canonicalize.c: Assume STDC_HEADERS.
  * exclude.c: Include "strcase.h".
  * regex_internal.h [!defined _LIBC]: Likewise.
  * getusershell.c: Include stdio--.h rather than stdio.h
  and stdio-safer.h.
  (getusershell): Call fopen, not fopen_safer.
  * save-cwd.c: Include fcntl--.h rather than fcntl.h.
  Do not include unistd-safer.h.
  (save_cwd): Don't call fd_safer; no longer needed
  now that we include fcntl--.h.
  
  * modules/argmatch (Depends-on): Add verify.
  * modules/getloadavg (Depends-on): Depend on fcntl-safer, not
  unistd-safer.
  * modules/save-cwd (Depends-on): Likewise.
  
  * backupfile.m4, calloc.m4, chown.m4, cloexec.m4, dup2.m4:
  * fileblocks.m4, free.m4, ftruncate.m4, getcwd.m4, getpagesize.m4:
  * getugroups.m4, group-member.m4, idcache.m4, link-follow.m4:
  * mkstemp.m4, mktime.m4, mountlist.m4, nanosleep.m4, pathmax.m4:
  * physmem.m4, posixver.m4, putenv.m4, safe-read.m4, same.m4:
  * save-cwd.m4, stdio-safer.m4, unistd-safer.m4, unlinkdir.m4:
  * userspec.m4, xgetcwd.m4, xreadlink.m4:
  Don't bother checking for string.h, stdlib.h, unistd.h.
  * fts.m4 (gl_FUNC_FTS_CORE): Don't require
  AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK; that's now the lstat
  module's job.
  * jm-macros.m4 (gl_MACROS): Likewise.
  * prereq.m4 (gl_PREREQ): Add gl_FUNC_LSTAT.
  
  * backupfile.c: Use ARGMATCH_VERIFY, just in case.
  * posixtm.c (posixtime) [lint]: Initialize *all* of tm0, not just
  the .tm_year member, since otherwise gcc-4.0 would now warn about
  tm_zone, tm_gmtoff, tm_isdst, tm_yday, tm_wday.
  * quotearg.c (quotearg_n_options): Change code to be suboptimal, in
  order to avoid an unsuppressible warning from gcc on 64-bit systems.
  
  * lstat.m4 (gl_FUNC_LSTAT):
  Use AC_LIBSOURCES to require lstat.c and lstat.h.
  Remove obsolete comment.
  * xreadlink.m4: Use AC_LIBSOURCES and AC_LIBOBJ.
  * xstrtod.m4: Likewise.
  

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• lib/unlinkdir.c

• /* unlinkdir.c - determine (and maybe change) whether we can unlink directories
  
     Copyright (C) 2005 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software Foundation,
     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.  */
  
  /* Written by Paul Eggert and Jim Meyering.  */
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  #include "unlinkdir.h"
  
  #if HAVE_PRIV_H
  # include <priv.h>
  #endif
  #include <unistd.h>
  
  #if ! UNLINK_CANNOT_UNLINK_DIR
  
  /* Return true if we cannot unlink directories, false if we might be
     able to unlink directories.  If possible, tell the kernel we don't
     want to be able to unlink directories, so that we can return true.  */
  
  bool
  cannot_unlink_dir (void)
  {
    static bool initialized;
    static bool cannot;
  
    if (! initialized)
      {
  # if defined PRIV_EFFECTIVE && defined PRIV_SYS_LINKDIR
        /* We might be able to unlink directories if we cannot
  	 determine our privileges, or if we have the
  	 PRIV_SYS_LINKDIR privilege and cannot delete it.  */
        priv_set_t *pset = priv_allocset ();
        if (pset)
  	{
  	  cannot =
  	    (getppriv (PRIV_EFFECTIVE, pset) == 0
  	     && (! priv_ismember (pset, PRIV_SYS_LINKDIR)
  		 || (priv_delset (pset, PRIV_SYS_LINKDIR) == 0
  		     && setppriv (PRIV_SET, PRIV_EFFECTIVE, pset) == 0)));
  	  priv_freeset (pset);
  	}
  # else
        /* In traditional Unix, only root can unlink directories.  */
        cannot = (geteuid () != 0);
  # endif
        initialized = true;
      }
  
    return cannot;
  }
  
  #endif
  

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