kc3-lang/gnulib/lib/symlinkat.c

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• Hash : d60f3b0c
  Author :
  Date : 2011-01-01T20:17:23
  

  maint: update almost all copyright ranges to include 2011
  
  Run the new "make update-copyright" rule.
  

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• lib/symlinkat.c

• /* Create a symlink relative to an open directory.
     Copyright (C) 2009-2011 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
  
  /* written by Eric Blake */
  
  #include <config.h>
  
  #include <unistd.h>
  
  #if !HAVE_SYMLINK
  /* Mingw lacks symlink, and it is more efficient to provide a trivial
     wrapper than to go through at-func.c to call rpl_symlink.  */
  
  # include <errno.h>
  
  int
  symlinkat (char const *path1 _GL_UNUSED, int fd _GL_UNUSED,
             char const *path2 _GL_UNUSED)
  {
    errno = ENOSYS;
    return -1;
  }
  
  #else /* HAVE_SYMLINK */
  
  /* Our openat helper functions expect the directory parameter first,
     not second.  These shims make life easier.  */
  
  /* Like symlink, but with arguments reversed.  */
  static int
  symlink_reversed (char const *file, char const *contents)
  {
    return symlink (contents, file);
  }
  
  /* Like symlinkat, but with arguments reversed.  */
  
  static int
  symlinkat_reversed (int fd, char const *file, char const *contents);
  
  # define AT_FUNC_NAME symlinkat_reversed
  # define AT_FUNC_F1 symlink_reversed
  # define AT_FUNC_POST_FILE_PARAM_DECLS , char const *contents
  # define AT_FUNC_POST_FILE_ARGS        , contents
  # include "at-func.c"
  # undef AT_FUNC_NAME
  # undef AT_FUNC_F1
  # undef AT_FUNC_POST_FILE_PARAM_DECLS
  # undef AT_FUNC_POST_FILE_ARGS
  
  /* Create a symlink FILE, in the directory open on descriptor FD,
     holding CONTENTS.  If possible, do it without changing the
     working directory.  Otherwise, resort to using save_cwd/fchdir,
     then symlink/restore_cwd.  If either the save_cwd or the restore_cwd
     fails, then give a diagnostic and exit nonzero.  */
  
  int
  symlinkat (char const *contents, int fd, char const *file)
  {
    return symlinkat_reversed (fd, file, contents);
  }
  
  #endif /* HAVE_SYMLINK */
  

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