kc3-lang/gnulib/m4/rename.m4

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• Hash : d462fe17
  Author :
  Date : 2009-11-08T18:11:50
  

  rename: detect FreeBSD bug
  
  rename("link-to-file/","new") mistakenly succeeded.
  
  * m4/rename.m4 (gl_FUNC_RENAME): Also detect FreeBSD bug with
  slash on symlink.
  * modules/renameat-tests (Depends-on): Add filenamecat.
  * tests/test-rename.h (test_rename): Allow one more errno.
  * tests/test-renameat.c (main): Likewise.
  * doc/posix-functions/rename.texi (rename): Document the bug.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• m4/rename.m4

• # serial 21
  
  # Copyright (C) 2001, 2003, 2005, 2006, 2009 Free Software Foundation, Inc.
  # This file is free software; the Free Software Foundation
  # gives unlimited permission to copy and/or distribute it,
  # with or without modifications, as long as this notice is preserved.
  
  dnl From Volker Borchert.
  dnl Determine whether rename works for source file names with a trailing slash.
  dnl The rename from SunOS 4.1.1_U1 doesn't.
  dnl
  dnl If it doesn't, then define RENAME_TRAILING_SLASH_BUG and arrange
  dnl to compile the wrapper function.
  dnl
  
  AC_DEFUN([gl_FUNC_RENAME],
  [
    AC_REQUIRE([AC_CANONICAL_HOST])
    AC_REQUIRE([gl_STDIO_H_DEFAULTS])
    AC_CHECK_FUNCS_ONCE([lstat])
  
    dnl Solaris 10 mistakenly allows rename("file","name/").
    dnl NetBSD 1.6 mistakenly forbids rename("dir","name/").
    dnl FreeBSD 7.2 mistakenly allows rename("file","link-to-file/").
    dnl The Solaris bug can be worked around without stripping
    dnl trailing slash, while the NetBSD bug requires stripping;
    dnl the two conditions can be distinguished by whether hard
    dnl links are also broken.
    AC_CACHE_CHECK([whether rename honors trailing slash on destination],
      [gl_cv_func_rename_slash_dst_works],
      [rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.lnk
      touch conftest.f && mkdir conftest.d1 ||
        AC_MSG_ERROR([cannot create temporary files])
      # Assume that if we have lstat, we can also check symlinks.
      if test $ac_cv_func_lstat = yes; then
        ln -s conftest.f conftest.lnk
      fi
      AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  #       include <stdio.h>
  #       include <stdlib.h>
  ]], [if (rename ("conftest.f", "conftest.f1/") == 0) return 1;
       if (rename ("conftest.d1", "conftest.d2/") != 0) return 2;
  #if HAVE_LSTAT
       if (rename ("conftest.f", "conftest.lnk/") == 0) return 3;
  #endif
      ])],
        [gl_cv_func_rename_slash_dst_works=yes],
        [gl_cv_func_rename_slash_dst_works=no],
        dnl When crosscompiling, assume rename is broken.
        [gl_cv_func_rename_slash_dst_works="guessing no"])
      rm -rf conftest.f conftest.f1 conftest.d1 conftest.d2 conftest.lnk
    ])
    if test "x$gl_cv_func_rename_slash_dst_works" != xyes; then
      AC_LIBOBJ([rename])
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_TRAILING_SLASH_DEST_BUG], [1],
        [Define if rename does not correctly handle slashes on the destination
         argument, such as on Solaris 10 or NetBSD 1.6.])
    fi
  
    dnl SunOS 4.1.1_U1 mistakenly forbids rename("dir/","name").
    dnl Solaris 9 mistakenly allows rename("file/","name").
    dnl FreeBSD 7.2 mistakenly allows rename("link-to-file/","name").
    dnl These bugs require stripping trailing slash to avoid corrupting
    dnl symlinks with a trailing slash.
    AC_CACHE_CHECK([whether rename honors trailing slash on source],
      [gl_cv_func_rename_slash_src_works],
      [rm -rf conftest.f conftest.d1 conftest.d2 conftest.lnk
      touch conftest.f && mkdir conftest.d1 ||
        AC_MSG_ERROR([cannot create temporary files])
      # Assume that if we have lstat, we can also check symlinks.
      if test $ac_cv_func_lstat = yes; then
        ln -s conftest.f conftest.lnk
      fi
      AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  #       include <stdio.h>
  #       include <stdlib.h>
  ]], [if (rename ("conftest.f/", "conftest.d2") == 0) return 1;
       if (rename ("conftest.d1/", "conftest.d2") != 0) return 2;
  #if HAVE_LSTAT
       if (rename ("conftest.lnk/", "conftest.f") == 0) return 3;
  #endif
      ])],
        [gl_cv_func_rename_slash_src_works=yes],
        [gl_cv_func_rename_slash_src_works=no],
        dnl When crosscompiling, assume rename is broken.
        [gl_cv_func_rename_slash_src_works="guessing no"])
      rm -rf conftest.f conftest.d1 conftest.d2 conftest.lnk
    ])
    if test "x$gl_cv_func_rename_slash_src_works" != xyes; then
      AC_LIBOBJ([rename])
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_TRAILING_SLASH_SOURCE_BUG], [1],
        [Define if rename does not correctly handle slashes on the source
         argument, such as on Solaris 9 or cygwin 1.5.])
    fi
  
    dnl NetBSD 1.6 and cygwin 1.5.x mistakenly reduce hard link count
    dnl on rename("h1","h2").
    dnl This bug requires stat'ting targets prior to attempting rename.
    AC_CACHE_CHECK([whether rename manages hard links correctly],
      [gl_cv_func_rename_link_works],
      [rm -rf conftest.f conftest.f1
      if touch conftest.f && ln conftest.f conftest.f1 &&
          set x `ls -i conftest.f conftest.f1` && test "$2" = "$4"; then
        AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  #       include <stdio.h>
  #       include <stdlib.h>
  #       include <unistd.h>
  ]], [if (rename ("conftest.f", "conftest.f1")) return 1;
       if (unlink ("conftest.f1")) return 2;
       if (rename ("conftest.f", "conftest.f")) return 3;
       if (rename ("conftest.f1", "conftest.f1") == 0) return 4;])],
          [gl_cv_func_rename_link_works=yes],
          [gl_cv_func_rename_link_works=no],
          dnl When crosscompiling, assume rename is broken.
          [gl_cv_func_rename_link_works="guessing no"])
      else
        gl_cv_func_rename_link_works="guessing no"
      fi
      rm -rf conftest.f conftest.f1
    ])
    if test "x$gl_cv_func_rename_link_works" != xyes; then
      AC_LIBOBJ([rename])
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_HARD_LINK_BUG], [1],
        [Define if rename fails to leave hard links alone, as on NetBSD 1.6
         or Cygwin 1.5.])
    fi
  
    dnl Cygwin 1.5.x mistakenly allows rename("dir","file").
    dnl mingw mistakenly forbids rename("dir1","dir2").
    dnl These bugs require stripping trailing slash to avoid corrupting
    dnl symlinks with a trailing slash.
    AC_CACHE_CHECK([whether rename manages existing destinations correctly],
      [gl_cv_func_rename_dest_works],
      [rm -rf conftest.f conftest.d1 conftest.d2
      touch conftest.f && mkdir conftest.d1 conftest.d2 ||
        AC_MSG_ERROR([cannot create temporary files])
      AC_RUN_IFELSE([AC_LANG_PROGRAM([[
  #       include <stdio.h>
  #       include <stdlib.h>
  ]], [if (rename ("conftest.d1", "conftest.d2") != 0) return 1;
       if (rename ("conftest.d2", "conftest.f") == 0) return 2;])],
        [gl_cv_func_rename_dest_works=yes],
        [gl_cv_func_rename_dest_works=no],
        dnl When crosscompiling, assume rename is broken.
        [gl_cv_func_rename_dest_works="guessing no"])
      rm -rf conftest.f conftest.d1 conftest.d2
    ])
    if test "x$gl_cv_func_rename_dest_works" != xyes; then
      AC_LIBOBJ([rename])
      REPLACE_RENAME=1
      AC_DEFINE([RENAME_DEST_EXISTS_BUG], [1],
        [Define if rename does not work when the destination file exists,
         as on Cygwin 1.5 or Windows.])
    fi
  ])
  

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