-# serial 25
+# serial 31
# See if we need to use our replacement for Solaris' openat et al functions.
-dnl Copyright (C) 2004-2009 Free Software Foundation, Inc.
+dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
[
+ dnl Persuade glibc's <unistd.h> to declare fchownat().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
gl_cv_func_fchownat_nofollow_works,
[
ln -s conftest.no-such $gl_dangle
AC_RUN_IFELSE(
[AC_LANG_SOURCE(
- [[
+ [[
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
main ()
{
return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
- AT_SYMLINK_NOFOLLOW) != 0
- && errno == ENOENT);
+ AT_SYMLINK_NOFOLLOW) != 0
+ && errno == ENOENT);
}
- ]])],
+ ]])],
[gl_cv_func_fchownat_nofollow_works=yes],
[gl_cv_func_fchownat_nofollow_works=no],
[gl_cv_func_fchownat_nofollow_works=no],
AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
])
+# gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
+AC_DEFUN([gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG],
+[
+ dnl Persuade glibc's <unistd.h> to declare fchownat().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ AC_CACHE_CHECK([whether fchownat works with an empty file name],
+ [gl_cv_func_fchownat_empty_filename_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <unistd.h>
+ #include <fcntl.h>
+ ]],
+ [[int fd;
+ int ret;
+ if (mkdir ("conftestdir", 0700) < 0)
+ return 2;
+ fd = open ("conftestdir", O_RDONLY);
+ if (fd < 0)
+ return 3;
+ ret = fchownat (fd, "", -1, -1, 0);
+ close (fd);
+ rmdir ("conftestdir");
+ return ret == 0;
+ ]])],
+ [gl_cv_func_fchownat_empty_filename_works=yes],
+ [gl_cv_func_fchownat_empty_filename_works=no],
+ [gl_cv_func_fchownat_empty_filename_works="guessing no"])
+ ])
+ AS_IF([test "$gl_cv_func_fchownat_empty_filename_works" != yes], [$1], [$2])
+])
+
# If we have the fchownat function, and it has the bug (in glibc-2.4)
# that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
# use the replacement function.
+# Also if the fchownat function, like chown, has the trailing slash bug,
+# use the replacement function.
# Also use the replacement function if fchownat is simply not available.
AC_DEFUN([gl_FUNC_FCHOWNAT],
[
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_CHOWN])
AC_CHECK_FUNC([fchownat],
- [gl_FUNC_FCHOWNAT_DEREF_BUG([REPLACE_FCHOWNAT=1])],
+ [gl_FUNC_FCHOWNAT_DEREF_BUG(
+ [REPLACE_FCHOWNAT=1
+ AC_DEFINE([FCHOWNAT_NOFOLLOW_BUG], [1],
+ [Define to 1 if your platform has fchownat, but it cannot
+ perform lchown tasks.])
+ ])
+ gl_FUNC_FCHOWNAT_EMPTY_FILENAME_BUG(
+ [REPLACE_FCHOWNAT=1
+ AC_DEFINE([FCHOWNAT_EMPTY_FILENAME_BUG], [1],
+ [Define to 1 if your platform has fchownat, but it does
+ not reject an empty file name.])
+ ])
+ if test $REPLACE_CHOWN = 1; then
+ REPLACE_FCHOWNAT=1
+ fi],
[HAVE_FCHOWNAT=0])
if test $HAVE_FCHOWNAT = 0 || test $REPLACE_FCHOWNAT = 1; then
AC_LIBOBJ([fchownat])
AC_DEFUN([gl_PREREQ_OPENAT],
[
+ AC_REQUIRE([AC_C_INLINE])
AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
:
])