-# serial 27
+# serial 37
# See if we need to use our replacement for Solaris' openat et al functions.
-dnl Copyright (C) 2004-2010 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.
GNULIB_FCHOWNAT=1
GNULIB_UNLINKAT=1
- AC_LIBOBJ([openat-proc])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_FUNCS_ONCE([lchmod])
- AC_REPLACE_FUNCS([fchmodat fstatat mkdirat openat unlinkat])
- AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+ AC_CHECK_FUNCS_ONCE([fchmodat lchmod mkdirat openat unlinkat])
+ AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
AC_REQUIRE([gl_FUNC_UNLINK])
- case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
+ case $ac_cv_func_openat+$gl_cv_func_lstat_dereferences_slashed_symlink in
yes+yes)
# GNU/Hurd has unlinkat, but it has the same bug as unlink.
if test $REPLACE_UNLINK = 1; then
- AC_LIBOBJ([unlinkat])
REPLACE_UNLINKAT=1
fi ;;
yes+*)
# Solaris 9 has *at functions, but uniformly mishandles trailing
# slash in all of them.
- AC_LIBOBJ([openat])
REPLACE_OPENAT=1
- AC_LIBOBJ([fstatat])
- REPLACE_FSTATAT=1
- AC_LIBOBJ([unlinkat])
REPLACE_UNLINKAT=1
;;
*)
HAVE_OPENAT=0
HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
- HAVE_FSTATAT=0 # No known system with fstatat but not openat
gl_PREREQ_OPENAT;;
esac
if test $ac_cv_func_fchmodat != yes; then
HAVE_MKDIRAT=0
fi
gl_FUNC_FCHOWNAT
+ gl_FUNC_FSTATAT
+
+ dnl This is tested at least via getcwd.c.
+ gl_MODULE_INDICATOR([openat])
])
# 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,
[
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
- AC_DEFINE([FCHOWNAT_NOFOLLOW_BUG], [1], [Define to 1 if your
- platform has fchownat, but it cannot perform lchown tasks.])])],
+ [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 $REPLACE_CHOWN = 1; then
- REPLACE_FCHOWNAT=1
- fi
- if test $HAVE_FCHOWNAT = 0 || test $REPLACE_FCHOWNAT = 1; then
- AC_LIBOBJ([fchownat])
+])
+
+# If we have the fstatat function, and it has the bug (in AIX 7.1)
+# that it does not fill in st_size correctly, use the replacement function.
+AC_DEFUN([gl_FUNC_FSTATAT],
+[
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+ AC_CHECK_FUNCS_ONCE([fstatat])
+
+ if test $ac_cv_func_fstatat = no; then
+ HAVE_FSTATAT=0
+ else
+ dnl Test for an AIX 7.1 bug; see
+ dnl <http://lists.gnu.org/archive/html/bug-tar/2011-09/msg00015.html>.
+ AC_CACHE_CHECK([whether fstatat (..., 0) works],
+ [gl_cv_func_fstatat_zero_flag],
+ [gl_cv_func_fstatat_zero_flag=no
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE(
+ [[
+ #include <fcntl.h>
+ #include <sys/stat.h>
+ int
+ main (void)
+ {
+ struct stat a;
+ return fstatat (AT_FDCWD, ".", &a, 0) != 0;
+ }
+ ]])],
+ [gl_cv_func_fstatat_zero_flag=yes])])
+
+ case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in
+ yes+yes) ;;
+ *) REPLACE_FSTATAT=1
+ if test $gl_cv_func_fstatat_zero_flag != yes; then
+ AC_DEFINE([FSTATAT_ZERO_FLAG_BROKEN], [1],
+ [Define to 1 if fstatat (..., 0) does not work,
+ as in AIX 7.1.])
+ fi
+ ;;
+ esac
fi
])
projects / gnulib.git / blobdiff