-#serial 11
+# serial 35
# See if we need to use our replacement for Solaris' openat et al functions.
-dnl Copyright (C) 2004, 2005, 2006 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.
AC_DEFUN([gl_FUNC_OPENAT],
[
- # No system provides these functions; compile them unconditionally.
- AC_LIBOBJ([mkdirat])
- AC_LIBOBJ([fchmodat])
+ AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+ GNULIB_OPENAT=1
+
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+ GNULIB_FCHMODAT=1
+ GNULIB_FSTATAT=1
+ GNULIB_MKDIRAT=1
+
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ GNULIB_FCHOWNAT=1
+ GNULIB_UNLINKAT=1
- AC_LIBOBJ([openat-die])
- AC_LIBOBJ([openat-proc])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_FUNCS_ONCE([lchmod])
- AC_CHECK_FUNCS_ONCE([fdopendir])
- AC_REPLACE_FUNCS(openat)
- case $ac_cv_func_openat in
- yes) ;;
+ AC_CHECK_FUNCS_ONCE([fchmodat lchmod mkdirat openat unlinkat])
+ AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+ AC_REQUIRE([gl_FUNC_UNLINK])
+ case $ac_cv_func_openat+$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
+ REPLACE_UNLINKAT=1
+ fi ;;
+ yes+*)
+ # Solaris 9 has *at functions, but uniformly mishandles trailing
+ # slash in all of them.
+ REPLACE_OPENAT=1
+ REPLACE_UNLINKAT=1
+ ;;
*)
- AC_DEFINE([__OPENAT_PREFIX], [[rpl_]],
- [Define to rpl_ if the openat replacement function should be used.])
+ HAVE_OPENAT=0
+ HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
gl_PREREQ_OPENAT;;
esac
+ if test $ac_cv_func_fchmodat != yes; then
+ HAVE_FCHMODAT=0
+ fi
+ if test $ac_cv_func_mkdirat != yes; then
+ HAVE_MKDIRAT=0
+ fi
+ gl_FUNC_FCHOWNAT
+ gl_FUNC_FSTATAT
+])
+
+# 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,
+ [
+ gl_dangle=conftest.dangle
+ # Remove any remnants of a previous test.
+ rm -f $gl_dangle
+ # Arrange for deletion of the temporary file this test creates.
+ ac_clean_files="$ac_clean_files $gl_dangle"
+ ln -s conftest.no-such $gl_dangle
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE(
+ [[
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+int
+main ()
+{
+ return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
+ 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
+ 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 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
+ elif test $gl_cv_func_lstat_dereferences_slashed_symlink != yes; then
+ REPLACE_FSTATAT=1
+ fi
])
AC_DEFUN([gl_PREREQ_OPENAT],
[
- AC_REQUIRE([gl_SAVE_CWD])
+ AC_REQUIRE([AC_C_INLINE])
+ AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
+ :
])
projects / gnulib.git / blobdiff