fdl.texi from gnustandards

[gnulib.git] / m4 / openat.m4

diff --git a/m4/openat.m4 b/m4/openat.m4
index e02a11c..80df704 100644 (file)
--- a/m4/openat.m4
+++ b/m4/openat.m4
@@ -1,7 +1,7 @@
-# serial 22
+# serial 29
 # 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) 2004-2010 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.
@@ -25,13 +25,21 @@ AC_DEFUN([gl_FUNC_OPENAT],
   AC_LIBOBJ([openat-proc])
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_CHECK_FUNCS_ONCE([lchmod])
-  AC_REPLACE_FUNCS([fchmodat mkdirat openat])
+  AC_REPLACE_FUNCS([fchmodat fstatat mkdirat openat unlinkat])
   AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+  AC_REQUIRE([gl_FUNC_UNLINK])
   case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
-  yes+yes) ;;
+  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])
@@ -66,7 +74,7 @@ AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
      ln -s conftest.no-such $gl_dangle
      AC_RUN_IFELSE(
        [AC_LANG_SOURCE(
-         [[
+          [[
 #include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -76,10 +84,10 @@ int
 main ()
 {
   return (fchownat (AT_FDCWD, "$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],
@@ -94,8 +102,16 @@ main ()
 # Also use the replacement function if fchownat is simply not available.
 AC_DEFUN([gl_FUNC_FCHOWNAT],
 [
+  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.])
+      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])
@@ -104,6 +120,7 @@ AC_DEFUN([gl_FUNC_FCHOWNAT],
 
 AC_DEFUN([gl_PREREQ_OPENAT],
 [
+  AC_REQUIRE([AC_C_INLINE])
   AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])
   :
 ])