X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fchown.m4;h=fa46981b2274e8277036e00c1313d6bb1db926df;hb=060a5ab2b25c067185f3c3c077287c65723ea985;hp=5bedfa192bafb5dc42137e7f7b3d653eabc4f502;hpb=69637233ce151566c1a861bce77e1ca32305638e;p=gnulib.git

diff --git a/m4/chown.m4 b/m4/chown.m4
index 5bedfa192..fa46981b2 100644
--- a/m4/chown.m4
+++ b/m4/chown.m4
@@ -1,8 +1,8 @@
-# serial 21
+# serial 25
 # Determine whether we need the chown wrapper.
 
-dnl Copyright (C) 1997-2001, 2003-2005, 2007, 2009
-dnl Free Software Foundation, Inc.
+dnl Copyright (C) 1997-2001, 2003-2005, 2007, 2009-2011 Free Software
+dnl Foundation, Inc.
 
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -22,20 +22,25 @@ AC_DEFUN_ONCE([gl_FUNC_CHOWN],
   AC_REQUIRE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK])
   AC_CHECK_FUNCS_ONCE([chown fchown])
 
+  dnl mingw lacks chown altogether.
   if test $ac_cv_func_chown = no; then
     HAVE_CHOWN=0
-    AC_LIBOBJ([chown])
   else
+    dnl Some old systems treated chown like lchown.
     if test $gl_cv_func_chown_follows_symlink = no; then
       REPLACE_CHOWN=1
-      AC_LIBOBJ([chown])
     fi
+
+    dnl Some old systems tried to use uid/gid -1 literally.
     if test $ac_cv_func_chown_works = no; then
       AC_DEFINE([CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE], [1],
         [Define if chown is not POSIX compliant regarding IDs of -1.])
       REPLACE_CHOWN=1
-      AC_LIBOBJ([chown])
     fi
+
+    dnl Solaris 9 ignores trailing slash.
+    dnl FreeBSD 7.2 mishandles trailing slash on symlinks.
+    dnl Likewise for AIX 7.1.
     AC_CACHE_CHECK([whether chown honors trailing slash],
       [gl_cv_func_chown_slash_works],
       [touch conftest.file && rm -f conftest.link
@@ -52,12 +57,35 @@ AC_DEFUN_ONCE([gl_FUNC_CHOWN],
       rm -f conftest.link conftest.file])
     if test "$gl_cv_func_chown_slash_works" != yes; then
       AC_DEFINE([CHOWN_TRAILING_SLASH_BUG], [1],
-        [Define if chown mishandles trailing slash.])
+        [Define to 1 if chown mishandles trailing slash.])
       REPLACE_CHOWN=1
-      AC_LIBOBJ([chown])
     fi
-    if test $REPLACE_CHOWN = 1 && test $ac_cv_func_fchown = no; then
-      AC_LIBOBJ([fchown-stub])
+
+    dnl OpenBSD fails to update ctime if ownership does not change.
+    AC_CACHE_CHECK([whether chown always updates ctime],
+      [gl_cv_func_chown_ctime_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+]], [[    struct stat st1, st2;
+          if (close (creat ("conftest.file", 0600))) return 1;
+          if (stat ("conftest.file", &st1)) return 2;
+          sleep (1);
+          if (chown ("conftest.file", st1.st_uid, st1.st_gid)) return 3;
+          if (stat ("conftest.file", &st2)) return 4;
+          if (st2.st_ctime <= st1.st_ctime) return 5;
+        ]])],
+        [gl_cv_func_chown_ctime_works=yes],
+        [gl_cv_func_chown_ctime_works=no],
+        [gl_cv_func_chown_ctime_works="guessing no"])
+      rm -f conftest.file])
+    if test "$gl_cv_func_chown_ctime_works" != yes; then
+      AC_DEFINE([CHOWN_CHANGE_TIME_BUG], [1], [Define to 1 if chown fails
+        to change ctime when at least one argument was not -1.])
+      REPLACE_CHOWN=1
     fi
   fi
 ])
@@ -74,24 +102,28 @@ AC_DEFUN_ONCE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK],
 #include <stdlib.h>
 #include <errno.h>
 
-	int
-	main ()
-	{
-	  char const *dangling_symlink = "conftest.dangle";
+        int
+        main ()
+        {
+          int result = 0;
+          char const *dangling_symlink = "conftest.dangle";
 
-	  unlink (dangling_symlink);
-	  if (symlink ("conftest.no-such", dangling_symlink))
-	    abort ();
+          unlink (dangling_symlink);
+          if (symlink ("conftest.no-such", dangling_symlink))
+            abort ();
 
-	  /* Exit successfully on a conforming system,
-	     i.e., where chown must fail with ENOENT.  */
-	  exit ( ! (chown (dangling_symlink, getuid (), getgid ()) != 0
-		    && errno == ENOENT));
-	}
-	]])],
-	[gl_cv_func_chown_follows_symlink=yes],
-	[gl_cv_func_chown_follows_symlink=no],
-	[gl_cv_func_chown_follows_symlink=yes]
+          /* Exit successfully on a conforming system,
+             i.e., where chown must fail with ENOENT.  */
+          if (chown (dangling_symlink, getuid (), getgid ()) == 0)
+            result |= 1;
+          if (errno != ENOENT)
+            result |= 2;
+          return result;
+        }
+        ]])],
+        [gl_cv_func_chown_follows_symlink=yes],
+        [gl_cv_func_chown_follows_symlink=no],
+        [gl_cv_func_chown_follows_symlink=yes]
       )
     ]
   )