X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffcntl_h.m4;h=fe7dffdaa06e23e4624c7504d6d070faf3de58b0;hb=ce401f14c2ef12dc46725ffd6f076b75c6ec72a0;hp=35e4b514875e4fe20af0ee4774bbde62300f7616;hpb=4f8569913ab93ef1bd615457b60ae6bd07cf7173;p=gnulib.git

diff --git a/m4/fcntl_h.m4 b/m4/fcntl_h.m4
index 35e4b5148..fe7dffdaa 100644
--- a/m4/fcntl_h.m4
+++ b/m4/fcntl_h.m4
@@ -15,6 +15,9 @@ AC_DEFUN([gl_FCNTL_H],
 	   #include <sys/stat.h>
 	   #include <unistd.h>
 	   #include <fcntl.h>
+	   #ifndef O_NOATIME
+	    #define O_NOATIME 0
+	   #endif
 	   #ifndef O_NOFOLLOW
 	    #define O_NOFOLLOW 0
 	   #endif
@@ -24,23 +27,52 @@ AC_DEFUN([gl_FCNTL_H],
 	      O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
 	    };
 	  ]],
-	  [[static char const sym[] = "conftest.sym";
-	    if (O_NOFOLLOW)
-	      {
-		if (symlink (".", sym) != 0)
-		  return 1;
-		if (0 <= open (sym, O_RDONLY | O_NOFOLLOW))
-		  return 1;
-	      }
-	    return !constants;]])],
+	  [[
+	    int status = !constants;
+	    {
+	      static char const sym[] = "conftest.sym";
+	      if (symlink (".", sym) != 0
+		  || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
+		status |= 32;
+	    }
+	    {
+	      static char const file[] = "confdefs.h";
+	      int fd = open (file, O_RDONLY | O_NOATIME);
+	      char c;
+	      struct stat st0, st1;
+	      if (fd < 0
+		  || fstat (fd, &st0) != 0
+		  || sleep (1) != 0
+		  || read (fd, &c, 1) != 1
+		  || close (fd) != 0
+		  || stat (file, &st1) != 0
+		  || st1.st_mtime <= st0.st_mtime
+		  || close (fd) != 0)
+		status |= 64;
+	    }
+	    return status;]])],
        [gl_cv_header_working_fcntl_h=yes],
-       [gl_cv_header_working_fcntl_h=no],
+       [case $? in #(
+	32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
+	64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
+	96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
+	 *) gl_cv_header_working_fcntl_h='no';;
+	esac],
        [gl_cv_header_working_fcntl_h=cross-compiling])])
 
-  if test $gl_cv_header_working_fcntl_h != yes; then
-    AC_DEFINE([O_NOFOLLOW_IS_INEFFECTIVE], 1,
-      [Define to 1 if O_NOFOLLOW is ineffective.])
-  fi
+  case $gl_cv_header_working_fcntl_h in #(
+  *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
+  *) ac_val=1;;
+  esac
+  AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
+    [Define to 1 if O_NOATIME works.])
+
+  case $gl_cv_header_working_fcntl_h in #(
+  *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
+  *) ac_val=1;;
+  esac
+  AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
+    [Define to 1 if O_NOFOLLOW works.])
 
   gl_ABSOLUTE_HEADER([fcntl.h])
   ABSOLUTE_FCNTL_H=\"$gl_cv_absolute_fcntl_h\"