Use correct win file open constants, per MinGW

src/lib/win32_os.rs

@@ -32,12 +32,12 @@ mod libc_constants {
     fn O_RDONLY() -> int { ret 0; }
     fn O_WRONLY() -> int { ret 1; }
     fn O_RDWR() -> int { ret 2; }
-    fn O_APPEND() -> int { ret 1024; }
-    fn O_CREAT() -> int { ret 64; }
-    fn O_EXCL() -> int { ret 128; }
-    fn O_TRUNC() -> int { ret 512; }
-    fn O_TEXT() -> int { ret 16384; }
-    fn O_BINARY() -> int { ret 32768; }
+    fn O_APPEND() -> int { ret 0x0008; }
+    fn O_CREAT() -> int { ret 0x0100; }
+    fn O_EXCL() -> int { ret 0x0400; }
+    fn O_TRUNC() -> int { ret 0x0200; }
+    fn O_TEXT() -> int { ret 0x4000; }
+    fn O_BINARY() -> int { ret 0x8000; }
     fn S_IRUSR() -> uint {
         ret 256u; // really _S_IREAD  in win32
 

src/test/run-pass/lib-io.rs

@@ -1,20 +1,17 @@
-
-
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // -*- rust -*-
 use std;
 import std::io;
 import std::str;
 
-fn test_simple(str tmpfilebase) {
-    let str tmpfile = tmpfilebase + ".tmp";
+fn test_simple() {
+    let str tmpfile = "test/run-pass/lib-io-test-simple.tmp";
     log tmpfile;
     let str frood = "A hoopy frood who really knows where his towel is.";
     log frood;
     {
-        let io::writer out = io::file_writer(tmpfile, [io::create]);
+        let io::writer out = io::file_writer(tmpfile, [io::create,
+                                                       io::truncate]);
         out.write_str(frood);
     }
     let io::reader inp = io::file_reader(tmpfile);
@@ -23,4 +20,6 @@ fn test_simple(str tmpfilebase) {
     assert (str::eq(frood, frood2));
 }
 
-fn main(vec[str] argv) { test_simple(argv.(0)); }
+fn main() {
+    test_simple();
+}