From 3a2b33e0df25238263ae38fb60d5a2c7e534961e Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Tue, 19 Apr 2016 16:08:25 +1000
Subject: [PATCH] win32/handle: add simple handle wrapper

---
 Makefile.am      |  2 ++
 configure.ac     | 18 +++++++++++++-
 win32/handle.cpp | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
 win32/handle.hpp | 36 ++++++++++++++++++++++++++++
 4 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 win32/handle.cpp
 create mode 100644 win32/handle.hpp

diff --git a/Makefile.am b/Makefile.am
index f45633b8..ec1bc824 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -295,6 +295,8 @@ UTIL_FILES += 			\
     library_win32.hpp		\
     library_win32.cpp		\
     time_win32.cpp		\
+    win32/handle.cpp		\
+    win32/handle.hpp		\
     win32/registry.hpp		\
     win32/registry.cpp
 endif
diff --git a/configure.ac b/configure.ac
index 003f2b0c..fc9683e6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,7 +51,23 @@ AC_DEFINE([__STDC_FORMAT_MACROS], [1], [use C format macros])
 AC_FUNC_MMAP
 
 AC_CHECK_FUNC([backtrace])
-AM_CONDITIONAL([HAVE_EXECINFO], [test "x$ac_cv_func_backtrace" = "xtrue"])
+AM_CONDITIONAL([HAVE_EXECINFO], [test "x$ac_cv_func_backtrace" == "xyes"])
+
+AC_MSG_CHECKING([for SymFromAddr])
+save_LIBS="$LIBS"
+LIBS+=-ldbghelp
+AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[
+#include <windows.h>
+#include <dbghelp.h>
+],
+[SymFromAddr(nullptr,0,nullptr,nullptr); return 0;])],[
+    AC_MSG_RESULT([yes])
+], [
+    AC_MSG_RESULT([no])
+    LIBS="$save_LIBS"
+])
+
 
 AC_SEARCH_LIBS([clock_gettime], [rt], [], [
     # windows doesn't have clock_gettime
diff --git a/win32/handle.cpp b/win32/handle.cpp
new file mode 100644
index 00000000..4cccb334
--- /dev/null
+++ b/win32/handle.cpp
@@ -0,0 +1,61 @@
+#include "./handle.hpp"
+
+#include "../except.hpp"
+
+using util::win32::handle;
+
+
+///////////////////////////////////////////////////////////////////////////////
+handle::handle (HANDLE &&h):
+    m_native (h)
+{ ; }
+
+
+//-----------------------------------------------------------------------------
+handle::handle (handle &&rhs):
+    m_native (rhs.m_native)
+{
+    rhs.m_native = nullptr;
+}
+
+
+//-----------------------------------------------------------------------------
+handle::~handle ()
+{
+    CloseHandle (m_native);
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+handle::operator HANDLE& (void) &
+{
+    return native ();
+}
+
+
+//-----------------------------------------------------------------------------
+HANDLE&
+handle::native (void) &
+{
+    return m_native;
+}
+
+
+//-----------------------------------------------------------------------------
+const HANDLE&
+handle::native (void) const &
+{
+    return m_native;
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+handle
+handle::current_process (void)
+{
+    auto process = GetCurrentProcess ();
+    if (!process)
+        util::win32_error::throw_code ();
+
+    return process;
+}
diff --git a/win32/handle.hpp b/win32/handle.hpp
new file mode 100644
index 00000000..ce6b0d76
--- /dev/null
+++ b/win32/handle.hpp
@@ -0,0 +1,36 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2016 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include <windows.h>
+
+namespace util { namespace win32 {
+    struct handle {
+        handle (HANDLE&&);
+        handle (handle&&);
+        handle (void) = delete;
+        handle (const handle&) = delete;
+        ~handle ();
+
+        operator HANDLE& (void) &; 
+        HANDLE& native (void) &;
+        const HANDLE& native (void) const &;
+
+        static handle current_process (void);
+
+    private:
+        HANDLE m_native;
+    };
+} }