[Windows] CreateFileMapping/CreateSemaphore with LPSECURITY_ATTRIBUTES.

src/platform/get_sa.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <securitybaseapi.h>
+
+namespace ipc {
+namespace detail {
+
+inline LPSECURITY_ATTRIBUTES get_sa() {
+    static struct initiator {
+
+        SECURITY_DESCRIPTOR sd_;
+        SECURITY_ATTRIBUTES sa_;
+
+        bool succ_ = false;
+
+        initiator() {
+            if (!::InitializeSecurityDescriptor(&sd_, SECURITY_DESCRIPTOR_REVISION)) {
+                ipc::error("fail InitializeSecurityDescriptor[%d]\n", static_cast<int>(::GetLastError()));
+                return;
+            }
+            if (!::SetSecurityDescriptorDacl(&sd_, TRUE, NULL, FALSE)) {
+                ipc::error("fail SetSecurityDescriptorDacl[%d]\n", static_cast<int>(::GetLastError()));
+                return;
+            }
+            sa_.nLength = sizeof(SECURITY_ATTRIBUTES);
+            sa_.bInheritHandle = FALSE;
+            sa_.lpSecurityDescriptor = &sd_;
+            succ_ = true;
+        }
+    } handle;
+    return handle.succ_ ? &handle.sa_ : nullptr;
+}
+
+} // namespace detail
+} // namespace ipc

src/platform/shm_win.cpp

@@ -10,6 +10,7 @@
 #include "pool_alloc.h"
 
 #include "platform/to_tchar.h"
+#include "platform/get_sa.h"
 #include "memory/resource.h"
 
 namespace {
@@ -38,7 +39,7 @@ id_t acquire(char const * name, std::size_t size, unsigned mode) {
     }
     // Creates or opens a named file mapping object for a specified file.
     else {
-        h = ::CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE | SEC_COMMIT,
+        h = ::CreateFileMapping(INVALID_HANDLE_VALUE, detail::get_sa(), PAGE_READWRITE | SEC_COMMIT,
                                 0, static_cast<DWORD>(size), fmt_name.c_str());
         // If the object exists before the function call, the function returns a handle to the existing object 
         // (with its current size, not the specified size), and GetLastError returns ERROR_ALREADY_EXISTS.

src/platform/to_tchar.h

@@ -13,7 +13,8 @@
 #include "platform/detail.h"
 #include "memory/resource.h"
 
-namespace ipc::detail {
+namespace ipc {
+namespace detail {
 
 struct has_value_type_ {
     template <typename T> static std::true_type  check(typename T::value_type *);
@@ -64,4 +65,5 @@ inline auto to_tchar(T* dst, char const * src, std::size_t size) -> IsSameChar<T
     std::memcpy(dst, wstr.data(), (ipc::detail::min)(wstr.size(), size));
 }
 
-} // namespace ipc::detail
+} // namespace detail
+} // namespace ipc

src/platform/waiter_win.h

@@ -11,6 +11,7 @@
 #include "shm.h"
 
 #include "platform/to_tchar.h"
+#include "platform/get_sa.h"
 #include "platform/detail.h"
 #include "memory/resource.h"
 
@@ -24,7 +25,7 @@ public:
     static void remove(char const * /*name*/) {}
 
     bool open(ipc::string && name, long count = 0, long limit = LONG_MAX) {
-        h_ = ::CreateSemaphore(NULL, count, limit, ipc::detail::to_tchar(std::move(name)).c_str());
+        h_ = ::CreateSemaphore(detail::get_sa(), count, limit, ipc::detail::to_tchar(std::move(name)).c_str());
         if (h_ == NULL) {
             ipc::error("fail CreateSemaphore[%lu]: %s\n", ::GetLastError(), name.c_str());
             return false;