From d4c5fbdf0f80a19ecfa4b553b6267641210a8e43 Mon Sep 17 00:00:00 2001
From: cathery <dumdumcathery@gmail.com>
Date: Thu, 7 Nov 2019 21:27:13 +0300
Subject: [PATCH] hiddbg: Add hiddbgIsHdlsVirtualDeviceAttached (#345)

---
 nx/include/switch/services/hiddbg.h |  3 +++
 nx/source/services/hiddbg.c         | 35 +++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/nx/include/switch/services/hiddbg.h b/nx/include/switch/services/hiddbg.h
index c5c6c5b7..c429e394 100644
--- a/nx/include/switch/services/hiddbg.h
+++ b/nx/include/switch/services/hiddbg.h
@@ -182,6 +182,9 @@ Result hiddbgAttachHdlsWorkBuffer(void);
 /// Exit Hdls, must be called at some point prior to hiddbgExit. Only available with [7.0.0+].
 Result hiddbgReleaseHdlsWorkBuffer(void);
 
+/// Checks if the given HdlsHandle is still attached, where the result is written to isAttached.  Only available with [7.0.0+].
+Result hiddbgIsHdlsVirtualDeviceAttached(u64 HdlsHandle, bool *isAttached);
+
 /// Gets state for \ref HiddbgHdlsNpadAssignment. Only available with [7.0.0+].
 Result hiddbgDumpHdlsNpadAssignmentState(HiddbgHdlsNpadAssignment *state);
 
diff --git a/nx/source/services/hiddbg.c b/nx/source/services/hiddbg.c
index 8494c316..a7499062 100644
--- a/nx/source/services/hiddbg.c
+++ b/nx/source/services/hiddbg.c
@@ -392,6 +392,41 @@ Result hiddbgReleaseHdlsWorkBuffer(void) {
     return rc;
 }
 
+Result hiddbgIsHdlsVirtualDeviceAttached(u64 HdlsHandle, bool *isAttached) {
+    Result rc = 0;
+
+    if (hosversionBefore(7,0,0))
+        return MAKERESULT(Module_Libnx, LibnxError_IncompatSysVer);
+
+    if (!g_hiddbgHdlsInitialized)
+        return MAKERESULT(Module_Libnx, LibnxError_NotInitialized);
+
+    rc = _hiddbgCmdNoIO(327);
+    if (R_FAILED(rc)) return rc;
+    if (isAttached) {
+        *isAttached = false;
+        if (hosversionBefore(9,0,0)) {
+            HiddbgHdlsStateListV7 *stateList = (HiddbgHdlsStateListV7*)(g_hiddbgHdlsTmem.src_addr);
+            for (s32 i=0; i<stateList->total_entries; i++) {
+                if (stateList->entries[i].HdlsHandle == HdlsHandle) {
+                    *isAttached = true;
+                    break;
+                }
+            }
+        }
+        else {
+            HiddbgHdlsStateList *stateList = (HiddbgHdlsStateList*)(g_hiddbgHdlsTmem.src_addr);
+            for (s32 i=0; i<stateList->total_entries; i++) {
+                if (stateList->entries[i].HdlsHandle == HdlsHandle) {
+                    *isAttached = true;
+                    break;
+                }
+            }
+        }
+    }
+    return rc;
+}
+
 Result hiddbgDumpHdlsNpadAssignmentState(HiddbgHdlsNpadAssignment *state) {
     Result rc=0;