dolphin/Externals/hidapi/applied_patches/0004-hidapi-Don-t-leak-device-handle-in-macOS-10.10-or-ne.patch

From 25c85d827aed098d2536f09a68c23780346cd4e1 Mon Sep 17 00:00:00 2001
From: OatmealDome <julian@oatmealdome.me>
Date: Mon, 9 Aug 2021 21:24:10 -0400
Subject: [PATCH] hidapi: Don't leak device handle in macOS 10.10 or newer
 Ported from libusb's hidapi fork. Original patch by Youw
 (cdc473dfe43f6432dda7ad53d7656b8ae8ff968b).

---
 Externals/hidapi/mac/hid.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/Externals/hidapi/mac/hid.c b/Externals/hidapi/mac/hid.c
index d8055f372c..ea945d4dec 100644
--- a/Externals/hidapi/mac/hid.c
+++ b/Externals/hidapi/mac/hid.c
@@ -33,6 +33,9 @@
 
 #include "hidapi.h"
 
+/* As defined in AppKit.h, but we don't need the entire AppKit for a single constant. */
+extern const double NSAppKitVersionNumber;
+
 /* Barrier implementation because Mac OSX doesn't have pthread_barrier.
    It also doesn't have clock_gettime(). So much for POSIX and SUSv2.
    This implementation came from Brent Priddy and was posted on
@@ -177,6 +180,7 @@ static void free_hid_device(hid_device *dev)
 }
 
 static	IOHIDManagerRef hid_mgr = 0x0;
+static	int is_macos_10_10_or_greater = 0;
 
 
 #if 0
@@ -390,6 +394,7 @@ static int init_hid_manager(void)
 int HID_API_EXPORT hid_init(void)
 {
 	if (!hid_mgr) {
+		is_macos_10_10_or_greater = (NSAppKitVersionNumber >= 1343); /* NSAppKitVersionNumber10_10 */
 		return init_hid_manager();
 	}
 
@@ -989,7 +994,7 @@ void HID_API_EXPORT hid_close(hid_device *dev)
 		return;
 
 	/* Disconnect the report callback before close. */
-	if (!dev->disconnected) {
+	if (is_macos_10_10_or_greater || !dev->disconnected) {
 		IOHIDDeviceRegisterInputReportCallback(
 			dev->device_handle, dev->input_report_buf, dev->max_input_report_len,
 			NULL, dev);
@@ -1013,8 +1018,14 @@ void HID_API_EXPORT hid_close(hid_device *dev)
 
 	/* Close the OS handle to the device, but only if it's not
 	   been unplugged. If it's been unplugged, then calling
-	   IOHIDDeviceClose() will crash. */
-	if (!dev->disconnected) {
+	   IOHIDDeviceClose() will crash.
+
+	   UPD: The crash part was true in/until some version of macOS.
+	   Starting with macOS 10.15, there is an opposite effect in some environments:
+	   crash happenes if IOHIDDeviceClose() is not called.
+	   Not leaking a resource in all tested environments.
+	*/
+	if (is_macos_10_10_or_greater || !dev->disconnected) {
 		IOHIDDeviceClose(dev->device_handle, kIOHIDOptionsTypeSeizeDevice);
 	}
 
-- 
2.30.1 (Apple Git-130)