# SDL: Don't enumerate HID devices on macOS if we don't have input monitoring permissions

**URL:** <https://discourse.libsdl.org/t/sdl-dont-enumerate-hid-devices-on-macos-if-we-dont-have-input-monitoring-permissions/38822>\
**Category:** SDL Commits\
**Created:** [September 16, 2022, 4:20pm UTC](https://discourse.libsdl.org/t/sdl-dont-enumerate-hid-devices-on-macos-if-we-dont-have-input-monitoring-permissions/38822 "2022-09-16T16:20:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SDLPushPostBot](https://discourse.libsdl.org/user_avatar/discourse.libsdl.org/sdlpushpostbot/32/4370_2.png) [@SDLPushPostBot](https://discourse.libsdl.org/u/SDLPushPostBot)\
**Post date:** [September 16, 2022, 4:20pm UTC](https://discourse.libsdl.org/t/sdl-dont-enumerate-hid-devices-on-macos-if-we-dont-have-input-monitoring-permissions/38822/1 "2022-09-16T16:20:02Z")

</div>

> <https://github.com/libsdl-org/SDL/commit/172865ff137532123ec06177119be163ba1811f5>
>
> Unfortunately the only way to detect this is to actually try opening a device, s…o we wait until the application tries, and then stop enumerating afterwards.
> 
> Fixes https://github.com/libsdl-org/SDL/issues/5781

```diff
From 172865ff137532123ec06177119be163ba1811f5 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 16 Sep 2022 09:16:18 -0700
Subject: [PATCH] Don't enumerate HID devices on macOS if we don't have input
 monitoring permissions

Unfortunately the only way to detect this is to actually try opening a device, so we wait until the application tries, and then stop enumerating afterwards.

Fixes https://github.com/libsdl-org/SDL/issues/5781
---
 src/hidapi/mac/hid.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/hidapi/mac/hid.c b/src/hidapi/mac/hid.c
index 35ca3803745..445de68231b 100644
--- a/src/hidapi/mac/hid.c
+++ b/src/hidapi/mac/hid.c
@@ -130,6 +130,7 @@ struct hid_device_list_node
 
 static IOHIDManagerRef hid_mgr = 0x0;
 static struct hid_device_list_node *device_list = 0x0;
+static	int hid_input_monitoring_denied = 0;
 
 static hid_device *new_hid_device(void)
 {
@@ -521,7 +522,11 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id,
 	/* Set up the HID Manager if it hasn't been done */
 	if (hid_init() < 0)
 		return NULL;
-	
+
+	/* If we don't have permission do open devices, don't enumerate them */
+	if (hid_input_monitoring_denied)
+ return NULL;
+
 	/* give the IOHIDManager a chance to update itself */
 	process_pending_events();
 	
@@ -862,6 +867,11 @@ hid_device * HID_API_EXPORT hid_open_path(const char *path, int bExclusive)
 				
 				return dev;
 			}
+ else if (ret == kIOReturnNotPermitted) {
+ /* This application doesn't have input monitoring permissions */
+ hid_input_monitoring_denied = 1;
+ goto return_error;
+ }
 			else {
 				goto return_error;
 			}

```