From 3abc288e02089b3143547177e027d3820e5d7e59 Mon Sep 17 00:00:00 2001
From: Vincent Duvert <vincent@duvert.net>
Date: Sun, 7 Jan 2018 11:14:51 +0100
Subject: [PATCH] macOS: Add errno setting in set_report (HID)
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IsDeviceUsable in IOhidapi.cpp uses errno to detect if hid_write failed because of an unconnected Wiimote on a Dolphinbar (it expects errno == EPIPE in this case).
macOS’s implementation of hid_write detected this specific error (IOHIDDeviceSetReport returns kUSBHostReturnPipeStalled) but didn’t set errno so the check failed.
This add errno assignment to failure cases of macOS’s hid_write.
---
 Externals/hidapi/mac/hid.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Externals/hidapi/mac/hid.c b/Externals/hidapi/mac/hid.c
index 46a97886d7..70b615d40d 100644
--- a/Externals/hidapi/mac/hid.c
+++ b/Externals/hidapi/mac/hid.c
@@ -773,8 +773,10 @@ static int set_report(hid_device *dev, IOHIDReportType type, const unsigned char
 	IOReturn res;
 
 	/* Return if the device has been disconnected. */
-	if (dev->disconnected)
+	if (dev->disconnected) {
+		errno = ENODEV;
 		return -1;
+	}
 
 	if (data[0] == 0x0) {
 		/* Not using numbered Reports.
@@ -797,9 +799,14 @@ static int set_report(hid_device *dev, IOHIDReportType type, const unsigned char
 
 		if (res == kIOReturnSuccess) {
 			return length;
-		}
-		else
+		} else if (res == (IOReturn)0xe0005000) {
+		  /* Kernel.framework's IOUSBHostFamily.h defines this error as kUSBHostReturnPipeStalled */
+			errno = EPIPE;
 			return -1;
+		} else {
+			errno = EBUSY;
+			return -1;
+		}
 	}
 
 	return -1;