[PATCH BlueZ v4 11/20] shared/uhid: Keep reading when an event is not available

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

When the fd is non-blocking an event may have been consumed by another
reader of the same fd, e.g. multiple instances of HID over GATT sharing
the fd of the uHID device in unit tests, so keep reading on EAGAIN
instead of stopping.

Assisted-by: OpenCode:claude-opus-5.5
---
 src/shared/uhid.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/shared/uhid.c b/src/shared/uhid.c
index 36a16c331e83..20c55f63b82a 100644
--- a/src/shared/uhid.c
+++ b/src/shared/uhid.c
@@ -169,7 +169,10 @@ static bool uhid_read_handler(struct io *io, void *user_data)
 
 	len = read(fd, &ev, sizeof(ev));
 	if (len < 0)
-		return false;
+		/* Keep reading if the event was consumed by another reader of
+		 * a non-blocking fd.
+		 */
+		return errno == EAGAIN || errno == EINTR;
 
 	if ((size_t) len < sizeof(ev.type))
 		return false;
-- 
2.55.0