QSerialPort::ResourceError called endlessly when USB detached

[kuzulis]

it is already be fixed in 5.6.0

[RamiRosenbaum]

I prefer not to upgrade my Qt version.
There's also the licencing issue that has changed in that version...

[anda_skoa]

Delete the object and recreate it for further use?

Cheers,
_

[HeyYO]

For those coming here from Ubuntu or derivatives, I've uploaded a patched version of qt5 serialport package to my ppa: https://launchpad.net/~hyozd/+archiv...tu/serialplot/ . I basically back-ported fixes from Qt 5.6. Here is the diff:

--- a/src/serialport/qserialport_unix.cpp
+++ b/src/serialport/qserialport_unix.cpp
@@ -208,14 +208,11 @@
 
 void QSerialPortPrivate::close()
 {
-    if (settingsRestoredOnClose) {
-        if (::tcsetattr(descriptor, TCSANOW, &restoredTermios) == -1)
-            setError(getSystemError());
-    }
+    if (settingsRestoredOnClose)
+        ::tcsetattr(descriptor, TCSANOW, &restoredTermios);
 
 #ifdef TIOCNXCL
-    if (::ioctl(descriptor, TIOCNXCL) == -1)
-        setError(getSystemError());
+        ::ioctl(descriptor, TIOCNXCL);
 #endif
 
     if (readNotifier) {
@@ -228,8 +225,7 @@
         writeNotifier = Q_NULLPTR;
     }
 
-    if (qt_safe_close(descriptor) == -1)
-        setError(getSystemError());
+    qt_safe_close(descriptor);
 
     lockFileScopedPointer.reset(Q_NULLPTR);

--- a/src/serialport/qserialport_unix.cpp
+++ b/src/serialport/qserialport_unix.cpp
@@ -208,14 +208,11 @@
 
 void QSerialPortPrivate::close()
 {
-    if (settingsRestoredOnClose) {
-        if (::tcsetattr(descriptor, TCSANOW, &restoredTermios) == -1)
-            setError(getSystemError());
-    }
+    if (settingsRestoredOnClose)
+        ::tcsetattr(descriptor, TCSANOW, &restoredTermios);
 
 #ifdef TIOCNXCL
-    if (::ioctl(descriptor, TIOCNXCL) == -1)
-        setError(getSystemError());
+        ::ioctl(descriptor, TIOCNXCL);
 #endif
 
     if (readNotifier) {
@@ -228,8 +225,7 @@
         writeNotifier = Q_NULLPTR;
     }
 
-    if (qt_safe_close(descriptor) == -1)
-        setError(getSystemError());
+    qt_safe_close(descriptor);
 
     lockFileScopedPointer.reset(Q_NULLPTR);

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