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Add option to disable exclusive lock

This commit is contained in:
Will Hedgecock 2021-10-22 12:13:26 -05:00
parent cf5f700ec0
commit f0ff8c39cc
2 changed files with 14 additions and 3 deletions
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5
src/main/c/Posix/SerialPort_Posix.c
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@ -64,6 +64,7 @@ jfieldID parityField;
jfieldID flowControlField;
jfieldID sendDeviceQueueSizeField;
jfieldID receiveDeviceQueueSizeField;
jfieldID disableExclusiveLockField;
jfieldID rs485ModeField;
jfieldID rs485ActiveHighField;
jfieldID rs485DelayBeforeField;
@ -229,6 +230,7 @@ JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_initializeLibrar
flowControlField = (*env)->GetFieldID(env, serialCommClass, "flowControl", "I");
sendDeviceQueueSizeField = (*env)->GetFieldID(env, serialCommClass, "sendDeviceQueueSize", "I");
receiveDeviceQueueSizeField = (*env)->GetFieldID(env, serialCommClass, "receiveDeviceQueueSize", "I");
disableExclusiveLockField = (*env)->GetFieldID(env, serialCommClass, "disableExclusiveLock", "Z");
rs485ModeField = (*env)->GetFieldID(env, serialCommClass, "rs485Mode", "Z");
rs485ActiveHighField = (*env)->GetFieldID(env, serialCommClass, "rs485ActiveHigh", "Z");
rs485DelayBeforeField = (*env)->GetFieldID(env, serialCommClass, "rs485DelayBefore", "I");
@ -252,13 +254,14 @@ JNIEXPORT jlong JNICALL Java_com_fazecast_jSerialComm_SerialPort_openPortNative(
unsigned char isDtrEnabled = (*env)->GetBooleanField(env, obj, isDtrEnabledField);
unsigned char isRtsEnabled = (*env)->GetBooleanField(env, obj, isRtsEnabledField);
unsigned char rs485ModeEnabled = (*env)->GetBooleanField(env, obj, rs485ModeField);
unsigned char disableExclusiveLock = (*env)->GetBooleanField(env, obj, disableExclusiveLockField);
// Try to open existing serial port with read/write access
int serialPortFD = -1;
if ((serialPortFD = open(portName, O_RDWR | O_NOCTTY | O_NONBLOCK)) > 0)
{
// Ensure that multiple root users cannot access the device simultaneously
if (flock(serialPortFD, LOCK_EX | LOCK_NB) == -1)
if (!disableExclusiveLock && (flock(serialPortFD, LOCK_EX | LOCK_NB) == -1))
{
while ((close(serialPortFD) == -1) && (errno == EINTR))
errno = 0;

12
src/main/java/com/fazecast/jSerialComm/SerialPort.java
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@ -393,8 +393,8 @@ public final class SerialPort
private volatile SerialPortDataListener userDataListener = null;
private volatile SerialPortEventListener serialEventListener = null;
private volatile String comPort, friendlyName, portDescription;
private volatile boolean eventListenerRunning = false, disableConfig = false, rs485Mode = false;
private volatile boolean rs485ActiveHigh = true, isRtsEnabled = true, isDtrEnabled = true;
private volatile boolean eventListenerRunning = false, disableConfig = false, disableExclusiveLock = false;
private volatile boolean rs485Mode = false, rs485ActiveHigh = true, isRtsEnabled = true, isDtrEnabled = true;
private SerialPortInputStream inputStream = null;
private SerialPortOutputStream outputStream = null;
@ -520,6 +520,14 @@ public final class SerialPort
*/
public final synchronized void disablePortConfiguration() { disableConfig = true; }
/**
* Disables the library from obtaining an exclusive lock on the serial port.
* <p>
* This function should never be called except on very specific systems which do not support obtaining
* exclusive locks on system resources.
*/
public final synchronized void disableExclusiveLock() { disableExclusiveLock = true; }
// Serial Port Setup Methods
private static native void initializeLibrary(); // Initializes the JNI code
private static native void uninitializeLibrary(); // Un-initializes the JNI code