uschindler commented on issue #11772:
URL: https://github.com/apache/lucene/issues/11772#issuecomment-1246993380
This is how to call `getpid()` with Java 19 (you need to enable preview APIS
and also enable access to native code (disabled for secuirty by default):
```java
var cLinker = Linker.nativeLinker();
// Using a MethodHandle
MethodHandle getpidMH =
cLinker.downcallHandle(cLinker.defaultLookup().lookup("getpid").get(),
FunctionDescriptor.of(JAVA_INT));
int pid = (int) getpidMH.invokeExact();
System.out.printf("MethodHandle calling getpid() (%d)\n", pid);
```
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