OpenSearch/plugins/discovery-multicast
Lee Hinman 482843e27b Fix build to run correctly on FreeBSD
This adds the required changes/checks so that the build can run on
FreeBSD.

There are a few things that differ between FreeBSD and Linux:

- CPU probes return -1 for CPU usage
- `hot_threads` cannot be supported on FreeBSD

From OpenJDK's `os_bsd.cpp`:

```c++
bool os::is_thread_cpu_time_supported() {
  #ifdef __APPLE__
  return true;
  #else
  return false;
  #endif
}
```

So this API now returns (for each FreeBSD node):

```
curl -s localhost:9200/_nodes/hot_threads
::: {Devil Hunter Gabriel}{q8OJnKCcQS6EB9fygU4R4g}{127.0.0.1}{127.0.0.1:9300}
   hot_threads is not supported on FreeBSD
```

- multicast fails in native `join` method - known bug:
  https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193246

Which causes:

```
1> Caused by: java.net.SocketException: Invalid argument
1>    at java.net.PlainDatagramSocketImpl.join(Native Method)
1>    at java.net.AbstractPlainDatagramSocketImpl.join(AbstractPlainDatagramSocketImpl.java:179)
1>    at java.net.MulticastSocket.joinGroup(MulticastSocket.java:323)
1>    at org.elasticsearch.plugin.discovery.multicast.MulticastChannel$Plain.buildMulticastSocket(MulticastChannel.java:309)
```

So these tests are skipped on FreeBSD.

Resolves #15562
2015-12-22 12:36:04 -07:00
..
src Fix build to run correctly on FreeBSD 2015-12-22 12:36:04 -07:00
build.gradle Switch build system to Gradle 2015-10-29 11:40:19 -07:00