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Make DaemonRegistry.getProcessId0 more robust

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This commit is contained in:
Jesse Glick
2022-03-22 09:30:46 -04:00
committed by Peter Palaga
parent 3b100839a8
commit 86d1c3661b
1 changed files with 20 additions and 10 deletions
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30
common/src/main/java/org/mvndaemon/mvnd/common/DaemonRegistry.java
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@@ -271,23 +271,33 @@ public class DaemonRegistry implements AutoCloseable {
private static final int PROCESS_ID = getProcessId0();
private static int getProcessId0() {
String pid = null;
try {
final Path self = Paths.get("/proc/self");
if (Files.exists(self)) {
pid = self.toRealPath().getFileName().toString();
String pid = self.toRealPath().getFileName().toString();
if (pid.equals("self")) {
LOGGER.debug("/proc/self symlink could not be followed");
} else {
LOGGER.debug("loading own PID from /proc/self link: {}", pid);
try {
return Integer.parseInt(pid);
} catch (NumberFormatException x) {
LOGGER.warn("Unable to determine PID from malformed /proc/self link `" + pid + "`");
}
}
}
} catch (IOException ignored) {
LOGGER.debug("could not load /proc/self", ignored);
}
if (pid == null) {
pid = ManagementFactory.getRuntimeMXBean().getName().split("@", 0)[0];
}
if (pid == null) {
int rpid = new Random().nextInt(1 << 16);
LOGGER.warn("Unable to determine PID, picked a random number=" + rpid);
return rpid;
} else {
String vmname = ManagementFactory.getRuntimeMXBean().getName();
String pid = vmname.split("@", 0)[0];
LOGGER.debug("loading own PID from VM name: {}", pid);
try {
return Integer.parseInt(pid);
} catch (NumberFormatException x) {
int rpid = new Random().nextInt(1 << 16);
LOGGER.warn("Unable to determine PID from malformed VM name `" + vmname + "`, picked a random number=" + rpid);
return rpid;
}
}