[Lldb-commits] [lldb] [lldb] Have lldb-server assign ports to children in platform mode (PR #88845)

[David Spickett via lldb-commits]

================
@@ -301,13 +294,35 @@ int main_platform(int argc, char *argv[]) {
       exit(socket_error);
     }
     printf("Connection established.\n");
+
     if (g_server) {
       // Collect child zombie processes.
 #if !defined(_WIN32)
-      while (waitpid(-1, nullptr, WNOHANG) > 0)
-        ;
+      ::pid_t waitResult;
+      while ((waitResult = waitpid(-1, nullptr, WNOHANG)) > 0) {
+        // waitResult is the child pid
+        gdbserver_portmap.FreePortForProcess(waitResult);
+      }
 #endif
-      if (fork()) {
+      // TODO: Clean up portmap for Windows when children die
+
+      // After collecting zombie ports, get the next available
+      GDBRemoteCommunicationServerPlatform::PortMap portmap_for_child;
+      llvm::Expected<uint16_t> available_port =
+          gdbserver_portmap.GetNextAvailablePort();
+      if (available_port)
+        portmap_for_child.AllowPort(*available_port);
+      else {
+        fprintf(stderr,
+                "no available gdbserver port for connection - dropping...\n");
----------------
DavidSpickett wrote:

The else path needs to consume the error from llvm::Expected<uint16_t> 
otherwise when the Expected destructs we'll get an assertion failure.

https://github.com/llvm/llvm-project/pull/88845
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