[Lldb-commits] [lldb] [lldb/linux] Make sure the process continues running after a detach (PR #88494)

[Pavel Labath via lldb-commits]

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@@ -0,0 +1,48 @@
+#include "pseudo_barrier.h"
+#include <chrono>
+#include <fcntl.h>
+#include <fstream>
+#include <stdio.h>
+#include <thread>
+#include <vector>
+
+pseudo_barrier_t barrier;
+
+constexpr size_t nthreads = 5;
+volatile bool wait_for_debugger_flag = true;
+
+void break_here() {}
+
+void tfunc() {
+  pseudo_barrier_wait(barrier);
+
+  break_here();
+}
+
+int main(int argc, char const *argv[]) {
+  lldb_enable_attach();
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labath wrote:

Yes, but it's not really a "special" OS. Most linux systems are configured like that by default, where you're only allowed to debug your own children (unless they explicitly allow that, or you're root, etc.). Check out https://www.kernel.org/doc/html/v4.15/admin-guide/LSM/Yama.html. lldb_enable_attach is our own invention, which calls the appropriate os interface to enable attaching if necessary. Currently, it's only implemented on linux.

https://github.com/llvm/llvm-project/pull/88494