================
@@ -0,0 +1,70 @@
+#include <iostream>
+#include <mutex>
+#include <sys/wait.h>
+#include <thread>
+#include <unistd.h>
+#include <vector>
+
+pid_t g_pid = 0;
+std::mutex g_child_pids_mutex;
+std::vector<pid_t> g_child_pids;
+
+int call_vfork(int index) {
+  pid_t child_pid = vfork();
+
+  if (child_pid == -1) {
+    // Error handling
+    perror("vfork");
----------------
clayborg wrote:

```
perror(use_vfork ? "vfork" : "fork");
```

https://github.com/llvm/llvm-project/pull/81564
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