[lldb] Use file-based synchronization in TestVSCode_attach

The is the best method we have at the moment for attach-style tests.

1 files changed, 15 insertions, 6 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/attach/main.c b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/attach/main.c
index 4f50f754615..64d86583ada 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/attach/main.c
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/attach/main.c
@@ -1,11 +1,20 @@
 #include <stdio.h>
 #include <unistd.h>
 
-int main(int argc, char const *argv[])
-{
-    lldb_enable_attach();
+int main(int argc, char const *argv[]) {
+  lldb_enable_attach();
 
-    printf("pid = %i\n", getpid());
-    sleep(10);
-    return 0; // breakpoint 1
+  if (argc >= 2) {
+    // Create the synchronization token.
+    FILE *f = fopen(argv[1], "wx");
+    if (!f)
+      return 1;
+    fputs("\n", f);
+    fflush(f);
+    fclose(f);
+  }
+
+  printf("pid = %i\n", getpid());
+  sleep(10);
+  return 0; // breakpoint 1
 }