Import LinuxCNC source tree

tests/ui-smoke/_lib/cleanup-runtime.sh

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+#!/bin/bash
+# Reset linuxcnc-related runtime state so the next ui-smoke test starts
+# from a clean environment. Used as both a pre-launch belt-and-braces
+# cleanup and as a post-shutdown last-resort if scripts/linuxcnc's own
+# SIGTERM trap could not reap everything in time.
+#
+# SHM_KEYS mirrors SHMEM_KEY in scripts/runtests:157. If a ui-smoke
+# crash leaks any of these, the next runtests invocation aborts in
+# test_shmem(); we must clean the full set.
+
+set -u
+
+DAEMONS=(linuxcncsvr milltask halui rtapi_app)
+SHM_KEYS=(0x00000064 0x48414c32 0x48484c34 0x90280a48 0x130cf406 0x434c522b)
+
+for proc in "${DAEMONS[@]}"; do
+    pkill -KILL -x "$proc" 2>/dev/null || true
+done
+
+rm -f /tmp/linuxcnc.lock
+halrun -U 2>/dev/null || true
+
+for key in "${SHM_KEYS[@]}"; do
+    shmid=$(LC_ALL=C ipcs -m | awk -v k="$key" 'tolower($1)==k {print $2}')
+    if [ -n "$shmid" ]; then
+        ipcrm -m "$shmid" 2>/dev/null || true
+    fi
+done
+
+exit 0