reloop

tools/diag.c

@@ -0,0 +1,63 @@
+// #include "monitor_user.h"
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#define DEVICE "/dev/variable_monitor"
+int file_desc = -1;
+
+pid_t pid = 0;
+
+/// @brief start watch
+/// @param w_arg
+/// @return 0 means success, other means fail
+int start_watch() {
+  if (file_desc < 0) {
+    file_desc = open(DEVICE, 0);
+  }
+  if (file_desc < 0) {
+    printf("Can't open device file: %s\n", DEVICE);
+    return -1;
+  }
+
+  printf("1 \n");
+
+  if (ioctl(file_desc, 2, &pid) < 0) {
+    printf("ioctl failed\n");
+    close(file_desc);
+    return -1;
+  }
+
+  printf("2 \n");
+  return 0;
+}
+
+/// @brief cancel watch
+/// @return 0 means success, other means fail
+int cancel_watch() {
+  if (file_desc < 0) {
+    file_desc = open(DEVICE, 0);
+  }
+  if (file_desc < 0) {
+    printf("Device not open: %s,%d \n", DEVICE, file_desc);
+    return file_desc;
+  }
+
+  close(file_desc);
+  file_desc = -1;
+  return 0;
+}
+
+int main(int argc, char **argv){
+    if (argc != 2)
+		printf("USAGE: unwind-pid <pid>\n");
+
+	pid = atoi(argv[1]);
+
+    printf("%d \n", pid);
+
+    start_watch();
+    cancel_watch();
+}

tools/diag.py

@@ -0,0 +1,53 @@
+DEVICE = "/dev/variable_monitor"
+import os, sys
+import ctypes
+from ctypes import *
+import fcntl
+
+file_desc = None
+
+
+def open_device():
+    global file_desc
+    if file_desc is None:
+        try:
+            file_desc = os.open(DEVICE, os.O_RDWR)
+        except OSError:
+            print(f"Can't open device file: {DEVICE}")
+            return -1
+    return 0
+
+
+def close_device():
+    global file_desc
+    if file_desc is None:
+        print(f"Device not open: {DEVICE}, {file_desc}")
+        return file_desc
+
+    os.close(file_desc)
+    file_desc = None
+    return 0
+
+
+class ioctl_pid(Structure):
+    _fields_ = [
+        ("pid", c_int),
+    ]
+
+
+def ioctl(pid: int):
+    pidc = ioctl_pid(
+        pid=c_int(pid),
+    )
+    ret = fcntl.ioctl(file_desc, 0, pidc)
+    if ret == 0:
+        print("success")
+
+
+pid = int(sys.argv[1])
+
+open_device()
+
+ioctl(pid)
+
+close_device()