unix, windows: add uv_fs_event_getpath

include/uv.h

@@ -2035,6 +2035,15 @@ UV_EXTERN int uv_fs_event_start(uv_fs_event_t* handle,
 
 UV_EXTERN int uv_fs_event_stop(uv_fs_event_t* handle);
 
+/*
+ * Get the path befing monitored by the handle. The buffer must be preallocated
+ * by the user. Returns 0 on success or an error code < 0 in case of failure.
+ * On sucess, `buf` will contain the path and `len` its length.
+ */
+UV_EXTERN int uv_fs_event_getpath(uv_fs_event_t* handle,
+                                  char* buf,
+                                  size_t* len);
+
 
 /* Utility */
 

src/uv-common.c

@@ -444,3 +444,23 @@ int uv__getaddrinfo_translate_error(int sys_err) {
   abort();
   return 0;  /* Pacify compiler. */
 }
+
+int uv_fs_event_getpath(uv_fs_event_t* handle, char* buf, size_t* len) {
+  size_t required_len;
+
+  if (!uv__is_active(handle)) {
+    *len = 0;
+    return UV_EINVAL;
+  }
+
+  required_len = strlen(handle->path) + 1;
+  if (required_len > *len) {
+    *len = 0;
+    return UV_ENOBUFS;
+  }
+
+  memcpy(buf, handle->path, required_len);
+  *len = required_len;
+
+  return 0;
+}

test/test-fs-event.c

@@ -628,6 +628,38 @@ TEST_IMPL(fs_event_start_and_close) {
   return 0;
 }
 
+TEST_IMPL(fs_event_getpath) {
+  uv_loop_t* loop = uv_default_loop();
+  int r;
+  char buf[1024];
+  size_t len;
+
+  create_dir(loop, "watch_dir");
+
+  r = uv_fs_event_init(loop, &fs_event);
+  ASSERT(r == 0);
+  len = sizeof buf;
+  r = uv_fs_event_getpath(&fs_event, buf, &len);
+  ASSERT(r == UV_EINVAL);
+  r = uv_fs_event_start(&fs_event, fail_cb, "watch_dir", 0);
+  ASSERT(r == 0);
+  len = sizeof buf;
+  r = uv_fs_event_getpath(&fs_event, buf, &len);
+  ASSERT(r == 0);
+  ASSERT(memcmp(buf, "watch_dir", len) == 0);
+  r = uv_fs_event_stop(&fs_event);
+  ASSERT(r == 0);
+  uv_close((uv_handle_t*) &fs_event, close_cb);
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  ASSERT(close_cb_called == 1);
+
+  remove("watch_dir/");
+  MAKE_VALGRIND_HAPPY();
+  return 0;
+}
+
 #if defined(__APPLE__)
 
 static int fs_event_error_reported;

test/test-list.h

@@ -207,6 +207,7 @@ TEST_DECLARE   (fs_event_close_with_pending_event)
 TEST_DECLARE   (fs_event_close_in_callback)
 TEST_DECLARE   (fs_event_start_and_close)
 TEST_DECLARE   (fs_event_error_reporting)
+TEST_DECLARE   (fs_event_getpath)
 TEST_DECLARE   (fs_readdir_empty_dir)
 TEST_DECLARE   (fs_readdir_file)
 TEST_DECLARE   (fs_open_dir)
@@ -527,6 +528,7 @@ TASK_LIST_START
   TEST_ENTRY  (fs_event_close_in_callback)
   TEST_ENTRY  (fs_event_start_and_close)
   TEST_ENTRY  (fs_event_error_reporting)
+  TEST_ENTRY  (fs_event_getpath)
   TEST_ENTRY  (fs_readdir_empty_dir)
   TEST_ENTRY  (fs_readdir_file)
   TEST_ENTRY  (fs_open_dir)