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@@ -0,0 +1,121 @@
+
+.. _request:
+
+:c:type:`uv_req_t` --- Base request
+===================================
+
+`uv_req_t` is the base type for all libuv request types.
+
+Structures are aligned so that any libuv request can be cast to `uv_req_t`.
+All API functions defined here work with any request type.
+
+
+Data types
+----------
+
+.. c:type:: uv_req_t
+
+    The base libuv request structure.
+
+.. c:type:: uv_any_req
+
+    Union of all request types.
+
+.. c:enum:: uv_req_type
+
+    The kind of the libuv request.
+
+    ::
+
+        typedef enum {
+            UV_UNKNOWN_REQ = 0,
+            UV_REQ,
+            UV_CONNECT,
+            UV_WRITE,
+            UV_SHUTDOWN,
+            UV_UDP_SEND,
+            UV_FS,
+            UV_WORK,
+            UV_GETADDRINFO,
+            UV_GETNAMEINFO,
+            UV_REQ_TYPE_MAX,
+        } uv_req_type;
+
+
+Public members
+^^^^^^^^^^^^^^
+
+.. c:member:: void* uv_req_t.data
+
+    Space for user-defined arbitrary data. libuv does not use this field.
+
+.. c:member:: uv_req_type uv_req_t.type
+
+    The :c:enum:`uv_req_type`, indicating the type of the request. Readonly.
+
+
+API
+---
+
+.. c:macro:: UV_REQ_TYPE_MAP(iter_macro)
+
+    Macro that expands to a series of invocations of `iter_macro` for
+    each of the request types. `iter_macro` is invoked with two
+    arguments: the name of the `uv_req_type` element without the `UV_`
+    prefix, and the name of the corresponding structure type without the
+    `uv_` prefix and `_t` suffix.
+
+.. c:function:: int uv_cancel(uv_req_t* req)
+
+    Cancel a pending request. Fails if the request is executing or has finished
+    executing.
+
+    Returns 0 on success, or an error code < 0 on failure.
+
+    Only cancellation of :c:type:`uv_fs_t`, :c:type:`uv_getaddrinfo_t`,
+    :c:type:`uv_getnameinfo_t`, :c:type:`uv_random_t` and :c:type:`uv_work_t`
+    requests is currently supported.
+
+    Cancelled requests have their callbacks invoked some time in the future.
+    It's **not** safe to free the memory associated with the request until the
+    callback is called.
+
+    Here is how cancellation is reported to the callback:
+
+    * A :c:type:`uv_fs_t` request has its req->result field set to `UV_ECANCELED`.
+
+    * A :c:type:`uv_work_t`, :c:type:`uv_getaddrinfo_t`,
+      :c:type:`uv_getnameinfo_t` or :c:type:`uv_random_t` request has its
+      callback invoked with status == `UV_ECANCELED`.
+
+.. c:function:: size_t uv_req_size(uv_req_type type)
+
+    Returns the size of the given request type. Useful for FFI binding writers
+    who don't want to know the structure layout.
+
+.. c:function:: void* uv_req_get_data(const uv_req_t* req)
+
+    Returns `req->data`.
+
+    .. versionadded:: 1.19.0
+
+.. c:function:: void uv_req_set_data(uv_req_t* req, void* data)
+
+    Sets `req->data` to `data`.
+
+    .. versionadded:: 1.19.0
+
+.. c:function:: uv_req_type uv_req_get_type(const uv_req_t* req)
+
+    Returns `req->type`.
+
+    .. versionadded:: 1.19.0
+
+.. c:function:: const char* uv_req_type_name(uv_req_type type)
+
+    Returns the name for the equivalent struct for a given request type,
+    e.g. `"connect"` (as in :c:type:`uv_connect_t`) for `UV_CONNECT`.
+
+    If no such request type exists, this returns `NULL`.
+
+    .. versionadded:: 1.19.0