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.. _dns:
DNS utility functions
=====================
libuv provides asynchronous variants of `getaddrinfo` and `getnameinfo`.
Data types
----------
.. c:type:: uv_getaddrinfo_t
`getaddrinfo` request type.
.. c:type:: void (*uv_getaddrinfo_cb)(uv_getaddrinfo_t* req, int status, struct addrinfo* res)
Callback which will be called with the getaddrinfo request result once
complete. In case it was cancelled, `status` will have a value of
``UV_ECANCELED``.
.. c:type:: uv_getnameinfo_t
`getnameinfo` request type.
.. c:type:: void (*uv_getnameinfo_cb)(uv_getnameinfo_t* req, int status, const char* hostname, const char* service)
Callback which will be called with the getnameinfo request result once
complete. In case it was cancelled, `status` will have a value of
``UV_ECANCELED``.
Public members
^^^^^^^^^^^^^^
.. c:member:: uv_loop_t* uv_getaddrinfo_t.loop
Loop that started this getaddrinfo request and where completion will be
reported. Readonly.
.. c:member:: struct addrinfo* uv_getaddrinfo_t.addrinfo
Pointer to a `struct addrinfo` containing the result. Must be freed by the user
with :c:func:`uv_freeaddrinfo`.
.. versionchanged:: 1.3.0 the field is declared as public.
.. c:member:: uv_loop_t* uv_getnameinfo_t.loop
Loop that started this getnameinfo request and where completion will be
reported. Readonly.
.. seealso:: The :c:type:`uv_req_t` members also apply.
API
---
.. c:function:: int uv_getaddrinfo(uv_loop_t* loop, uv_getaddrinfo_t* req, uv_getaddrinfo_cb getaddrinfo_cb, const char* node, const char* service, const struct addrinfo* hints)
Asynchronous ``getaddrinfo(3)``.
Either node or service may be NULL but not both.
`hints` is a pointer to a struct addrinfo with additional address type
constraints, or NULL. Consult `man -s 3 getaddrinfo` for more details.
Returns 0 on success or an error code < 0 on failure. If successful, the
callback will get called sometime in the future with the lookup result,
which is either:
* status == 0, the res argument points to a valid `struct addrinfo`, or
* status < 0, the res argument is NULL. See the UV_EAI_* constants.
Call :c:func:`uv_freeaddrinfo` to free the addrinfo structure.
.. versionchanged:: 1.3.0 the callback parameter is now allowed to be NULL,
in which case the request will run **synchronously**.
.. c:function:: void uv_freeaddrinfo(struct addrinfo* ai)
Free the struct addrinfo. Passing NULL is allowed and is a no-op.
.. c:function:: int uv_getnameinfo(uv_loop_t* loop, uv_getnameinfo_t* req, uv_getnameinfo_cb getnameinfo_cb, const struct sockaddr* addr, int flags)
Asynchronous ``getnameinfo(3)``.
Returns 0 on success or an error code < 0 on failure. If successful, the
callback will get called sometime in the future with the lookup result.
Consult `man -s 3 getnameinfo` for more details.
.. versionchanged:: 1.3.0 the callback parameter is now allowed to be NULL,
in which case the request will run **synchronously**.
.. seealso:: The :c:type:`uv_req_t` API functions also apply.
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