Merge "Minor changes to the async DNS query API flag definitions." am: 9a22123a

#if __ANDROID_API__ >= 29

/**

 * Possible values of the flags argument to android_res_nsend and android_res_nquery.

 * Values are ORed together.

 */

enum ResNsendFlags : uint32_t {

    // Send a single request to a single resolver and fail on timeout or network errors

    /**

     * Send a single request to a single resolver and fail on timeout or network errors

     */

    ANDROID_RESOLV_NO_RETRY = 1 << 0,

    // Do not cache the result of the lookup. The lookup may return a result that is already

    // in the cache, unless the ANDROID_RESOLV_NO_CACHE_LOOKUP flag is also specified.

    /**

     * Do not cache the result of the lookup. The lookup may return a result that is already

     * in the cache, unless the ANDROID_RESOLV_NO_CACHE_LOOKUP flag is also specified.

     */

    ANDROID_RESOLV_NO_CACHE_STORE = 1 << 1,

    // Don't lookup the request in cache, do not write back the response into the cache

    /**

     * Don't lookup the request in cache.

     */

    ANDROID_RESOLV_NO_CACHE_LOOKUP = 1 << 2,

};

 * POSIX error code (see errno.h) if an immediate error occurs.

 */

int android_res_nquery(net_handle_t network,

        const char *dname, int ns_class, int ns_type,

        enum ResNsendFlags flags) __INTRODUCED_IN(29);

        const char *dname, int ns_class, int ns_type, uint32_t flags) __INTRODUCED_IN(29);

/**

 * Issue the query |msg| on the given |network|.

 * POSIX error code (see errno.h) if an immediate error occurs.

 */

int android_res_nsend(net_handle_t network,

        const uint8_t *msg, size_t msglen, enum ResNsendFlags flags) __INTRODUCED_IN(29);

        const uint8_t *msg, size_t msglen, uint32_t flags) __INTRODUCED_IN(29);

/**

 * Read a result for the query associated with the |fd| descriptor.

 * Closes |fd| before returning.

 *

 * Returns:

 *     < 0: negative POSIX error code (see errno.h for possible values). |rcode| is not set.