From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:54:28 +0200 Subject: Adding upstream version 18.2.2. Signed-off-by: Daniel Baumann --- src/c-ares/ares_fds.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 src/c-ares/ares_fds.c (limited to 'src/c-ares/ares_fds.c') diff --git a/src/c-ares/ares_fds.c b/src/c-ares/ares_fds.c new file mode 100644 index 000000000..f405fc047 --- /dev/null +++ b/src/c-ares/ares_fds.c @@ -0,0 +1,59 @@ + +/* Copyright 1998 by the Massachusetts Institute of Technology. + * + * Permission to use, copy, modify, and distribute this + * software and its documentation for any purpose and without + * fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting + * documentation, and that the name of M.I.T. not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" + * without express or implied warranty. + */ + +#include "ares_setup.h" + +#include "ares.h" +#include "ares_nowarn.h" +#include "ares_private.h" + +int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds) +{ + struct server_state *server; + ares_socket_t nfds; + int i; + + /* Are there any active queries? */ + int active_queries = !ares__is_list_empty(&(channel->all_queries)); + + nfds = 0; + for (i = 0; i < channel->nservers; i++) + { + server = &channel->servers[i]; + /* We only need to register interest in UDP sockets if we have + * outstanding queries. + */ + if (active_queries && server->udp_socket != ARES_SOCKET_BAD) + { + FD_SET(server->udp_socket, read_fds); + if (server->udp_socket >= nfds) + nfds = server->udp_socket + 1; + } + /* We always register for TCP events, because we want to know + * when the other side closes the connection, so we don't waste + * time trying to use a broken connection. + */ + if (server->tcp_socket != ARES_SOCKET_BAD) + { + FD_SET(server->tcp_socket, read_fds); + if (server->qhead) + FD_SET(server->tcp_socket, write_fds); + if (server->tcp_socket >= nfds) + nfds = server->tcp_socket + 1; + } + } + return (int)nfds; +} -- cgit v1.2.3