server: Exit cleanly on SIGINT/SIGTERM.

[paraslash.git] / udp_send.c

diff --git a/udp_send.c b/udp_send.c
index 0ea95e41993c0c3442ff0fc219c2111f73e5e0f1..52947b20610a6b26280755cf0ddb5125ac5ae8a2 100644 (file)
--- a/udp_send.c
+++ b/udp_send.c
@@ -1,8 +1,4 @@
-/*
- * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
 
 /** \file udp_send.c Para_server's udp sender. */
 
@@ -76,8 +72,11 @@ static void udp_delete_target(struct sender_client *sc, const char *msg)
 
        PARA_NOTICE_LOG("deleting %s (%s) from list\n", sc->name, msg);
        udp_close_target(sc);
-       close(sc->fd);
-       del_close_on_fork_list(sc->fd);
+       /* command handlers already called close_listed_fds() */
+       if (!process_is_command_handler()) {
+               close(sc->fd);
+               del_close_on_fork_list(sc->fd);
+       }
        vss_del_fec_client(ut->fc);
        list_del(&sc->node);
        free(sc->name);
@@ -168,6 +167,13 @@ static void udp_shutdown_targets(void)
                udp_close_target(sc);
 }
 
+static void udp_shutdown(void)
+{
+       struct sender_client *sc, *tmp;
+       list_for_each_entry_safe(sc, tmp, &targets, node)
+               udp_delete_target(sc, "shutdown");
+}
+
 static int udp_resolve_target(const char *url, struct sender_command_data *scd)
 {
        const char *result;
@@ -416,32 +422,38 @@ static char *udp_help(void)
        );
 }
 
-/**
- * The init function of para_server's udp sender.
- *
- * \param s Pointer to the udp sender struct.
- *
- * It initializes all function pointers of \a s and the list of udp targets.
- */
-void udp_send_init(struct sender *s)
+/* Initialize the list of udp targets. */
+static void udp_send_init(void)
 {
        INIT_LIST_HEAD(&targets);
-       s->status = udp_status;
-       s->help = udp_help;
-       s->send = NULL;
-       s->pre_select = NULL;
-       s->post_select = NULL;
-       s->shutdown_clients = udp_shutdown_targets;
-       s->resolve_target = udp_resolve_target;
-       s->client_cmds[SENDER_on] = udp_com_on;
-       s->client_cmds[SENDER_off] = udp_com_off;
-       s->client_cmds[SENDER_deny] = NULL;
-       s->client_cmds[SENDER_allow] = NULL;
-       s->client_cmds[SENDER_add] = udp_com_add;
-       s->client_cmds[SENDER_delete] = udp_com_delete;
        sender_status = SENDER_off;
        udp_init_target_list();
        if (!OPT_GIVEN(UDP_NO_AUTOSTART))
                sender_status = SENDER_on;
        PARA_DEBUG_LOG("udp sender init complete\n");
 }
+
+/**
+ * The UDP sender.
+ *
+ * In contrast to the other senders the UDP sender is active in the sense that
+ * it initiates the network connection according to its list of targets rather
+ * than passively waiting for clients to connect. Like DCCP streams, UDP
+ * streams are always sent FEC-encoded. The UDP sender is the only sender which
+ * supports IP multicasting.
+ */
+const struct sender udp_sender = {
+       .name = "udp",
+       .init = udp_send_init,
+       .shutdown = udp_shutdown,
+       .shutdown_clients = udp_shutdown_targets,
+       .resolve_target = udp_resolve_target,
+       .client_cmds = {
+               [SENDER_on] = udp_com_on,
+               [SENDER_off] = udp_com_off,
+               [SENDER_add] = udp_com_add,
+               [SENDER_delete] = udp_com_delete,
+       },
+       .help = udp_help,
+       .status = udp_status,
+};