Merge remote-tracking branches 'public/decouple_lost_owner' and 'public/decouple_signals'
This commit is contained in:
commit
d07fe5dffe
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@ -0,0 +1,4 @@
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o Code simplification and refactoring:
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- Treat the loss of an owning controller as equivalent to a SIGTERM
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signal. This removes a tiny amount of duplicated code, and simplifies
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our callgraph. Closes ticekt 16788.
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@ -1325,7 +1325,7 @@ handle_control_signal(control_connection_t *conn, uint32_t len,
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if (sig == SIGTERM || sig == SIGINT)
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connection_flush(TO_CONN(conn));
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process_signal(sig);
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activate_signal(sig);
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return 0;
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}
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@ -3932,10 +3932,6 @@ connection_control_reached_eof(control_connection_t *conn)
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return 0;
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}
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static void lost_owning_controller(const char *owner_type,
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const char *loss_manner)
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ATTR_NORETURN;
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/** Shut down this Tor instance in the same way that SIGINT would, but
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* with a log message appropriate for the loss of an owning controller. */
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static void
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@ -3944,10 +3940,7 @@ lost_owning_controller(const char *owner_type, const char *loss_manner)
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log_notice(LD_CONTROL, "Owning controller %s has %s -- exiting now.",
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owner_type, loss_manner);
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/* XXXX Perhaps this chunk of code should be a separate function,
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* called here and by process_signal(SIGINT). */
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tor_cleanup();
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exit(0);
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activate_signal(SIGTERM);
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}
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/** Called when <b>conn</b> is being freed. */
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@ -5552,8 +5545,6 @@ static char *owning_controller_process_spec = NULL;
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* if this Tor instance is not currently owned by a process. */
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static tor_process_monitor_t *owning_controller_process_monitor = NULL;
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static void owning_controller_procmon_cb(void *unused) ATTR_NORETURN;
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/** Process-termination monitor callback for Tor's owning controller
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* process. */
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static void
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107
src/or/main.c
107
src/or/main.c
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@ -100,6 +100,7 @@ static int conn_close_if_marked(int i);
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static void connection_start_reading_from_linked_conn(connection_t *conn);
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static int connection_should_read_from_linked_conn(connection_t *conn);
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static int run_main_loop_until_done(void);
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static void process_signal(int sig);
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/********* START VARIABLES **********/
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@ -2260,11 +2261,10 @@ run_main_loop_until_done(void)
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return loop_result;
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}
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#ifndef _WIN32 /* Only called when we're willing to use signals */
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/** Libevent callback: invoked when we get a signal.
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*/
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static void
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signal_callback(int fd, short events, void *arg)
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signal_callback(evutil_socket_t fd, short events, void *arg)
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{
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const int *sigptr = arg;
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const int sig = *sigptr;
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@ -2273,10 +2273,9 @@ signal_callback(int fd, short events, void *arg)
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process_signal(sig);
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}
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#endif
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/** Do the work of acting on a signal received in <b>sig</b> */
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void
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static void
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process_signal(int sig)
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{
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switch (sig)
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@ -2501,36 +2500,73 @@ exit_function(void)
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#endif
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}
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/** Set up the signal handlers for either parent or child. */
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#ifdef _WIN32
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#define UNIX_ONLY 0
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#else
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#define UNIX_ONLY 1
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#endif
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static struct {
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int signal_value;
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int try_to_register;
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struct event *signal_event;
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} signal_handlers[] = {
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#ifdef SIGINT
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{ SIGINT, UNIX_ONLY, NULL }, /* do a controlled slow shutdown */
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#endif
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#ifdef SIGTERM
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{ SIGTERM, UNIX_ONLY, NULL }, /* to terminate now */
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#endif
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#ifdef SIGPIPE
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{ SIGPIPE, UNIX_ONLY, NULL }, /* otherwise SIGPIPE kills us */
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#endif
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#ifdef SIGUSR1
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{ SIGUSR1, UNIX_ONLY, NULL }, /* dump stats */
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#endif
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#ifdef SIGUSR2
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{ SIGUSR2, UNIX_ONLY, NULL }, /* go to loglevel debug */
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#endif
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#ifdef SIGHUP
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{ SIGHUP, UNIX_ONLY, NULL }, /* to reload config, retry conns, etc */
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#endif
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#ifdef SIGXFSZ
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{ SIGXFSZ, UNIX_ONLY, NULL }, /* handle file-too-big resource exhaustion */
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#endif
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#ifdef SIGCHLD
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{ SIGCHLD, UNIX_ONLY, NULL }, /* handle dns/cpu workers that exit */
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#endif
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/* These are controller-only */
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{ SIGNEWNYM, 0, NULL },
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{ SIGCLEARDNSCACHE, 0, NULL },
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{ SIGHEARTBEAT, 0, NULL },
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{ -1, -1, NULL }
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};
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/** Set up the signal handlers for either parent or child process */
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void
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handle_signals(int is_parent)
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{
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#ifndef _WIN32 /* do signal stuff only on Unix */
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int i;
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static const int signals[] = {
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SIGINT, /* do a controlled slow shutdown */
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SIGTERM, /* to terminate now */
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SIGPIPE, /* otherwise SIGPIPE kills us */
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SIGUSR1, /* dump stats */
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SIGUSR2, /* go to loglevel debug */
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SIGHUP, /* to reload config, retry conns, etc */
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#ifdef SIGXFSZ
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SIGXFSZ, /* handle file-too-big resource exhaustion */
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#endif
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SIGCHLD, /* handle dns/cpu workers that exit */
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-1 };
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static struct event *signal_events[16]; /* bigger than it has to be. */
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if (is_parent) {
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for (i = 0; signals[i] >= 0; ++i) {
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signal_events[i] = tor_evsignal_new(tor_libevent_get_base(), signals[i],
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signal_callback,
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/* Cast away const */
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(int*)&signals[i]);
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if (event_add(signal_events[i], NULL))
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log_warn(LD_BUG, "Error from libevent when adding event for signal %d",
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signals[i]);
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for (i = 0; signal_handlers[i].signal_value >= 0; ++i) {
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if (signal_handlers[i].try_to_register) {
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signal_handlers[i].signal_event =
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tor_evsignal_new(tor_libevent_get_base(),
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signal_handlers[i].signal_value,
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signal_callback,
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&signal_handlers[i].signal_value);
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if (event_add(signal_handlers[i].signal_event, NULL))
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log_warn(LD_BUG, "Error from libevent when adding "
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"event for signal %d",
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signal_handlers[i].signal_value);
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} else {
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signal_handlers[i].signal_event =
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tor_event_new(tor_libevent_get_base(), -1,
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EV_SIGNAL, signal_callback,
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&signal_handlers[i].signal_value);
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}
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}
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} else {
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#ifndef _WIN32
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struct sigaction action;
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action.sa_flags = 0;
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sigemptyset(&action.sa_mask);
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sigaction(SIGHUP, &action, NULL);
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#ifdef SIGXFSZ
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sigaction(SIGXFSZ, &action, NULL);
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#endif
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#endif
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}
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#else /* MS windows */
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(void)is_parent;
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#endif /* signal stuff */
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}
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/* Make sure the signal handler for signal_num will be called. */
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void
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activate_signal(int signal_num)
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{
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int i;
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for (i = 0; signal_handlers[i].signal_value >= 0; ++i) {
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if (signal_handlers[i].signal_value == signal_num) {
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event_active(signal_handlers[i].signal_event, EV_SIGNAL, 1);
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return;
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}
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}
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}
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/** Main entry point for the Tor command-line client.
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@ -61,7 +61,7 @@ MOCK_DECL(long,get_uptime,(void));
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unsigned get_signewnym_epoch(void);
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void handle_signals(int is_parent);
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void process_signal(int sig);
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void activate_signal(int signal_num);
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int try_locking(const or_options_t *options, int err_if_locked);
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int have_lockfile(void);
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