diff options
| -rw-r--r-- | erts/doc/src/erl.xml | 19 | ||||
| -rw-r--r-- | erts/emulator/sys/unix/sys.c | 40 |
2 files changed, 59 insertions, 0 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml index f2a55f6298..8da832ac37 100644 --- a/erts/doc/src/erl.xml +++ b/erts/doc/src/erl.xml @@ -1595,6 +1595,25 @@ </section> <section> + <marker id="signals"></marker> + <title>Signals</title> + <p>On Unix systems, the Erlang runtime will interpret two types of signals.</p> + <taglist> + <tag><c>SIGUSR1</c></tag> + <item> + <p>A <c>SIGUSR1</c> signal forces a crash dump.</p> + </item> + <tag><c>SIGTERM</c></tag> + <item> + <p>A <c>SIGTERM</c> will produce a <c>stop</c> message to the <c>init</c> process. + This is equivalent to a <c>init:stop/0</c> call.</p> + <p>Introduced in ERTS 8.3 (Erlang/OTP 19.3)</p> + </item> + </taglist> + <p>The signal <c>SIGUSR2</c> is reserved for internal usage. No other signals are handled.</p> + </section> + + <section> <marker id="configuration"></marker> <title>Configuration</title> <p>The standard Erlang/OTP system can be reconfigured to change the default diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c index 4b2edace0a..2fc802a2c6 100644 --- a/erts/emulator/sys/unix/sys.c +++ b/erts/emulator/sys/unix/sys.c @@ -407,6 +407,7 @@ erts_sys_pre_init(void) #ifdef ERTS_THR_HAVE_SIG_FUNCS sigemptyset(&thr_create_sigmask); sigaddset(&thr_create_sigmask, SIGINT); /* block interrupt */ + sigaddset(&thr_create_sigmask, SIGTERM); /* block terminate signal */ sigaddset(&thr_create_sigmask, SIGUSR1); /* block user defined signal */ #endif @@ -655,6 +656,40 @@ static RETSIGTYPE request_break(int signum) #endif } +static void stop_requested(void) { + Process* p = NULL; + Eterm msg, *hp; + ErtsProcLocks locks = 0; + ErlOffHeap *ohp; + Eterm id = erts_whereis_name_to_id(NULL, am_init); + + if ((p = (erts_pid2proc_opt(NULL, 0, id, 0, ERTS_P2P_FLG_INC_REFC))) != NULL) { + ErtsMessage *msgp = erts_alloc_message_heap(p, &locks, 3, &hp, &ohp); + + /* init ! {stop,stop} */ + msg = TUPLE2(hp, am_stop, am_stop); + erts_queue_message(p, locks, msgp, msg, am_system); + + if (locks) + erts_smp_proc_unlock(p, locks); + erts_proc_dec_refc(p); + } +} + +#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL)) +static RETSIGTYPE request_stop(void) +#else +static RETSIGTYPE request_stop(int signum) +#endif +{ +#ifdef ERTS_SMP + smp_sig_notify('S'); +#else + stop_requested(); +#endif +} + + static ERTS_INLINE void sigusr1_exit(void) { @@ -751,6 +786,7 @@ static RETSIGTYPE do_quit(int signum) /* Disable break */ void erts_set_ignore_break(void) { sys_signal(SIGINT, SIG_IGN); + sys_signal(SIGTERM, SIG_IGN); sys_signal(SIGQUIT, SIG_IGN); sys_signal(SIGTSTP, SIG_IGN); } @@ -776,6 +812,7 @@ void erts_replace_intr(void) { void init_break_handler(void) { sys_signal(SIGINT, request_break); + sys_signal(SIGTERM, request_stop); #ifndef ETHR_UNUSABLE_SIGUSRX sys_signal(SIGUSR1, user_signal1); #endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */ @@ -1289,6 +1326,9 @@ signal_dispatcher_thread_func(void *unused) switch (buf[i]) { case 0: /* Emulator initialized */ break; + case 'S': /* SIGTERM */ + stop_requested(); + break; case 'I': /* SIGINT */ break_requested(); break; |