void
mono_threads_posix_init_signals (MonoThreadPosixInitSignals signals)
{
sigset_t signal_set;
g_assert ((signals == MONO_THREADS_POSIX_INIT_SIGNALS_SUSPEND_RESTART) ^ (signals == MONO_THREADS_POSIX_INIT_SIGNALS_ABORT));
sigemptyset (&signal_set);
switch (signals) {
case MONO_THREADS_POSIX_INIT_SIGNALS_SUSPEND_RESTART: {
if (mono_thread_info_unified_management_enabled ()) {
suspend_signal_num = DEFAULT_SUSPEND_SIGNAL;
restart_signal_num = DEFAULT_RESTART_SIGNAL;
} else {
suspend_signal_num = suspend_signal_get ();
restart_signal_num = restart_signal_get ();
}
sigfillset (&suspend_signal_mask);
sigdelset (&suspend_signal_mask, restart_signal_num);
if (!mono_thread_info_unified_management_enabled ())
sigdelset (&suspend_signal_mask, mono_gc_get_suspend_signal ());
sigemptyset (&suspend_ack_signal_mask);
sigaddset (&suspend_ack_signal_mask, restart_signal_num);
signal_add_handler (suspend_signal_num, suspend_signal_handler, SA_RESTART);
signal_add_handler (restart_signal_num, restart_signal_handler, SA_RESTART);
sigaddset (&signal_set, suspend_signal_num);
sigaddset (&signal_set, restart_signal_num);
break;
}
case MONO_THREADS_POSIX_INIT_SIGNALS_ABORT: {
abort_signal_num = abort_signal_get ();
signal_add_handler (abort_signal_num, abort_signal_handler, 0);
sigaddset (&signal_set, abort_signal_num);
break;
}
default: g_assert_not_reached ();
}
/* ensure all the new signals are unblocked */
sigprocmask (SIG_UNBLOCK, &signal_set, NULL);
}
void
mono_threads_suspend_init_signals (void)
{
sigset_t signal_set;
sigemptyset (&signal_set);
/* add suspend signal */
suspend_signal_num = suspend_signal_get ();
signal_add_handler (suspend_signal_num, suspend_signal_handler, SA_RESTART);
sigaddset (&signal_set, suspend_signal_num);
/* add restart signal */
restart_signal_num = restart_signal_get ();
sigfillset (&suspend_signal_mask);
sigdelset (&suspend_signal_mask, restart_signal_num);
sigemptyset (&suspend_ack_signal_mask);
sigaddset (&suspend_ack_signal_mask, restart_signal_num);
signal_add_handler (restart_signal_num, restart_signal_handler, SA_RESTART);
sigaddset (&signal_set, restart_signal_num);
/* add abort signal */
abort_signal_num = abort_signal_get ();
/* the difference between abort and suspend here is made by not
* passing SA_RESTART, meaning we won't restart the syscall when
* receiving a signal */
signal_add_handler (abort_signal_num, suspend_signal_handler, 0);
sigaddset (&signal_set, abort_signal_num);
/* ensure all the new signals are unblocked */
sigprocmask (SIG_UNBLOCK, &signal_set, NULL);
/*
On 32bits arm Android, signals with values >=32 are not usable as their headers ship a broken sigset_t.
See 5005c6f3fbc1da584c6a550281689cc23f59fe6d for more details.
*/
#ifdef HOST_ANDROID
g_assert (suspend_signal_num < 32);
g_assert (restart_signal_num < 32);
g_assert (abort_signal_num < 32);
#endif
}
