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bsd-user/signal.c: process_pending_signals

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Process the currently queued signals.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-08 21:52:26 -07:00
parent 08eb66d5d8
commit d7acd31780
1 changed files with 55 additions and 1 deletions
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56
bsd-user/signal.c
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@ -756,8 +756,62 @@ static void handle_pending_signal(CPUArchState *env, int sig,
}
}
void process_pending_signals(CPUArchState *cpu_env)
void process_pending_signals(CPUArchState *env)
{
CPUState *cpu = env_cpu(env);
int sig;
sigset_t *blocked_set, set;
struct emulated_sigtable *k;
TaskState *ts = cpu->opaque;
while (qatomic_read(&ts->signal_pending)) {
sigfillset(&set);
sigprocmask(SIG_SETMASK, &set, 0);
restart_scan:
sig = ts->sync_signal.pending;
if (sig) {
/*
* Synchronous signals are forced by the emulated CPU in some way.
* If they are set to ignore, restore the default handler (see
* sys/kern_sig.c trapsignal() and execsigs() for this behavior)
* though maybe this is done only when forcing exit for non SIGCHLD.
*/
if (sigismember(&ts->signal_mask, target_to_host_signal(sig)) ||
sigact_table[sig - 1]._sa_handler == TARGET_SIG_IGN) {
sigdelset(&ts->signal_mask, target_to_host_signal(sig));
sigact_table[sig - 1]._sa_handler = TARGET_SIG_DFL;
}
handle_pending_signal(env, sig, &ts->sync_signal);
}
k = ts->sigtab;
for (sig = 1; sig <= TARGET_NSIG; sig++, k++) {
blocked_set = ts->in_sigsuspend ?
&ts->sigsuspend_mask : &ts->signal_mask;
if (k->pending &&
!sigismember(blocked_set, target_to_host_signal(sig))) {
handle_pending_signal(env, sig, k);
/*
* Restart scan from the beginning, as handle_pending_signal
* might have resulted in a new synchronous signal (eg SIGSEGV).
*/
goto restart_scan;
}
}
/*
* Unblock signals and check one more time. Unblocking signals may cause
* us to take another host signal, which will set signal_pending again.
*/
qatomic_set(&ts->signal_pending, 0);
ts->in_sigsuspend = false;
set = ts->signal_mask;
sigdelset(&set, SIGSEGV);
sigdelset(&set, SIGBUS);
sigprocmask(SIG_SETMASK, &set, 0);
}
ts->in_sigsuspend = false;
}
void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,