D3365.id7896.diff
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	Index: head/sys/kern/kern_sig.c
	===================================================================
	--- head/sys/kern/kern_sig.c
	+++ head/sys/kern/kern_sig.c
	@@ -952,6 +952,7 @@
	void
	execsigs(struct proc *p)
	{
	+ sigset_t osigignore;
	struct sigacts *ps;
	int sig;
	struct thread *td;
	@@ -971,6 +972,24 @@
	if ((sigprop(sig) & SA_IGNORE) != 0)
	sigqueue_delete_proc(p, sig);
	}
	+
	+ /*
	+ * As CloudABI processes cannot modify signal handlers, fully
	+ * reset all signals to their default behavior. Do ignore
	+ * SIGPIPE, as it would otherwise be impossible to recover from
	+ * writes to broken pipes and sockets.
	+ */
	+ if (SV_PROC_ABI(p) == SV_ABI_CLOUDABI) {
	+ osigignore = ps->ps_sigignore;
	+ while (SIGNOTEMPTY(osigignore)) {
	+ sig = sig_ffs(&osigignore);
	+ SIGDELSET(osigignore, sig);
	+ if (sig != SIGPIPE)
	+ sigdflt(ps, sig);
	+ }
	+ SIGADDSET(ps->ps_sigignore, SIGPIPE);
	+ }
	+
	/*
	* Reset stack state to the user stack.
	* Clear set of signals caught on the signal stack.