D47741.diff
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	diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
	--- a/sys/kern/kern_sig.c
	+++ b/sys/kern/kern_sig.c
	@@ -365,6 +365,16 @@
	SIGFILLSET(fastblock_mask);
	SIG_CANTMASK(fastblock_mask);
	ast_register(TDA_SIG, ASTR_UNCOND, 0, ast_sig);
	+
	+ /*
	+ * TDA_PSELECT is for the case where the signal mask should be restored
	+ * before delivering any signals so that we do not deliver any that are
	+ * blocked by the normal thread mask. It is mutually exclusive with
	+ * TDA_SIGSUSPEND, which should be used if we do want to deliver
	+ * signals that are normally blocked, e.g., if it interrupted our sleep.
	+ */
	+ ast_register(TDA_PSELECT, ASTR_ASTF_REQUIRED \| ASTR_TDP,
	+ TDP_OLDMASK, ast_sigsuspend);
	ast_register(TDA_SIGSUSPEND, ASTR_ASTF_REQUIRED \| ASTR_TDP,
	TDP_OLDMASK, ast_sigsuspend);
	}
	diff --git a/sys/sys/param.h b/sys/sys/param.h
	--- a/sys/sys/param.h
	+++ b/sys/sys/param.h
	@@ -73,7 +73,7 @@
	* cannot include sys/param.h and should only be updated here.
	*/
	#undef __FreeBSD_version
	-#define __FreeBSD_version 1500027
	+#define __FreeBSD_version 1500028

	/*
	* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
	diff --git a/sys/sys/proc.h b/sys/sys/proc.h
	--- a/sys/sys/proc.h
	+++ b/sys/sys/proc.h
	@@ -494,6 +494,7 @@
	TDA_RACCT,
	TDA_MOD1, /* For third party use, before signals are */
	TAD_MOD2, /* processed .. */
	+ TDA_PSELECT, /* For discarding temporary signal mask */
	TDA_SIG,
	TDA_KTRACE,
	TDA_SUSPEND,