From 0977bd1e889aae7c131863a72f37c71bfa0345d1 Mon Sep 17 00:00:00 2001
From: Ed Schouten <ed@FreeBSD.org>
Date: Mon, 30 May 2016 13:51:27 +0000
Subject: [PATCH] Fix the signature of the psignal() function.

POSIX 2008 added the psignal() function which has already been part of
the BSDs for a long time. The only difference is, the POSIX version uses
an 'int' for the signal number, unlike our version which uses an
'unsigned int'. Fix up the function to use an 'int'. This should not
affect the ABI.
---
 include/signal.h       | 2 +-
 lib/libc/gen/psignal.3 | 4 ++--
 lib/libc/gen/psignal.c | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/signal.h b/include/signal.h
index 217faddea03..9f33fb66d8c 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -113,7 +113,7 @@ int	siginterrupt(int, int);
 #endif
 
 #if __POSIX_VISIBLE >= 200809
-void	psignal(unsigned int, const char *);
+void	psignal(int, const char *);
 #endif
 
 #if __BSD_VISIBLE
diff --git a/lib/libc/gen/psignal.3 b/lib/libc/gen/psignal.3
index 231acfa5e10..ed7023b7a3f 100644
--- a/lib/libc/gen/psignal.3
+++ b/lib/libc/gen/psignal.3
@@ -28,7 +28,7 @@
 .\"     @(#)psignal.3	8.2 (Berkeley) 2/27/95
 .\" $FreeBSD$
 .\"
-.Dd February 4, 2011
+.Dd May 30, 2016
 .Dt PSIGNAL 3
 .Os
 .Sh NAME
@@ -42,7 +42,7 @@
 .Sh SYNOPSIS
 .In signal.h
 .Ft void
-.Fn psignal "unsigned sig" "const char *s"
+.Fn psignal "int sig" "const char *s"
 .Vt extern const char * const sys_siglist[] ;
 .Vt extern const char * const sys_signame[] ;
 .In string.h
diff --git a/lib/libc/gen/psignal.c b/lib/libc/gen/psignal.c
index 5c5aadae33a..d1c70c60064 100644
--- a/lib/libc/gen/psignal.c
+++ b/lib/libc/gen/psignal.c
@@ -44,11 +44,11 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 
 void
-psignal(unsigned int sig, const char *s)
+psignal(int sig, const char *s)
 {
 	const char *c;
 
-	if (sig < NSIG)
+	if (sig >= 0 && sig < NSIG)
 		c = sys_siglist[sig];
 	else
 		c = "Unknown signal";