Use pledge(2).

Initial patch from Ali H. Fardan.

ok sthen@ jung@

net/sic/Makefile

@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.5 2013/10/19 09:49:51 jung Exp $
+# $OpenBSD: Makefile,v 1.6 2016/08/14 15:35:14 jca Exp $
 
 COMMENT=		simple irc client
 
 DISTNAME=		sic-1.2
+REVISION=		0
 
 CATEGORIES=		net
 
@@ -13,6 +14,7 @@ MAINTAINER =		Joerg Jung <jung@openbsd.org>
 # MIT/X
 PERMIT_PACKAGE_CDROM=	Yes
 
+# uses pledge()
 WANTLIB=		c
 
 MASTER_SITES=		http://dl.suckless.org/tools/

net/sic/patches/patch-sic_c

@@ -0,0 +1,12 @@
+$OpenBSD: patch-sic_c,v 1.3 2016/08/14 15:35:14 jca Exp $
+--- sic.c.orig	Fri Aug 12 21:45:07 2016
++++ sic.c	Fri Aug 12 21:54:39 2016
+@@ -173,6 +173,8 @@ main(int argc, char *argv[]) {
+ 	fflush(srv);
+ 	setbuf(stdout, NULL);
+ 	setbuf(srv, NULL);
++	if (pledge("stdio", NULL) == -1)
++		eprint("error: pledge:");
+ 	for(;;) { /* main loop */
+ 		FD_ZERO(&rd);
+ 		FD_SET(0, &rd);