Implement the nwchan keyword that has been in the man page, but was

not implemented. This is just handy if you want to ddb the address
some process is waiting on.

bin/ps/extern.h

@@ -63,6 +63,7 @@ void	 lstarted(KINFO *, VARENT *);
 void	 maxrss(KINFO *, VARENT *);
 void	 lockname(KINFO *, VARENT *);
 void	 mwchan(KINFO *, VARENT *);
+void	 nwchan(KINFO *, VARENT *);
 void	 pagein(KINFO *, VARENT *);
 void	 parsefmt(const char *, int);
 void	 pcpu(KINFO *, VARENT *);

bin/ps/keyword.c

@@ -127,6 +127,7 @@ static VAR var[] = {
 		LONG, "ld", 0},
 	{"nvcsw", "NVCSW", NULL, USER, rvar, NULL, 5, ROFF(ru_nvcsw),
 		LONG, "ld", 0},
+	{"nwchan", "NWCHAN", NULL, LJUST, nwchan, NULL, 8, 0, CHAR, NULL, 0},
 	{"oublk", "OUBLK", NULL, USER, rvar, NULL, 4, ROFF(ru_oublock),
 		LONG, "ld", 0},
 	{"oublock", "", "oublk", 0, NULL, NULL, 0, 0, CHAR, NULL, 0},

bin/ps/print.c

@@ -456,6 +456,19 @@ wchan(KINFO *k, VARENT *ve)
 		(void)printf("%-*s", v->width, "-");
 }
 
+void
+nwchan(KINFO *k, VARENT *ve)
+{
+	VAR *v;
+
+	v = ve->var;
+	if (k->ki_p->ki_wchan) {
+		(void)printf("%0*lx", v->width,
+		    (long)k->ki_p->ki_wchan);
+	} else
+		(void)printf("%-*s", v->width, "-");
+}
+
 void
 mwchan(KINFO *k, VARENT *ve)
 {