ktrace(1): teach about KTR_EXTERR

Reviewed by:	brooks
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D50633

usr.bin/ktrace/ktrace.1

@@ -150,9 +150,13 @@ arguments
 trace
 .Xr execve 2
 environment variables
+.It Cm x
+trace
+.Xr exterr 2
+extended errors reports from kernel
 .It Cm +
 trace the default set of trace points -
-.Cm a, c , e,  i , n , s , t , u , y
+.Cm a, c , e,  i , n , s , t , u , x, y
 .El
 .It Ar command
 Execute

usr.bin/ktrace/ktrace.h

@@ -32,7 +32,7 @@
 #define DEF_POINTS (KTRFAC_SYSCALL | KTRFAC_SYSRET | KTRFAC_NAMEI | \
 		    KTRFAC_GENIO | KTRFAC_PSIG | KTRFAC_USER | \
 		    KTRFAC_STRUCT | KTRFAC_SYSCTL | KTRFAC_STRUCT_ARRAY | \
-		    KTRFAC_ARGS | KTRFAC_ENVS)
+		    KTRFAC_ARGS | KTRFAC_ENVS | KTRFAC_EXTERR)
 
 #define PROC_ABI_POINTS (KTRFAC_PROCCTOR | KTRFAC_PROCDTOR)
 

usr.bin/ktrace/subr.c

@@ -87,6 +87,8 @@ getpoints(char *s)
 		case 'e':
 		        facs |= KTRFAC_ENVS;
 			break;
+		case 'x':
+			facs |= KTRFAC_EXTERR;
 		case '+':
 			facs |= DEF_POINTS;
 			break;