add ulimit and umask as builtins
diff --git a/src/cmd/rc/plan9ish.c b/src/cmd/rc/plan9ish.c
index af1e449..bd9698c 100644
--- a/src/cmd/rc/plan9ish.c
+++ b/src/cmd/rc/plan9ish.c
@@ -34,6 +34,8 @@
 void execfinit(void);
 void execbind(void);
 void execmount(void);
+void execulimit(void);
+void execumask(void);
 builtin Builtin[]={
 	"cd",		execcd,
 	"whatis",	execwhatis,
@@ -45,6 +47,8 @@
 	".",		execdot,
 	"finit",	execfinit,
 	"flag",		execflag,
+	"ulimit",	execulimit,
+	"umask",	execumask,
 	0
 };
 #define	SEP	'\1'