new NOFORKs: pwdx,kill[all5],ttysize,realpath,readlink NOEXECs: date,resize

function                                             old     new   delta
run_nofork_applet                                    258     280     +22
readlink_main                                        112     123     +11
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 33/0)               Total: 33 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/coreutils/realpath.c b/coreutils/realpath.c
index 6a61c3d..f9c6301 100644
--- a/coreutils/realpath.c
+++ b/coreutils/realpath.c
@@ -13,7 +13,7 @@
 //config:	Return the canonicalized absolute pathname.
 //config:	This isn't provided by GNU shellutils, but where else does it belong.
 
-//applet:IF_REALPATH(APPLET(realpath, BB_DIR_USR_BIN, BB_SUID_DROP))
+//applet:IF_REALPATH(APPLET_NOFORK(realpath, realpath, BB_DIR_USR_BIN, BB_SUID_DROP, realpath))
 
 //kbuild:lib-$(CONFIG_REALPATH) += realpath.o
 
@@ -36,6 +36,7 @@
 	}
 
 	do {
+		/* NOFORK: only one alloc is allowed; must free */
 		char *resolved_path = xmalloc_realpath(*argv);
 		if (resolved_path != NULL) {
 			puts(resolved_path);