ash: allow long-running nofork applets to be interrupted

Nofork applets can't be interrupted with ctrl-c.  This isn't an
issue for most such applets because they do very little and won't
run for very long.  However 'yes' and 'seq 10000000' can't be
interrupted in a interactive shell, which is awkward.

As a special case ignore the nofork-ness of these applets if they're
run from an interactive shell.

This isn't foolproof as there are still ways to run them such that
they can't be interrupted, but it helps.

1 files changed, 16 insertions, 0 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 3cdf0c613..401475f18 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -310,6 +310,22 @@ int FAST_FUNC find_applet_by_name(const char *name)
 #endif
 }
 
+# if ENABLE_PLATFORM_MINGW32 && ENABLE_FEATURE_SH_NOFORK
+int FAST_FUNC long_running_applet(int applet_no)
+{
+        int ret = 0;
+
+#if defined(APPLET_NO_seq)
+        ret |= (applet_no == APPLET_NO_seq);
+#endif
+#if defined(APPLET_NO_yes)
+        ret |= (applet_no == APPLET_NO_yes);
+#endif
+
+        return ret;
+}
+#endif
+
 
 void lbb_prepare(const char *applet
                 IF_FEATURE_INDIVIDUAL(, char **argv))