tentatively fix getopt state corruption for NOFORK applets
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index 4e6ecde..3a386c5 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -131,12 +131,34 @@
applet_name = APPLET_NAME(applet_no);
xfunc_error_retval = EXIT_FAILURE;
- /*option_mask32 = 0; - not needed */
- /* special flag for xfunc_die(). If xfunc will "die"
+
+ /* Special flag for xfunc_die(). If xfunc will "die"
* in NOFORK applet, xfunc_die() sees negative
* die_sleep and longjmp here instead. */
die_sleep = -1;
+ /* Reset the libc getopt() function, which keeps internal state.
+ *
+ * BSD-derived getopt() functions require that optind be reset to 1 in
+ * order to reset getopt() state. This used to be generally accepted
+ * way of resetting getopt(). However, glibc's getopt()
+ * has additional getopt() state beyond optind, and requires that
+ * optind be set zero to reset its state. So the unfortunate state of
+ * affairs is that BSD-derived versions of getopt() misbehave if
+ * optind is set to 0 in order to reset getopt(), and glibc's getopt()
+ * will core ump if optind is set 1 in order to reset getopt().
+ *
+ * More modern versions of BSD require that optreset be set to 1 in
+ * order to reset getopt(). Sigh. Standards, anyone?
+ */
+#ifdef __GLIBC__
+ optind = 0;
+#else /* BSD style */
+ optind = 1;
+ /* optreset = 1; */
+#endif
+ /* option_mask32 = 0; - not needed */
+
argc = 1;
while (argv[argc])
argc++;