From 6bdfbc4cb5470f63d4905e89f89a9829af354316 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 18 Feb 2021 23:30:24 +0100 Subject: libbb: fix '--help' handling in FEATURE_SH_NOFORK=y Most BusyBox applets respond to the '--help' option by printing a usage message. This is normally handled by busybox_main() so applet main routines don't have support for '--help'. In standalone shell mode with FEATURE_SH_NOFORK enabled nofork applets are invoked directly, bypassing busybox_main(). This results in inconsistent handling of '--help': - applets which call getopt() report "unrecognized option '--help'" and print help anyway; - realpath says "--help: No such file or directory" and doesn't print help; - usleep says "invalid number '--help'" and doesn't print help. Avoid inconsistency by checking for '--help' in run_nofork_applet(). Bug found by Ron Yorston. function old new delta show_usage_if_dash_dash_help - 70 +70 run_nofork_applet 347 362 +15 run_applet_no_and_exit 432 365 -67 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/1 up/down: 85/-67) Total: 18 bytes Signed-off-by: Denys Vlasenko --- include/libbb.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/libbb.h') diff --git a/include/libbb.h b/include/libbb.h index 135d9111d..ece03e7d8 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -1219,6 +1219,7 @@ void run_noexec_applet_and_exit(int a, const char *name, char **argv) NORETURN F int find_applet_by_name(const char *name) FAST_FUNC; void run_applet_no_and_exit(int a, const char *name, char **argv) NORETURN FAST_FUNC; #endif +void show_usage_if_dash_dash_help(int applet_no, char **argv) FAST_FUNC; #if defined(__linux__) void set_task_comm(const char *comm) FAST_FUNC; #else -- cgit v1.2.3