libbb: split update_utmp from login/getty in preparation to use it for telnetd
function old new delta
update_utent - 339 +339
login_main 1498 1128 -370
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 339/-370) Total: -31 bytes
function old new delta
update_utmp 246 337 +91
login_main 1128 1140 +12
getty_main 1908 1918 +10
...
update_utent 339 - -339
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 5/6 up/down: 119/-368) Total: -249 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/libbb.h b/include/libbb.h
index e674e4a..ea61701 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -796,6 +796,12 @@
#define die_if_bad_username(name) ((void)(name))
#endif
+#if ENABLE_FEATURE_UTMP
+void FAST_FUNC update_utmp(int new_type, const char *short_tty, const char *username, const char *opt_host);
+#else
+# define update_utmp(new_type, short_tty, username, opt_host) ((void)0)
+#endif
+
int execable_file(const char *name) FAST_FUNC;
char *find_execable(const char *filename, char **PATHp) FAST_FUNC;
int exists_execable(const char *filename) FAST_FUNC;