halt: write wtmp entry if wtmp support is enabled

1 files changed, 38 insertions, 5 deletions

diff --git a/init/halt.c b/init/halt.c
index d9f8b1afc..c50d8af63 100644
--- a/init/halt.c
+++ b/init/halt.c
@@ -10,6 +10,11 @@
 #include "libbb.h"
 #include <sys/reboot.h>
 
+#if ENABLE_FEATURE_WTMP
+#include <sys/utsname.h>
+#include <utmp.h>
+#endif
+
 int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int halt_main(int argc, char **argv)
 {
@@ -26,18 +31,46 @@ RB_POWERDOWN,
 #endif
 RB_AUTOBOOT
         };
-        static const int signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
+        static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
 
         char *delay;
         int which, flags, rc = 1;
+#if ENABLE_FEATURE_WTMP
+        struct utmp utmp;
+        struct timeval tv;
+        struct utsname uts;
+#endif
 
         /* Figure out which applet we're running */
-        for (which = 0; "hpr"[which] != *applet_name; which++);
+        for (which = 0; "hpr"[which] != *applet_name; which++)
+                continue;
 
         /* Parse and handle arguments */
-        flags = getopt32(argv, "d:nf", &delay);
-        if (flags & 1) sleep(xatou(delay));
-        if (!(flags & 2)) sync();
+        flags = getopt32(argv, "d:nfw", &delay);
+        if (flags & 1)
+                sleep(xatou(delay));
+
+#if ENABLE_FEATURE_WTMP
+        if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
+                close(creat(bb_path_wtmp_file, 0664));
+        }
+        memset(&utmp, 0, sizeof(utmp));
+        gettimeofday(&tv, NULL);
+        utmp.ut_tv.tv_sec = tv.tv_sec;
+        utmp.ut_tv.tv_usec = tv.tv_usec;
+        safe_strncpy(utmp.ut_user, "shutdown", UT_NAMESIZE);
+        utmp.ut_type = RUN_LVL;
+        safe_strncpy(utmp.ut_id, "~~", sizeof(utmp.ut_id));
+        safe_strncpy(utmp.ut_line, "~~", UT_LINESIZE);
+        if (uname(&uts) == 0)
+                safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
+        updwtmp(bb_path_wtmp_file, &utmp);
+#endif /* !ENABLE_FEATURE_WTMP */
+
+        if (flags & 8) /* -w */
+                return 0;
+        if (!(flags & 2)) /* no -n */
+                sync();
 
         /* Perform action. */
         if (ENABLE_INIT && !(flags & 4)) {