libbb: introduce and use msleep()

function                                             old     new   delta
msleep                                                 -      45     +45
watchdog_main                                        271     266      -5
common_traceroute_main                              3546    3530     -16
beep_main                                            277     248     -29
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/3 up/down: 45/-50)             Total: -5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

5 files changed, 20 insertions, 6 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 9fa0ce90d..18dc9f935 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1602,7 +1602,8 @@ char *bb_simplify_path(const char *path) FAST_FUNC;
 char *bb_simplify_abs_path_inplace(char *path) FAST_FUNC;
 
 void pause_after_failed_login(void) FAST_FUNC;
-void bb_do_delay(int seconds) FAST_FUNC;
+void bb_do_delay(unsigned seconds) FAST_FUNC;
+void msleep(unsigned ms) FAST_FUNC;
 void sleep1(void) FAST_FUNC;
 void change_identity(const struct passwd *pw) FAST_FUNC;
 void run_shell(const char *shell, int loginshell, const char **args) NORETURN FAST_FUNC;
diff --git a/libbb/bb_do_delay.c b/libbb/bb_do_delay.c
index 3a86dc2ae..3dbf032db 100644
--- a/libbb/bb_do_delay.c
+++ b/libbb/bb_do_delay.c
@@ -8,7 +8,7 @@
  */
 #include "libbb.h"
 
-/* void FAST_FUNC bb_do_delay(int seconds) { ... } - no users yet */
+/* void FAST_FUNC bb_do_delay(unsigned seconds) { ... } - no users yet */
 
 #ifndef LOGIN_FAIL_DELAY
 #define LOGIN_FAIL_DELAY 3
@@ -34,3 +34,16 @@ void FAST_FUNC sleep1(void)
         sleep(1);
 }
 
+void FAST_FUNC msleep(unsigned ms)
+{
+        /* 1. usleep(n) is not guaranteed by standards to accept n >= 1000000
+         * 2. multiplication in usleep(ms * 1000) can overflow if ms > 4294967
+         *    (sleep of ~71.5 minutes)
+         * Let's play safe and loop:
+         */
+        while (ms > 500) {
+                usleep(500000);
+                ms -= 500;
+        }
+        usleep(ms * 1000);
+}
diff --git a/miscutils/beep.c b/miscutils/beep.c
index 1669332fd..7c60aed08 100644
--- a/miscutils/beep.c
+++ b/miscutils/beep.c
@@ -114,10 +114,10 @@ int beep_main(int argc, char **argv)
                 while (rep) {
 //bb_error_msg("rep[%d] freq=%d, length=%d, delay=%d", rep, freq, length, delay);
                         xioctl(speaker, KIOCSOUND, (void*)(uintptr_t)tickrate_div_freq);
-                        usleep(1000 * length);
+                        msleep(length);
                         ioctl(speaker, KIOCSOUND, (void*)0);
                         if (--rep)
-                                usleep(1000 * delay);
+                                msleep(delay);
                 }
         }
 
diff --git a/miscutils/watchdog.c b/miscutils/watchdog.c
index 8c8d7217f..971b777a3 100644
--- a/miscutils/watchdog.c
+++ b/miscutils/watchdog.c
@@ -143,7 +143,7 @@ int watchdog_main(int argc UNUSED_PARAM, char **argv)
                  * as the counter value is undefined at this point -- PFM
                  */
                 write(3, "", 1); /* write zero byte */
-                usleep(stimer_duration * 1000L);
+                msleep(stimer_duration);
         }
         return EXIT_SUCCESS; /* - not reached, but gcc 4.2.1 is too dumb! */
 }
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 1c4dc3e4a..34d2a09dd 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -1071,7 +1071,7 @@ common_traceroute_main(int op, char **argv)
 
                         fflush_all();
                         if (probe != 0 && pausemsecs > 0)
-                                usleep(pausemsecs * 1000);
+                                msleep(pausemsecs);
 
                         send_probe(++seq, ttl);
                         t2 = t1 = monotonic_us();