libbb: introduce and use xsettimeofday()

function                                             old     new   delta
xsettimeofday                                          -      25     +25
rdate_main                                           274     260     -14
step_time                                            348     331     -17
set_kernel_timezone_and_clock                        119     102     -17
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/3 up/down: 25/-48)            Total: -23 bytes
   text	   data	    bss	    dec	    hex	filename
1020753	    559	   5052	1026364	  fa93c	busybox_old
1020708	    559	   5052	1026319	  fa90f	busybox_unstripped

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

1 files changed, 18 insertions, 0 deletions

diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index db40e996b..6c220434d 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -702,3 +702,21 @@ void FAST_FUNC xvfork_parent_waits_and_exits(void)
 	}
 	/* Child continues */
 }
+
+// Useful when we do know that pid is valid, and we just want to wait
+// for it to exit. Not existing pid is fatal. waitpid() status is not returned.
+int FAST_FUNC wait_for_exitstatus(pid_t pid)
+{
+	int exit_status, n;
+
+	n = safe_waitpid(pid, &exit_status, 0);
+	if (n < 0)
+		bb_simple_perror_msg_and_die("waitpid");
+	return exit_status;
+}
+
+void FAST_FUNC xsettimeofday(const struct timeval *tv)
+{
+	if (settimeofday(tv, NULL))
+		bb_simple_perror_msg_and_die("settimeofday");
+}