*: introduce and use xvfork()

function                                             old     new   delta
time_main                                           1052    1285    +233
crontab_main                                         623     856    +233
ifupdown_main                                       2202    2403    +201
xvfork                                                 -      20     +20
passwd_main                                         1049    1053      +4
grave                                               1068    1066      -2
script_main                                          935     921     -14
vfork_or_die                                          20       -     -20
vfork_compressor                                     206     175     -31
open_as_user                                         109       -    -109
popen2                                               218       -    -218
edit_file                                            910     690    -220
run_command                                          268       -    -268
------------------------------------------------------------------------------
(add/remove: 1/4 grow/shrink: 4/4 up/down: 691/-882)         Total: -191 bytes

1 files changed, 1 insertions, 3 deletions

diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index 37d4c274e..9baa813a1 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -226,9 +226,7 @@ void FAST_FUNC forkexit_or_rexec(char **argv)
         if (re_execed)
                 return;
 
-        pid = vfork();
-        if (pid < 0) /* wtf? */
-                bb_perror_msg_and_die("vfork");
+        pid = xvfork();
         if (pid) /* parent */
                 exit(EXIT_SUCCESS);
         /* child - re-exec ourself */