libbb: introduce and use safe_waitpid (loops in EINTR)

*: use more approproate (shorter) versions of wait()

function                                             old     new   delta
safe_waitpid                                           -      48     +48
wait_any_nohang                                        -      17     +17
send_tree                                            365     369      +4
processorstop                                        432     435      +3
text_yank                                            110     108      -2
make_human_readable_str                              202     200      -2
crond_main                                          1368    1366      -2
handle_sigchld                                        49      43      -6
reapchild                                            166     159      -7
custom                                               260     250     -10
checkscript                                          191     177     -14
wait_nohang                                           17       -     -17
wait_pid                                              43       -     -43
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 2/7 up/down: 72/-103)           Total: -31 bytes

1 files changed, 2 insertions, 2 deletions

diff --git a/runit/svlogd.c b/runit/svlogd.c
index 2dc8cb987..1d679c972 100644
--- a/runit/svlogd.c
+++ b/runit/svlogd.c
@@ -265,7 +265,7 @@ static unsigned processorstop(struct logdir *ld)
 
         if (ld->ppid) {
                 sig_unblock(SIGHUP);
-                while (wait_pid(&wstat, ld->ppid) == -1)
+                while (safe_waitpid(ld->ppid, &wstat, 0) == -1)
                         pause2cannot("wait for processor", ld->name);
                 sig_block(SIGHUP);
                 ld->ppid = 0;
@@ -794,7 +794,7 @@ static void sig_child_handler(int sig_no)
 
         if (verbose)
                 bb_error_msg(INFO"sig%s received", "child");
-        while ((pid = wait_nohang(&wstat)) > 0) {
+        while ((pid = wait_any_nohang(&wstat)) > 0) {
                 for (l = 0; l < dirn; ++l) {
                         if (dir[l].ppid == pid) {
                                 dir[l].ppid = 0;