tcp/udpsvd: robustify SIGCHLD handling

function                                             old     new   delta
if_verbose_print_connection_status                     -      40     +40
tcpudpsvd_main                                      1798    1794      -4
connection_status                                     31       -     -31
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/1 up/down: 40/-35)              Total: 5 bytes

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

1 files changed, 4 insertions, 1 deletions

diff --git a/runit/runsv.c b/runit/runsv.c
index ecab8cdf5..61ea240ff 100644
--- a/runit/runsv.c
+++ b/runit/runsv.c
@@ -380,7 +380,10 @@ static void startservice(struct svdir *s)
                                 xdup2(logpipe.wr, 1);
                         }
                 }
-                /* Non-ignored signals revert to SIG_DFL on exec anyway */
+                /* Non-ignored signals revert to SIG_DFL on exec anyway.
+                 * But we can get signals BEFORE execl(), this is unlikely
+                 * but wouldn't be good...
+                 */
                 /*bb_signals(0
                         + (1 << SIGCHLD)
                         + (1 << SIGTERM)