init: make comment more understandable. no code changes

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

diff --git a/init/init.c b/init/init.c
index ce26428..35f64cf 100644 (file)
--- a/init/init.c
+++ b/init/init.c
@@ -960,7 +960,6 @@ int init_main(int argc UNUSED_PARAM, char **argv)
                bb_signals_recursive_norestart((1 << SIGHUP), record_signo);
 
        /* Now run the looping stuff for the rest of forever.
-        * NB: if delayed signal happened, avoid blocking in wait().
         */
        while (1) {
                int maybe_WNOHANG;
@@ -976,10 +975,11 @@ int init_main(int argc UNUSED_PARAM, char **argv)
                maybe_WNOHANG |= check_delayed_sigs();
 
                /* Wait for any child process(es) to exit.
-                * NB: "delayed" signals will also interrupt this wait(),
-                * bb_signals_recursive_norestart() set them up for that.
-                * This guarantees we won't be stuck here
-                * till next orphan dies.
+                *
+                * If check_delayed_sigs above reported that a signal
+                * was caught, wait will be nonblocking. This ensures
+                * that if SIGHUP has reloaded inittab, respawn and askfirst
+                * actions will not be delayed until next child death.
                 */
                if (maybe_WNOHANG)
                        maybe_WNOHANG = WNOHANG;
@@ -987,6 +987,9 @@ int init_main(int argc UNUSED_PARAM, char **argv)
                        pid_t wpid;
                        struct init_action *a;
 
+                       /* If signals happen _in_ the wait, they interrupt it,
+                        * bb_signals_recursive_norestart set them up that way
+                        */
                        wpid = waitpid(-1, NULL, maybe_WNOHANG);
                        if (wpid <= 0)
                                break;