bin: Handle CONT signal properly under leaks command

On macOS, we need to handle COND signal properly.
This is because under controling leaks command, it also sends COND
signal after releasing its managing process(es).
To mitigate this, we need to use flag to mark for distinguish dump to be
requested.
And we need to run it inside main loop.

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

Author: cosmo0920

src/fluent-bit.c

@@ -74,6 +74,7 @@ flb_ctx_t *ctx;
 struct flb_config *config;
 volatile sig_atomic_t exit_signal = 0;
 volatile sig_atomic_t flb_bin_restarting = FLB_RELOAD_IDLE;
+volatile sig_atomic_t dump_requested = 0;
 
 #ifdef FLB_HAVE_LIBBACKTRACE
 struct flb_stacktrace flb_st;
@@ -636,7 +637,7 @@ static void flb_signal_handler(int signal)
         abort();
 #ifndef FLB_SYSTEM_WINDOWS
     case SIGCONT:
-        flb_dump(ctx->config);
+        dump_requested = 1;
         break;
 #ifndef FLB_HAVE_STATIC_CONF
     case SIGHUP:
@@ -1491,6 +1492,11 @@ static int flb_main_run(int argc, char **argv)
 #ifdef FLB_SYSTEM_WINDOWS
         flb_console_handler_set_ctx(ctx, cf_opts);
 #endif
+        if (dump_requested) {
+            dump_requested = 0;
+            flb_dump(ctx->config);
+        }
+
         if (flb_bin_restarting == FLB_RELOAD_IN_PROGRESS) {
             if (supervisor_reload_notified == FLB_FALSE &&
                 ctx != NULL && ctx->config != NULL) {