Function sentinelCollectTerminatedScripts

app/redis-6.2.6/src/sentinel.c:908–951

Check for scripts that terminated, and remove them from the queue if the * script terminated successfully. If instead the script was terminated by * a signal, or returned exit code "1", it is scheduled to run again if * the max number of retries did not already elapsed. */

 * a signal, or returned exit code "1", it is scheduled to run again if
 * the max number of retries did not already elapsed. */
void sentinelCollectTerminatedScripts(void) {
    int statloc;
    pid_t pid;

    while ((pid = waitpid(-1, &statloc, WNOHANG)) > 0) {
        int exitcode = WEXITSTATUS(statloc);
        int bysignal = 0;
        listNode *ln;
        sentinelScriptJob *sj;

        if (WIFSIGNALED(statloc)) bysignal = WTERMSIG(statloc);
        sentinelEvent(LL_DEBUG,"-script-child",NULL,"%ld %d %d",
            (long)pid, exitcode, bysignal);

        ln = sentinelGetScriptListNodeByPid(pid);
        if (ln == NULL) {
            serverLog(LL_WARNING,"waitpid() returned a pid (%ld) we can't find in our scripts execution queue!", (long)pid);
            continue;
        }
        sj = ln->value;

        /* If the script was terminated by a signal or returns an
         * exit code of "1" (that means: please retry), we reschedule it
         * if the max number of retries is not already reached. */
        if ((bysignal || exitcode == 1) &&
            sj->retry_num != SENTINEL_SCRIPT_MAX_RETRY)
        {
            sj->flags &= ~SENTINEL_SCRIPT_RUNNING;
            sj->pid = 0;
            sj->start_time = mstime() +
                             sentinelScriptRetryDelay(sj->retry_num);
        } else {
            /* Otherwise let's remove the script, but log the event if the
             * execution did not terminated in the best of the ways. */
            if (bysignal || exitcode != 0) {
                sentinelEvent(LL_WARNING,"-script-error",NULL,
                              "%s %d %d", sj->argv[0], bysignal, exitcode);
            }
            listDelNode(sentinel.scripts_queue,ln);
            sentinelReleaseScriptJob(sj);
        }
        sentinel.running_scripts--;
    }
}

/* Kill scripts in timeout, they'll be collected by the
 * sentinelCollectTerminatedScripts() function. */