Function _query_event_from_lwp

components/lwp/lwp_pid.c:1229–1252

* @brief Queries process state change events from a child process * * @param[in] child The child process to query * @param[in] cur_thr The current thread context * @param[in] self_lwp The parent process (current LWP) * @param[in] options Wait options (e.g., WSTOPPED) * @param[out] status Pointer to store child's status (optional) * * @return sysret_t Returns child PID if event found, or HA

 * @note Checks for termination or stopped state changes in child process
 */
static sysret_t _query_event_from_lwp(rt_lwp_t child, rt_thread_t cur_thr, rt_lwp_t self_lwp,
                                      int options, int *status)
{
    sysret_t rc;

    LWP_LOCK(child);
    if (child->terminated)
    {
        rc = child->pid;
    }
    else if ((options & WSTOPPED) && child->jobctl_stopped && !child->wait_reap_stp)
    {
        child->wait_reap_stp = 1;
        rc = child->pid;
    }
    else
    {
        rc = HAS_CHILD_BUT_NO_EVT;
    }
    LWP_UNLOCK(child);

    LOG_D("%s(child_pid=%d ('%s'), stopped=%d) => %d", __func__, child->pid, child->cmd, child->jobctl_stopped, rc);
    return rc;
}

/**
 * @brief Verifies and reaps a child process if conditions are met