Function sys_sigpending

components/lwp/lwp_syscall.c:6625–6651

* @brief Retrieves the set of signals that are pending for delivery to the calling process. * * This system call allows a process to query the set of signals that are pending, i.e., signals that have * been sent to the process but have not yet been delivered because the process is blocking those signals * or has not yet handled them. The function returns the set of signals that are waiting to

 * @see sys_sigaction(), sys_sigprocmask()
 */
sysret_t sys_sigpending(sigset_t *sigset, size_t sigsize)
{
    sysret_t ret = 0;
    lwp_sigset_t lwpset;

    /* Verify and Get sigset, timeout */
    if (!sigset || !lwp_user_accessable((void *)sigset, sigsize))
    {
        ret = -EFAULT;
    }
    else
    {
        /* Fit sigset size to lwp set */
        if (sizeof(lwpset) < sigsize)
        {
            LOG_I("%s: sigsize (%lx) extends lwp sigset chunk\n", __func__, sigsize);
            sigsize = sizeof(lwpset);
        }

        lwp_thread_signal_pending(rt_thread_self(), &lwpset);

        if (!lwp_put_to_user(sigset, &lwpset, sigsize))
            RT_ASSERT(0);   /* should never happened */
    }

    return ret;
}

/**
 * @brief Waits for a signal to be delivered, with a timeout.