Function sys_sigprocmask

components/lwp/lwp_syscall.c:6535–6600

* @brief Sets or retrieves the signal mask for the calling process. * * This system call allows the caller to block or unblock signals by modifying the signal mask. The signal * mask determines which signals are blocked and which signals can be delivered to the process. The * function can also be used to retrieve the current signal mask. * * @param[in] how The action to be taken on the

 * @see sys_sigaction(), sys_sigpending()
 */
sysret_t sys_sigprocmask(int how, const sigset_t *sigset, sigset_t *oset, size_t size)
{
    int ret = -1;
    lwp_sigset_t *pnewset = RT_NULL, *poldset = RT_NULL;
#ifdef ARCH_MM_MMU
    lwp_sigset_t newset, oldset;
#endif /* ARCH_MM_MMU*/

    if (!size)
    {
        return -EINVAL;
    }
    if (!oset && !sigset)
    {
        return -EINVAL;
    }
    if (size > sizeof(lwp_sigset_t))
    {
        size = sizeof(lwp_sigset_t);
    }
    if (oset)
    {
#ifdef ARCH_MM_MMU
        if (!lwp_user_accessable((void *)oset, size))
        {
            return -EFAULT;
        }
        poldset = &oldset;
#else
        if (!lwp_user_accessable((void *)oset, size))
        {
            return -EFAULT;
        }
        poldset = (lwp_sigset_t *)oset;
#endif
    }
    if (sigset)
    {
#ifdef ARCH_MM_MMU
        if (!lwp_user_accessable((void *)sigset, size))
        {
            return -EFAULT;
        }
        lwp_get_from_user(&newset, (void *)sigset, size);
        pnewset = &newset;
#else
        if (!lwp_user_accessable((void *)sigset, size))
        {
            return -EFAULT;
        }
        pnewset = (lwp_sigset_t *)sigset;
#endif /* ARCH_MM_MMU */
    }
    ret = lwp_thread_signal_mask(rt_thread_self(), mask_command_u2k[how], pnewset, poldset);
#ifdef ARCH_MM_MMU
    if (ret < 0)
    {
        return ret;