Function lwp_execve

components/lwp/lwp.c:488–635

* @brief Creates and starts a new LWP by loading and executing the specified executable file. * * @param[in] filename Path to the executable file * @param[in] debug Debug flag (non-zero to enable debugging) * @param[in] argc Argument count * @param[in] argv Argument vector * @param[in] envp Environment variables * * @return Process ID (PID) of the new LWP on success *

 *       7. Creates and starts the main thread
 */
pid_t lwp_execve(char *filename, int debug, int argc, char **argv, char **envp)
{
    int result;
    struct rt_lwp *lwp;
    char *thread_name;
    struct process_aux *aux;
    int tid = 0;

    if (filename == RT_NULL)
    {
        return -EINVAL;
    }

    if (access(filename, X_OK) != 0)
    {
        return -EACCES;
    }

    lwp = lwp_create(LWP_CREATE_FLAG_ALLOC_PID | LWP_CREATE_FLAG_NOTRACE_EXEC);

    if (lwp == RT_NULL)
    {
        LOG_E("lwp struct out of memory!\n");
        return -ENOMEM;
    }
    LOG_D("lwp malloc : %p, size: %d!", lwp, sizeof(struct rt_lwp));

    if ((tid = lwp_tid_get()) == 0)
    {
        lwp_ref_dec(lwp);
        return -ENOMEM;
    }
#ifdef ARCH_MM_MMU
    if (lwp_user_space_init(lwp, 0) != 0)
    {
        lwp_tid_put(tid);
        lwp_ref_dec(lwp);
        return -ENOMEM;
    }
#endif

    if ((aux = argscopy(lwp, argc, argv, envp)) == RT_NULL)
    {
        lwp_tid_put(tid);
        lwp_ref_dec(lwp);
        return -ENOMEM;
    }

    result = lwp_load(filename, lwp, RT_NULL, 0, aux);
    if (result == RT_EOK)
    {
        rt_thread_t thread = RT_NULL;
        rt_uint32_t priority = 25, tick = 200;

        lwp_execve_setup_stdio(lwp);

        /* obtain the base name */
        thread_name = strrchr(filename, '/');