Function sys_execve

components/lwp/lwp_syscall.c:3751–3948

* @brief Executes a program in the current process. * * This system call replaces the current process image with a new program specified by the * `path` argument. It loads the program located at the given `path` and passes the arguments * (`argv`) and environment variables (`envp`) to it. This effectively replaces the calling * process with a new one, and if successful, it never returns. If t

 *       image is replaced by the new program.
 */
sysret_t sys_execve(const char *path, char *const argv[], char *const envp[])
{
    rt_err_t error = -1;
    size_t len;
    struct rt_lwp *new_lwp = NULL;
    struct rt_lwp *lwp;
    int uni_thread;
    rt_thread_t thread;
    struct process_aux *aux;
    struct lwp_args_info args_info;
    char *kpath = RT_NULL;

    lwp = lwp_self();
    thread = rt_thread_self();
    uni_thread = 1;

    LWP_LOCK(lwp);
    if (lwp->t_grp.prev != &thread->sibling)
    {
        uni_thread = 0;
    }
    if (lwp->t_grp.next != &thread->sibling)
    {
        uni_thread = 0;
    }
    LWP_UNLOCK(lwp);

    if (!uni_thread)
    {
        return -EINVAL;
    }

    len = lwp_user_strlen(path);
    if (len <= 0)
    {
        return -EFAULT;
    }

    kpath = rt_malloc(len + 1);
    if (!kpath)
    {
        return -ENOMEM;
    }

    if (lwp_get_from_user(kpath, (void *)path, len) != len)
    {
        rt_free(kpath);
        return -EFAULT;
    }
    kpath[len] = '\0';

    if (access(kpath, X_OK) != 0)
    {
        error = rt_get_errno();
        rt_free(kpath);
        return (sysret_t)error;
    }