Function _sys_fork

components/lwp/lwp_syscall.c:3557–3682

}

sysret_t _sys_fork(void)
{
    int tid = 0;
    sysret_t falival = 0;
    struct rt_lwp *lwp = RT_NULL;
    struct rt_lwp *self_lwp = RT_NULL;
    rt_thread_t thread = RT_NULL;
    rt_thread_t self_thread = RT_NULL;
    void *user_stack = RT_NULL;
    rt_processgroup_t group;

    /* new lwp */
    lwp = lwp_create(LWP_CREATE_FLAG_ALLOC_PID);
    if (!lwp)
    {
        SET_ERRNO(ENOMEM);
        goto fail;
    }

    /* new tid */
    if ((tid = lwp_tid_get()) == 0)
    {
        SET_ERRNO(ENOMEM);
        goto fail;
    }

    /* user space init */
    if (lwp_user_space_init(lwp, 1) != 0)
    {
        SET_ERRNO(ENOMEM);
        goto fail;
    }

    self_lwp = lwp_self();

    /* copy address space of process from this proc to forked one */
    if (lwp_fork_aspace(lwp, self_lwp) != 0)
    {
        SET_ERRNO(ENOMEM);
        goto fail;
    }

    /* copy lwp struct data */
    lwp_struct_copy(lwp, self_lwp);

    /* copy files */
    if (lwp_copy_files(lwp, self_lwp) != 0)
    {
        SET_ERRNO(ENOMEM);
        goto fail;
    }

    /* create thread */
    self_thread = rt_thread_self();

    thread = rt_thread_create(self_thread->parent.name,
            RT_NULL,
            RT_NULL,