echo

Results 5 issues of echo

```python str = ( """ This is a test string. """ ) ``` after `print(token)`: ```sh (Token.Literal.String.Doc, '"""\n This is a test string.\n """') ```

`tcp_text.c:129`: `tcp_send_ack(tsk, NULL);` may cause errors if argment `seg` is NULL,

In this function, uwsgi mask all signals: ```c++ void uwsgi_setup_thread_req(long core_id, struct wsgi_request *wsgi_req) { int i; sigset_t smask; pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &i); pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &i); pthread_setspecific(uwsgi.tur_key, (void *) wsgi_req); if (core_id >...

![Image](https://github.com/user-attachments/assets/322f61ba-92ae-45a5-8af7-9b99b83b0da1)

Needs-Triage