[erlang-questions] cerl: insert-string

[Monk Boy]

Hi all:
    I have used cerl to debug beam(./bin/cerl -gdb), Run the debug compiled
emulator in emacs and gdb.  When I input

```

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from beam.smp...
(gdb) r
Starting program:
/home/memacs/workspace/github/otp/bin/x86_64-unknown-linux-gnu/beam.smp
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffb5e7f700 (LWP 8112)]
[New Thread 0x7fffb40bf700 (LWP 8113)]
[New Thread 0x7fffb5ef2700 (LWP 8114)]
[Detaching after fork from child process 8115]
[New Thread 0x7fffb36bf700 (LWP 8116)]
[New Thread 0x7fffb35bc700 (LWP 8117)]
[New Thread 0x7fffb34b9700 (LWP 8118)]
[New Thread 0x7fffb317f700 (LWP 8119)]
[New Thread 0x7fffb307c700 (LWP 8120)]
[New Thread 0x7fffb2f79700 (LWP 8121)]
[New Thread 0x7fffb2e76700 (LWP 8122)]
[New Thread 0x7fffb2d73700 (LWP 8123)]
[New Thread 0x7fffb2c70700 (LWP 8124)]
[New Thread 0x7fffb2c1d700 (LWP 8125)]
[New Thread 0x7fffb2bca700 (LWP 8126)]
[New Thread 0x7fffb2b77700 (LWP 8127)]
[New Thread 0x7fffb2b24700 (LWP 8128)]
[New Thread 0x7fffb2ad1700 (LWP 8129)]
[New Thread 0x7fffb2a7e700 (LWP 8130)]
[New Thread 0x7fffb2a2b700 (LWP 8131)]
[New Thread 0x7fffb29d8700 (LWP 8132)]
[New Thread 0x7fffb2985700 (LWP 8133)]
[New Thread 0x7fffb2932700 (LWP 8134)]
[New Thread 0x7fffb28df700 (LWP 8135)]
[New Thread 0x7fffb288c700 (LWP 8136)]
[New Thread 0x7fffb2839700 (LWP 8137)]
[New Thread 0x7fffb27e6700 (LWP 8138)]
[New Thread 0x7fffb2793700 (LWP 8139)]
[New Thread 0x7fffb2740700 (LWP 8140)]
[New Thread 0x7fffb26ed700 (LWP 8141)]
[New Thread 0x7fffb269a700 (LWP 8142)]
[New Thread 0x7fffb2647700 (LWP 8143)]

Thread 11 "7_scheduler" received signal SIG35, Real-time event 35.
[Switching to Thread 0x7fffb2e76700 (LWP 8122)]
0x00007ffff7d14e3f in epoll_wait (epfd=8, events=events@REDACTED=0x7fffb72c8b60,
maxevents=maxevents@REDACTED=512, timeout=timeout@REDACTED=-1) at
../sysdeps/unix/sysv/linux/epoll_wait.c:30
30 ../sysdeps/unix/sysv/linux/epoll_wait.c: 没有那个文件或目录.
(gdb)
```

I got:
```
{"init terminating in do_boot",no_or_multiple_root_variables}
init terminating in do_boot (no_or_multiple_root_variables)

Crash dump is being written to: erl_crash.dump...
```


I must input:
(gdb) r -- -root /home/memacs/workspace/github/otp -progname
/home/memacs/workspace/github/otp/bin/cerl -- -home /home/memacs --
Starting program:
/home/memacs/workspace/github/otp/bin/x86_64-unknown-linux-gnu/beam.smp --
-root /home/memacs/workspace/github/otp -progname
/home/memacs/workspace/github/otp/bin/cerl -- -home /home/memacs --
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffb5e7f700 (LWP 8508)]
[New Thread 0x7fffb40bf700 (LWP 8509)]
[New Thread 0x7fffb5ef2700 (LWP 8510)]
[Detaching after fork from child process 8511]
[New Thread 0x7fffb36bf700 (LWP 8512)]
[New Thread 0x7fffb35bc700 (LWP 8513)]
[New Thread 0x7fffb34b9700 (LWP 8514)]
[New Thread 0x7fffb31b6700 (LWP 8515)]
[New Thread 0x7fffb33b6700 (LWP 8516)]
[New Thread 0x7fffb2e7f700 (LWP 8517)]
[New Thread 0x7fffb2d7c700 (LWP 8518)]
[New Thread 0x7fffb2c79700 (LWP 8519)]
[New Thread 0x7fffb32b3700 (LWP 8520)]
[New Thread 0x7fffb3260700 (LWP 8521)]
[New Thread 0x7fffb320d700 (LWP 8522)]
[New Thread 0x7fffb2b76700 (LWP 8523)]
[New Thread 0x7fffb2b23700 (LWP 8524)]
[New Thread 0x7fffb2ad0700 (LWP 8525)]
[New Thread 0x7fffb2a7d700 (LWP 8526)]
[New Thread 0x7fffb2a2a700 (LWP 8527)]
[New Thread 0x7fffb29d7700 (LWP 8528)]
[New Thread 0x7fffb2984700 (LWP 8529)]
[New Thread 0x7fffb2931700 (LWP 8530)]
[New Thread 0x7fffb28de700 (LWP 8531)]
[New Thread 0x7fffb288b700 (LWP 8532)]
[New Thread 0x7fffb2838700 (LWP 8533)]
[New Thread 0x7fffb27e5700 (LWP 8534)]
[New Thread 0x7fffb2792700 (LWP 8535)]
[New Thread 0x7fffb273f700 (LWP 8536)]
[New Thread 0x7fffb26ec700 (LWP 8537)]
[New Thread 0x7fffb2699700 (LWP 8538)]
[New Thread 0x7fffb2646700 (LWP 8539)]
```

Last I find the cerl script
```
gdbcmd="(insert-string \"set args $beam_args\") \
                    (comint-send-input)"
```

But emacs has not the function (insert-string xxx)
  (C-h f)
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