View/intercept all emacs lisp function calls

Question

I would like to see a log of all the emacs lisp function calls made during an emacs session.

I want to know exactly what the interpreter is doing. How can "intercept" the interpreter's REPL, if that makes any sense?

With strace I can attach to the emacs process and see all the system calls. But I need higher level information about which lisp functions are actually responsible.

As an aside, the motivation for this is to debug a problem in my emacs session where the emacs process keeps listening on a socket that is forever unavailable:

recvfrom(4, 0xbd4754, 4096, 0, 0, 0)    = -1 EAGAIN (Resource temporarily unavailable)



# netstat -p |grep 14854
unix  3      [ ]         STREAM     CONNECTED     14854    3040/emacs         

Answer 1

You can try M-x profile-start RET RET ... M-x profile-report RET. It won't give you a complete trace, but it will show you the call tree for any function that lasted enough time.

BTW, I have no idea what problem you're trying to track. Calling recvfrom and getting EAGAIN over and over again might be completely normal.

Answer 2

The Elisp info manual comes with a node

18.2.12 Trace Buffer

As stuff mentioned relies on edebug, should be a way to work from trace-point to trace-point and eventually kill.

WRT to logging, that might be done already with trace-function from trace.el.

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