[Python-Dev] Best Python API for exposing posix_spawn

[Brett Cannon]

On Mon, 8 Jan 2018 at 07:57 Pablo Galindo Salgado <pablogsal at gmail.com>
wrote:

> Hi,
>
> I'm currently working on exposing posix_spawn in the posix module (and by
> extension in the os module). You can find the initial implementation in
> this PR:
>
> https://github.com/python/cpython/pull/5109
>
> As pointed out by Gregory P. Smith, some changes are needed in the way the
> file_actions arguments is passed from Python. For context, posix_spawn has
> the following declaration:
>
> int posix_spawn(pid_t *pid, const char *path,
> const posix_spawn_file_actions_t *file_actions,
> const posix_spawnattr_t *attrp,
> char *const argv[], char *const envp[]);
>
> Here, file_actions is an object that represents a list of file actions
> (open, close or dup2) that is populated using helper functions on the C API.
>
> The question is: what is the best way to deal with this argument?
>
> Following Gregory's comment on the PR I understand that he is proposing to
> have three objects in the os module representing each action and pass a
> sequence of these objects to the Python API. What I am not sure about this
> is that there is no previous example of such classes in the os module for
> other similar APIs and therefore I am not sure if there is a better
> approach.
>
> Thanks you very much for your time!
>

Any chance of using an enum?
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