Re: error code from afb

[<I37546_CHIN@xxxxxxxxxxxxxx>]

Hi Jose

Sorry for some misleading.
Although errors come to bindings are also useful to us, currently we'd like to know the ones come to APPs.

We understand that they mostly come from binding's reply,
But we think there are still ones come from afb itself or from base system since it uses IPC.

1. error from afb_ws_client_connect_api, afb_wsj1_call_s(when use wsj lib)
2. signals/errno from system

are maybe considerable to us.

A documentation will help us and the other APPs well if it's not difficult to do.

Thanks/BR
ChenWei
-----Original Message-----
From: José Bollo [mailto:jose.bollo@xxxxxxx] 
Sent: Wednesday, September 5, 2018 9:00 PM
To: I37546 Chin I
Cc: josé bollo; Fulup Ar Foll; Loïc Collignon [ IoT.bzh ]; automotive-discussions@xxxxxxxxxxxxxxxxxxxxxxxxx; I25461 Momiyama Yoshito
Subject: Re:  error code from afb

2018-09-05 13:18 GMT+02:00  <I37546_CHIN@xxxxxxxxxxxxxx>:
> Hi Jose
>
> We'd like to know all kinds error code come from afb to APPs,
> but we can't find the error define in afb headers
>
> Do we have an error define table? Or all the error codes are set into errno?

Hi ChenWei,

All errors are reported using errno and a meaningful code picked in
"man errno" list.

Currently the error code used are: E2BIG, EAFNOSUPPORT, EBADMSG,EBUSY,
ECONNABORTED, EEXIST, EFAULT, EFBIG, EINTR, EINVAL, ENAMETOOLONG,
ENOENT, ENOMEM, ENOTDIR, EPERM, EPIPE. Advantage of using system
predefined codes is the availability of strerror (and %m) and its
translations.

Not all of these codes are returned to bindings. Conversely, some
error reported by the system are returned directly (Think about
afb_api_rootdir_open_locale [1] that calls 'open'). Telling exactly
what error can be reported by what function shouldn't be so difficult.
It is probably a valuable documentation to add. Should we open a JIRA
issue to track that work?

This is for what bindings receive. About applications, it is different
because they receive errors from bindings, not from binder.

Best regards
José Bollo

[1] https://docs.automotivelinux.org/docs/apis_services/en/dev/reference/af-binder/reference-v3/func-api.html#afbapirootdiropenlocale

> Thanks/BR
> ChenWei
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