Re: [Tarantool-patches] [PATCH v3 1/2] sql: add missing diag_set on failure when working inside os_unix.c

[Nikita Pettik <korablev@tarantool.org>]

On 24 Dec 17:00, Vladislav Shpilevoy wrote:
> Hi! Thanks for the fixes!
> 
> See 1 comment below. After that the patchset will LGTM, and
> you can send it to Nikita on a second review.

Right away I can say that it would be super nice to see corresponding test
(using error injections I gueess). Otherwise we can't say for sure that
all this stubs are working...
 
> > diff --git a/src/box/sql/os_unix.c b/src/box/sql/os_unix.c
> > index d64f1bd..07461f5 100644
> > --- a/src/box/sql/os_unix.c
> > +++ b/src/box/sql/os_unix.c
> > @@ -873,6 +908,12 @@ unixWrite(sql_file * id, const void *pBuf, int amt, sql_int64 offset)
> >              /* lastErrno set by seekAndWrite */
> >              return -1;
> >          } else {
> > +            /* Wrote to file less than planned. */
> > +            const char *err = tt_sprintf("wrote less (%i bytes) "
> > +                             "than planned (%i bytes) "
> > +                             "to file: %s",
> > +                             wrote, amt, pFile->zPath);
> > +            diag_set(ClientError, ER_SQL_EXECUTE, err);
> 
> Planned wasn't amt, because amt is modified in the loop above. Also
> 'wrote' will be -1 here, because this branch is taked on ENOSPC and
> write() returned -1.
> 
> Perpahs it is enough to say that didn't have enough space to write
> 'amt' bytes (this is how much was left to write).
> 
> >              storeLastErrno(pFile, 0);    /* not a system error */
> >              return -1;
> >          }