[Dovecot] Rewrite the ostream output method, to save messages in another directory.

[Timo Sirainen]

On Mon, 2011-10-31 at 13:25 -0200, Alex Baule wrote:

> struct ostream *
> o_stream_create_X_list(struct ostream *output, struct istream *input, const
> char *type)
> {
> struct emexis_ostream *X_stream;
> struct ostream *new_output;
> int fd;
> 
> fd = open("/tmp/email",O_WRONLY);
> 
> new_output = o_stream_create_fd_file(fd, 0, TRUE);
> o_stream_cork(new_output);
> 
> emexis_stream = i_new(struct emexis_ostream, 1);
> emexis_stream->ostream.sendv = o_stream_X_sendv;
> emexis_stream->ostream.flush = o_stream_X_flush;
> emexis_stream->ostream.iostream.close = o_stream_X_close;
> emexis_stream->output = new_output;
> emexis_stream->input = input;
> 
> o_stream_ref(new_output);
> 
> return o_stream_create(&X_stream->ostream);
> }

This part of the code looks ok.

> With this new o_stream, i got this error.
> 
> Oct 27 15:14:24 brc dovecot: imap(alex at exemplo.com.br): Error:
> o_stream_send_istream(/storage/gss/emexis/messages/
> exemplo.com.br/alex/Maildir/.Emexis.Ext-Blacklist/tmp/1319735664.M568409P30815.brc)
> failed: Bad file descriptor

I guess this should call your o_stream_X_sendv(). What do you do in
that? I guess you're calling o_stream_sendv() for the new_output stream?
Check if it returns -1, if it does then you're somehow breaking the
new_output. Maybe you're closing it too early? Try what happens if you
create it with:

new_output = o_stream_create_fd_file(fd, 0, FALSE);

Then it doesn't automatically close the fd, and it's at least clearer if
the problem is because the stream is closed too early or if some
completely wrong fd is attempted to be used.

> There is something wrong Timo ? Like missing something or i need to rewrite
> another funcion ?

Nope. I think this is completely internal to your code.