[lttng-dev] [PATCH] Fix I/O-related error values in ustctl

[Mathieu Desnoyers]

* David Goulet (dgoulet at efficios.com) wrote:
> Acked-by: David Goulet <dgoulet at efficios.com>

merged into master branch and stable-2.1.

Thanks,

Mathieu

> 
> Mathieu Desnoyers:
> > These internal ustctl API members document >=0 as OK values. Make sure
> > reply recv errors are returned as errors.
> > 
> > Clarify ustctl_create_stream() error values.
> > 
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
> > ---
> > diff --git a/include/lttng/ust-ctl.h b/include/lttng/ust-ctl.h
> > index c2b255c..11beaba 100644
> > --- a/include/lttng/ust-ctl.h
> > +++ b/include/lttng/ust-ctl.h
> > @@ -23,7 +23,7 @@
> >  
> >  /*
> >   * Error values: all the following functions return:
> > - * >= 0: Sucess (LTTNG_UST_OK)
> > + * >= 0: Success (LTTNG_UST_OK)
> >   * < 0: error code.
> >   */
> >  int ustctl_register_done(int sock);
> > @@ -34,8 +34,6 @@ int ustctl_open_metadata(int sock, int session_handle,
> >  int ustctl_create_channel(int sock, int session_handle,
> >  		struct lttng_ust_channel_attr *chops,
> >  		struct lttng_ust_object_data **channel_data);
> > -int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data,
> > -		struct lttng_ust_object_data **stream_data);
> >  int ustctl_create_event(int sock, struct lttng_ust_event *ev,
> >  		struct lttng_ust_object_data *channel_data,
> >  		struct lttng_ust_object_data **event_data);
> > @@ -51,6 +49,15 @@ int ustctl_start_session(int sock, int handle);
> >  int ustctl_stop_session(int sock, int handle);
> >  
> >  /*
> > + * Return -ENOENT if no more stream is available for creation.
> > + * Return 0 on success.
> > + * Return negative error value on system error.
> > + * Return positive error value on UST error.
> > + */
> > +int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data,
> > +		struct lttng_ust_object_data **stream_data);
> > +
> > +/*
> >   * ustctl_tracepoint_list returns a tracepoint list handle, or negative
> >   * error value.
> >   */
> > diff --git a/liblttng-ust-comm/lttng-ust-comm.c b/liblttng-ust-comm/lttng-ust-comm.c
> > index 9a67ea1..db9910d 100644
> > --- a/liblttng-ust-comm/lttng-ust-comm.c
> > +++ b/liblttng-ust-comm/lttng-ust-comm.c
> > @@ -435,7 +435,10 @@ int ustcomm_send_app_cmd(int sock,
> >  	ret = ustcomm_send_app_msg(sock, lum);
> >  	if (ret)
> >  		return ret;
> > -	return ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd);
> > +	ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd);
> > +	if (ret > 0)
> > +		return -EIO;
> > +	return ret;
> >  }
> >  
> >  /*
> > 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com