Re: [PATCH v2] dvb_dev_get_fd(): return fd of local devices

[Mauro Carvalho Chehab <mchehab@s-opensource.com>]

Em Wed, 15 Nov 2017 15:25:39 +0100
Rafaël Carré <funman@videolan.org> escreveu:

> This makes it possible to poll a local device.
> Getting the fd is preferrable to adding a dvb_dev_poll() function,
> because we can poll several fds together in an event-based program.
> 
> This is not implemented for remote devices, as polling a remote fd
> does not make sense.
> We could instead return the socket to know when to expect messages
> from the remote device, but the current implementation in
> dvb-dev-remote.c already runs a thread to receive remote messages
> as soon as possible.

SOB?

> ---
> v2: get the private dvb_device_priv correctly
> 
>  lib/include/libdvbv5/dvb-dev.h | 12 ++++++++++++
>  lib/libdvbv5/dvb-dev-local.c   |  6 ++++++
>  lib/libdvbv5/dvb-dev-priv.h    |  1 +
>  lib/libdvbv5/dvb-dev.c         | 11 +++++++++++
>  4 files changed, 30 insertions(+)
> 
> diff --git a/lib/include/libdvbv5/dvb-dev.h b/lib/include/libdvbv5/dvb-dev.h
> index 98bee5e7..55e0f065 100644
> --- a/lib/include/libdvbv5/dvb-dev.h
> +++ b/lib/include/libdvbv5/dvb-dev.h
> @@ -289,6 +289,18 @@ struct dvb_open_descriptor *dvb_dev_open(struct dvb_device *dvb,
>   */
>  void dvb_dev_close(struct dvb_open_descriptor *open_dev);
>  
> +/**
> + * @brief returns fd from a local device
> + * This will not work for remote devices.
> + * @ingroup dvb_device
> + *
> + * @param open_dev	Points to the struct dvb_open_descriptor
> + *
> + * @return On success, returns the fd.
> + * Returns -1 on error.
> + */
> +int dvb_dev_get_fd(struct dvb_open_descriptor *open_dev);
> +
>  /**
>   * @brief read from a dvb demux or dvr file
>   * @ingroup dvb_device
> diff --git a/lib/libdvbv5/dvb-dev-local.c b/lib/libdvbv5/dvb-dev-local.c
> index b50b61b4..eb2f0775 100644
> --- a/lib/libdvbv5/dvb-dev-local.c
> +++ b/lib/libdvbv5/dvb-dev-local.c
> @@ -775,6 +775,11 @@ static void dvb_dev_local_free(struct dvb_device_priv *dvb)
>  	free(priv);
>  }
>  
> +static int dvb_local_get_fd(struct dvb_open_descriptor *open_dev)
> +{
> +    return open_dev->fd;
> +}
> +
>  /* Initialize for local usage */
>  void dvb_dev_local_init(struct dvb_device_priv *dvb)
>  {
> @@ -788,6 +793,7 @@ void dvb_dev_local_init(struct dvb_device_priv *dvb)
>  	ops->stop_monitor = dvb_local_stop_monitor;
>  	ops->open = dvb_local_open;
>  	ops->close = dvb_local_close;
> +	ops->get_fd = dvb_local_get_fd;
>  
>  	ops->dmx_stop = dvb_local_dmx_stop;
>  	ops->set_bufsize = dvb_local_set_bufsize;
> diff --git a/lib/libdvbv5/dvb-dev-priv.h b/lib/libdvbv5/dvb-dev-priv.h
> index e05fcad2..2e69f766 100644
> --- a/lib/libdvbv5/dvb-dev-priv.h
> +++ b/lib/libdvbv5/dvb-dev-priv.h
> @@ -72,6 +72,7 @@ struct dvb_dev_ops {
>  	int (*fe_get_stats)(struct dvb_v5_fe_parms *p);
>  
>  	void (*free)(struct dvb_device_priv *dvb);
> +	int (*get_fd)(struct dvb_open_descriptor *dvb);
>  };
>  
>  struct dvb_device_priv {
> diff --git a/lib/libdvbv5/dvb-dev.c b/lib/libdvbv5/dvb-dev.c
> index 7e2da1fb..e6a8fc76 100644
> --- a/lib/libdvbv5/dvb-dev.c
> +++ b/lib/libdvbv5/dvb-dev.c
> @@ -218,6 +218,17 @@ struct dvb_open_descriptor *dvb_dev_open(struct dvb_device *d,
>  	return ops->open(dvb, sysname, flags);
>  }
>  
> +int dvb_dev_get_fd(struct dvb_open_descriptor *open_dev)
> +{
> +	struct dvb_device_priv *dvb = open_dev->dvb;
> +	struct dvb_dev_ops *ops = &dvb->ops;
> +
> +	if (!ops->get_fd)
> +		return -1;
> +
> +	return ops->get_fd(open_dev);
> +}
> +
>  void dvb_dev_close(struct dvb_open_descriptor *open_dev)
>  {
>  	struct dvb_device_priv *dvb = open_dev->dvb;



Thanks,
Mauro