[PATCH] iio: event_monitor: Flush output on event

[PATCH] iio: event_monitor: Flush output on event

[Zach DeCook]

By flushing the output, iio_event_monitor can be more useful to programs
chained along with it.

  iio_event_monitor stk3310 | awk '/rising/{system("my_unlockscreen.sh")} /falling/{system("my_lockscreen.sh")}'

Without this flush, the above example would buffer a number of events,
then after a while run the lock/unlock scripts several times.

Signed-off-by: Zach DeCook <zachdecook@librem.one>
---
 tools/iio/iio_event_monitor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index 0076437f6..b94a16ba5 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -279,6 +279,7 @@ static void print_event(struct iio_event_data *event)
 		printf(", direction: %s", iio_ev_dir_text[dir]);
 
 	printf("\n");
+	fflush(stdout);
 }
 
 /* Enable or disable events in sysfs if the knob is available */
-- 
2.34.0

Re: [PATCH] iio: event_monitor: Flush output on event

[Jonathan Cameron]

On Wed,  8 Dec 2021 16:48:08 -0500
Zach DeCook <zachdecook@librem.one> wrote:

> By flushing the output, iio_event_monitor can be more useful to programs
> chained along with it.
> 
>   iio_event_monitor stk3310 | awk '/rising/{system("my_unlockscreen.sh")} /falling/{system("my_lockscreen.sh")}'
> 
> Without this flush, the above example would buffer a number of events,
> then after a while run the lock/unlock scripts several times.
> 
> Signed-off-by: Zach DeCook <zachdecook@librem.one>
Seems sensible to me.

Applied to the togreg branch of iio.git and pushed out as testing for 0-day to poke at
it (possibly - no idea what it does with tools patches :)

Jonathan

> ---
>  tools/iio/iio_event_monitor.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
> index 0076437f6..b94a16ba5 100644
> --- a/tools/iio/iio_event_monitor.c
> +++ b/tools/iio/iio_event_monitor.c
> @@ -279,6 +279,7 @@ static void print_event(struct iio_event_data *event)
>  		printf(", direction: %s", iio_ev_dir_text[dir]);
>  
>  	printf("\n");
> +	fflush(stdout);
>  }
>  
>  /* Enable or disable events in sysfs if the knob is available */