Re: [PATCH 1/6] commands: add new uptime command

[Sascha Hauer <sha@pengutronix.de>]

On Wed, Oct 26, 2022 at 08:42:00AM +0200, Ahmad Fatoum wrote:
> We have a time command to record the delta of get_time_ns() to time
> command execution, but have no command to just print get_time_ns().
> 
> Such a command can be useful to debug clocksources or to verify that a
> system is still running and hasn't been reset by a yet unhandled
> watchdog in-between.
> 
> Make development a bit easier by providing a new uptime command.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
>  commands/Kconfig  | 13 +++++++++
>  commands/Makefile |  1 +
>  commands/uptime.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 86 insertions(+)
>  create mode 100644 commands/uptime.c
> 
> diff --git a/commands/Kconfig b/commands/Kconfig
> index 2ce990b5616a..a59616ad1474 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -2289,6 +2289,19 @@ config CMD_TIME
>  	  Note: This command depends on COMMAND being interruptible,
>  	  otherwise the timer may overrun resulting in incorrect results
>  
> +config CMD_UPTIME
> +	bool "uptime"
> +	help
> +	  uptime - Tell how long barebox has been running
> +
> +	  Usage: uptime [-n]
> +
> +	  This command formats the number of elapsed nanoseconds
> +	  as measured with the current clocksource.
> +
> +	  Options:
> +	    -n		output elapsed time in nanoseconds
> +
>  config CMD_STATE
>  	tristate
>  	depends on STATE
> diff --git a/commands/Makefile b/commands/Makefile
> index 68d0d05365a5..cac1d4f2535b 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -80,6 +80,7 @@ obj-$(CONFIG_CMD_WD)		+= wd.o
>  obj-$(CONFIG_CMD_LED_TRIGGER)	+= trigger.o
>  obj-$(CONFIG_CMD_USB)		+= usb.o
>  obj-$(CONFIG_CMD_TIME)		+= time.o
> +obj-$(CONFIG_CMD_UPTIME)	+= uptime.o
>  obj-$(CONFIG_CMD_OFTREE)	+= oftree.o
>  obj-$(CONFIG_CMD_OF_DIFF)	+= of_diff.o
>  obj-$(CONFIG_CMD_OF_PROPERTY)	+= of_property.o
> diff --git a/commands/uptime.c b/commands/uptime.c
> new file mode 100644
> index 000000000000..e220fec72139
> --- /dev/null
> +++ b/commands/uptime.c
> @@ -0,0 +1,72 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <common.h>
> +#include <command.h>
> +#include <clock.h>
> +#include <linux/math64.h>
> +
> +#define NSEC_PER_MINUTE	(NSEC_PER_SEC * 60LL)
> +#define NSEC_PER_HOUR	(NSEC_PER_MINUTE * 60LL)
> +#define NSEC_PER_DAY	(NSEC_PER_HOUR * 24LL)
> +#define NSEC_PER_WEEK	(NSEC_PER_DAY * 7LL)
> +
> +static bool print_with_unit(u64 val, const char *unit, bool comma)
> +{
> +	if (!val)
> +		return comma;
> +
> +	printf("%s%llu %s%s", comma ? ", " : "", val, unit, val > 1 ? "s" : "");
> +	return true;
> +}
> +
> +static int do_uptime(int argc, char *argv[])
> +{
> +	u64 timestamp, weeks, days, hours, minutes;
> +	bool comma = false;
> +
> +	timestamp = get_time_ns();
> +
> +	if (argc == 2 && !strcmp(argv[1], "-n")) {
> +		printf("up %lluns\n", timestamp);
> +		return 0;
> +	}

Use getopt(), that's what we have it for.

Sascha


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