linux-kernel - Re: [PATCH 1/3] tools: timer: add rtctest

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Date:   Fri, 16 Jun 2017 17:34:38 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     john.stultz@...aro.org, tglx@...utronix.de, sboyd@...eaurora.org,
        shuah@...nel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, patrice.chotard@...com,
        a.zummo@...ertech.it, linux-arm-kernel@...ts.infradead.org,
        rtc-linux@...glegroups.com, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 1/3] tools: timer: add rtctest_setdate

Hi,

On 16/06/2017 at 16:03:51 +0200, Benjamin Gaignard wrote:
> This tool allow to set directly the time and date to a RTC device.
> 
> Unlike other tools isn't doens't use "strut timeval" or "time_t"
A small typo here-----^

> so it is safe for 32bits platforms when testing for y2038/2106 bug.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> ---
>  tools/testing/selftests/timers/Makefile          |  2 +-
>  tools/testing/selftests/timers/rtctest_setdate.c | 86 ++++++++++++++++++++++++
>  2 files changed, 87 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/timers/rtctest_setdate.c
> 
> diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
> index 5fa1d7e9..54481f1 100644
> --- a/tools/testing/selftests/timers/Makefile
> +++ b/tools/testing/selftests/timers/Makefile
> @@ -9,7 +9,7 @@ TEST_GEN_PROGS = posix_timers nanosleep nsleep-lat set-timer-lat mqueue-lat \
>  
>  TEST_GEN_PROGS_EXTENDED = alarmtimer-suspend valid-adjtimex adjtick change_skew \
>  		      skew_consistency clocksource-switch leap-a-day \
> -		      leapcrash set-tai set-2038 set-tz
> +		      leapcrash set-tai set-2038 set-tz rtctest_setdate
>  
>  
>  include ../lib.mk
> diff --git a/tools/testing/selftests/timers/rtctest_setdate.c b/tools/testing/selftests/timers/rtctest_setdate.c
> new file mode 100644
> index 0000000..2cb7848
> --- /dev/null
> +++ b/tools/testing/selftests/timers/rtctest_setdate.c
> @@ -0,0 +1,86 @@
> +/* Real Time Clock Driver Test
> + *	by: Benjamin Gaignard (benjamin.gaignard@...aro.org)
> + *
> + * To build
> + *	gcc rtctest_setdate.c -o rtctest_setdate
> + *
> + *   This program is free software: you can redistribute it and/or modify
> + *   it under the terms of the GNU General Public License as published by
> + *   the Free Software Foundation, either version 2 of the License, or
> + *   (at your option) any later version.
> + *
> + *   This program is distributed in the hope that it will be useful,
> + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *   GNU General Public License for more details.
> + */
> +
> +#include <stdio.h>
> +#include <linux/rtc.h>
> +#include <sys/ioctl.h>
> +#include <sys/time.h>
> +#include <sys/types.h>
> +#include <fcntl.h>
> +#include <unistd.h>
> +#include <stdlib.h>
> +#include <errno.h>
> +
> +static const char default_time[] = "00:00:00";
> +
> +int main(int argc, char **argv)
> +{
> +	int fd, retval;
> +	struct rtc_time new, current;
> +	const char *rtc, *date;
> +	const char *time = default_time;
> +
> +	switch (argc) {
> +	case 4:
> +		time = argv[3];
> +		/* FALLTHROUGH */
> +	case 3:
> +		date = argv[2];
> +		rtc = argv[1];
> +		break;
> +	default:
> +		fprintf(stderr, "usage: rtctest_setdate <rtcdev> <DD-MM-YYYY> [HH:MM:SS]\n");
> +		return 1;
> +	}
> +
> +	fd = open(rtc, O_RDONLY);
> +	if (fd == -1) {
> +		perror(rtc);
> +		exit(errno);
> +	}
> +
> +	sscanf(date, "%d-%d-%d", &new.tm_mday, &new.tm_mon, &new.tm_year);
> +	new.tm_mon -= 1;
> +	new.tm_year -= 1900;
> +	sscanf(time, "%d:%d:%d", &new.tm_hour, &new.tm_min, &new.tm_sec);
> +
> +	fprintf(stderr, "Test will set RTC date/time to %d-%d-%d, %02d:%02d:%02d.\n",
> +		new.tm_mday, new.tm_mon + 1, new.tm_year + 1900,
> +		new.tm_hour, new.tm_min, new.tm_sec);
> +
> +	/* Write the new date in RTC */
> +	retval = ioctl(fd, RTC_SET_TIME, &new);
> +	if (retval == -1) {
> +		perror("RTC_SET_TIME ioctl");
> +		close(fd);
> +		exit(errno);
> +	}
> +
> +	/* Read back */
> +	retval = ioctl(fd, RTC_RD_TIME, &current);
> +	if (retval == -1) {
> +		perror("RTC_RD_TIME ioctl");
> +		exit(errno);
> +	}
> +
> +	fprintf(stderr, "\n\nCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n",
> +		current.tm_mday, current.tm_mon + 1, current.tm_year + 1900,
> +		current.tm_hour, current.tm_min, current.tm_sec);
> +
> +	close(fd);
> +	return 0;
> +}
> -- 
> 1.9.1
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com