/* ADJ_FREQ Skew change test
 *		by: john stultz (johnstul@us.ibm.com)
 *		(C) Copyright IBM 2012
 *		Licensed under the GPLv2
 *
 *  NOTE: This is a meta-test which cranks the ADJ_FREQ knob and
 *  then uses other tests to detect problems. Thus this test requires
 *  that the raw_skew, inconsistency-check and nanosleep tests be
 *  present in the same directory it is run from.
 *
 *  To build:
 *	$ gcc change_skew.c -o change_skew -lrt
 *
 *   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 <stdlib.h>
#include <sys/time.h>
#include <sys/timex.h>
#include <time.h>
#ifdef KTEST
#include "../kselftest.h"
#else
static inline int ksft_exit_pass(void)
{
	exit(0);
}
static inline int ksft_exit_fail(void)
{
	exit(1);
}
#endif

#define NSEC_PER_SEC 1000000000LL


int change_skew_test(int ppm)
{
	struct timex tx;
	int ret;

	tx.modes = ADJ_FREQUENCY;
	tx.freq = ppm << 16;

	ret = adjtimex(&tx);
	if (ret < 0) {
		printf("Error adjusting freq\n");
		return ret;
	}

	ret = system("./raw_skew");
	ret |= system("./inconsistency-check");
	ret |= system("./nanosleep");

	return ret;
}


int main(int argv, char **argc)
{
	struct timex tx;
	int i, ret;

	int ppm[5] = {0, 250, 500, -250, -500};

	/* Kill ntpd */
	ret = system("killall -9 ntpd");

	/* Make sure there's no offset adjustment going on */
	tx.modes = ADJ_OFFSET;
	tx.offset = 0;
	ret = adjtimex(&tx);

	if (ret < 0) {
		printf("Maybe you're not running as root?\n");
		return -1;
	}

	for (i = 0; i < 5; i++) {
		printf("Using %i ppm adjustment\n", ppm[i]);
		ret = change_skew_test(ppm[i]);
		if (ret)
			break;
	}

	/* Set things back */
	tx.modes = ADJ_FREQUENCY;
	tx.offset = 0;
	adjtimex(&tx);

	if (ret) {
		printf("[FAIL]");
		return ksft_exit_fail();
	}
	printf("[OK]");
	return ksft_exit_pass();
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=88a7503376f4f3bf303c809d1a389739e1205614'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=88a7503376f4f3bf303c809d1a389739e1205614'>net</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='88a7503376f4f3bf303c809d1a389739e1205614'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Keith Busch &lt;keith.busch@intel.com&gt;</td><td class='right'>2017-01-18 17:21:15 -0500</td></tr>
<tr><th>committer</th><td>Jens Axboe &lt;axboe@fb.com&gt;</td><td class='right'>2017-01-18 15:14:15 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net?id=88a7503376f4f3bf303c809d1a389739e1205614'>88a7503376f4f3bf303c809d1a389739e1205614</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net?id=88a7503376f4f3bf303c809d1a389739e1205614'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=88a7503376f4f3bf303c809d1a389739e1205614'>5004e4c61099074e7832ec38e88d258275c152f2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net?id=88a7503376f4f3bf303c809d1a389739e1205614'>net</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>fa19a769f82fb9a5ca000b83cacd13fcaeda51ac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net?id=88a7503376f4f3bf303c809d1a389739e1205614&amp;id2=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>diff</a>)</td></tr></table>
<div class='commit-subject'>blk-mq: Remove unused variable</div><div class='commit-msg'>Signed-off-by: Keith Busch &lt;keith.busch@intel.com&gt;
Reviewed-by: Christoph Hellwig &lt;hch@lst.de&gt;
Reviewed-by: Sagi Grimberg &lt;sagi@grimberg.me&gt;
Signed-off-by: Jens Axboe &lt;axboe@fb.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=88a7503376f4f3bf303c809d1a389739e1205614'>Diffstat</a> (limited to 'net')</div><table summary='diffstat' class='diffstat'>