/* Clocksource change test
 *		by: john stultz (johnstul@us.ibm.com)
 *		(C) Copyright IBM 2012
 *		Licensed under the GPLv2
 *
 *  NOTE: This is a meta-test which quickly changes the clocksourc and
 *  then uses other tests to detect problems. Thus this test requires
 *  that the inconsistency-check and nanosleep tests be present in the
 *  same directory it is run from.
 *
 *  To build:
 *	$ gcc clocksource-switch.c -o clocksource-switch -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 <unistd.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/timex.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/wait.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


int get_clocksources(char list[][30])
{
	int fd, i;
	size_t size;
	char buf[512];
	char *head, *tmp;

	fd = open("/sys/devices/system/clocksource/clocksource0/available_clocksource", O_RDONLY);

	size = read(fd, buf, 512);

	close(fd);

	for (i = 0; i < 30; i++)
		list[i][0] = '\0';

	head = buf;
	i = 0;
	while (head - buf < size) {
		/* Find the next space */
		for (tmp = head; *tmp != ' '; tmp++) {
			if (*tmp == '\n')
				break;
			if (*tmp == '\0')
				break;
		}
		*tmp = '\0';
		strcpy(list[i], head);
		head = tmp + 1;
		i++;
	}

	return i-1;
}

int get_cur_clocksource(char *buf, size_t size)
{
	int fd;

	fd = open("/sys/devices/system/clocksource/clocksource0/current_clocksource", O_RDONLY);

	size = read(fd, buf, size);

	return 0;
}

int change_clocksource(char *clocksource)
{
	int fd;
	ssize_t size;

	fd = open("/sys/devices/system/clocksource/clocksource0/current_clocksource", O_WRONLY);

	if (fd < 0)
		return -1;

	size = write(fd, clocksource, strlen(clocksource));

	if (size < 0)
		return -1;

	close(fd);
	return 0;
}


int run_tests(int secs)
{
	int ret;
	char buf[255];

	sprintf(buf, "./inconsistency-check -t %i", secs);
	ret = system(buf);
	if (ret)
		return ret;
	ret = system("./nanosleep");
	return ret;
}


char clocksource_list[10][30];

int main(int argv, char **argc)
{
	char orig_clk[512];
	int count, i, status;
	pid_t pid;

	get_cur_clocksource(orig_clk, 512);

	count = get_clocksources(clocksource_list);

	if (change_clocksource(clocksource_list[0])) {
		printf("Error: You probably need to run this as root\n");
		return -1;
	}

	/* Check everything is sane before we start switching asyncrhonously */
	for (i = 0; i < count; i++) {
		printf("Validating clocksource %s\n", clocksource_list[i]);
		if (change_clocksource(clocksource_list[i])) {
			status = -1;
			goto out;
		}
		if (run_tests(5)) {
			status = -1;
			goto out;
		}
	}


	printf("Running Asyncrhonous Switching Tests...\n");
	pid = fork();
	if (!pid)
		return run_tests(60);

	while (pid != waitpid(pid, &status, WNOHANG))
		for (i = 0; i < count; i++)
			if (change_clocksource(clocksource_list[i])) {
				status = -1;
				goto out;
			}
out:
	change_clocksource(orig_clk);

	if (status)
		return ksft_exit_fail();
	return ksft_exit_pass();
}
me='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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/core/seq/seq_lock.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/core/seq/seq_lock.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/core/seq/seq_lock.c'>sound/core/seq/seq_lock.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/core/seq/seq_lock.c?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/core/seq/seq_lock.c?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/core/seq/seq_lock.c?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/core/seq/seq_lock.c?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/sound/core/seq/seq_lock.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/sound/core/seq/seq_lock.c'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'sound/core/seq/seq_lock.c')</div><table summary='diffstat' class='diffstat'>