jack1/config/os/gnu-linux/sanitycheck.c

/**
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * @author Florian Faber
 *
 **/

#include <stdio.h>
#include "systemtest.h"
#include "sanitycheck.h"

int sanitycheck (int care_about_realtime,
		 int care_about_freqscaling)
{
	int errors = 0;
	int warnings = 0;
	int relogin = 0;

	if (care_about_realtime && !system_user_can_rtprio ()) {
		errors++;
		relogin++;
		fprintf (stderr, "\nJACK is running in realtime mode, but you are not allowed to use realtime scheduling.\n");

		if (!system_has_rtprio_limits_conf ()) {
			errors++;
			relogin++;
			fprintf (stderr, "Please check your /etc/security/limits.conf for the following line\n");
			fprintf (stderr, "and correct/add it if necessary:\n\n");
			fprintf (stderr, "  @audio          -       rtprio          99\n");
		} else if (!system_has_audiogroup ()) {
			errors++;
			relogin++;
			fprintf (stderr, "\nYour system has no audio group. Please add it by executing (as root):\n");
			fprintf (stderr, "  groupadd -r audio\n");
			fprintf (stderr, "  usermod -a -G audio %s\n", system_get_username ());
		} else if (!system_user_in_audiogroup ()) {
			errors++;
			relogin++;
			fprintf (stderr, "\nYour system has an audio group, but you are not a member of it.\n");
			fprintf (stderr, "Please add yourself to the audio group by executing (as root):\n");
			fprintf (stderr, "  usermod -a -G audio %s\n", system_get_username ());
		}
	}
	if (care_about_freqscaling && system_has_frequencyscaling () && system_uses_frequencyscaling ()) {
		warnings++;
		fprintf (stderr, "\n--------------------------------------------------------------------------------\n");
		fprintf (stderr, "WARNING: Your system seems to use frequency scaling.\n\n");
		fprintf (stderr, "   This can have a serious impact on audio latency. You have two choices:\n");
		fprintf (stderr, "\t(1)turn it off, e.g. by chosing the 'performance' governor.\n");
		fprintf (stderr, "\t(2)Use the HPET clocksource by passing \"-c h\" to JACK\n");
		fprintf (stderr, "\t   (this second option only works on relatively recent computers)\n");
		fprintf (stderr, "--------------------------------------------------------------------------------\n\n");
	}
	if (0 == system_memlock_amount ()) {
		errors++;
		relogin++;
		fprintf (stderr, "\nYou are not allowed to lock memory. Please add a line\n");
		fprintf (stderr, "  @audio   -  memlock    %llu\n", (system_available_physical_mem () * 3) / 4096);
		fprintf (stderr, "in your /etc/limits.conf.\n");
	}

	if (0 < relogin) {
		fprintf (stderr, "\nAfter applying these changes, please re-login in order for them to take effect.\n");
	}

	if (0 < errors) {
		fprintf (stderr, "\nYou don't appear to have a sane system configuration. It is very likely that you\n");
		fprintf (stderr, "encounter xruns. Please apply all the above mentioned changes and start jack again!\n");
	}

	return errors;
}