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;
}
/**
* Checks wether the memlock limit is unlimited
*
* @returns - 0 if the memlock limit is limited, non-0 otherwise
**/
int system_memlock_is_unlimited() {
return ((RLIM_INFINITY==system_memlock_amount())?1:0);
}
