/usr/share/psychtoolbox-3/PsychLinuxConfiguration.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | function PsychLinuxConfiguration
% PsychLinuxConfiguration -- Optimize setup of Linux system.
%
% This script modifies system settings and configuration files
% to optimize a Linux system for use with Psychtoolbox.
%
% Currently it modifies files to allow to run Octave or Matlab
% as regular non-root user, ie. without need for root login or
% the "sudo" command. It does so by changing file permissions
% and resource usage limits to allow a regular user application
% to switch to realtime scheduling, lock its memory, and to
% access special purpose hardware like GPUs, Bits+, Datapixx and
% other research equipment.
%
% Realtime optimizations are achieved by extending the
% /etc/security/limits.conf file with entries that allow
% members of the Unix user group "psychtoolbox" to lock
% application memory into physical RAM, eliminating/minimizing
% interference from the VM subsystem, and to run with realtime
% priorities up to level 50. The group "psychtoolbox" is created
% if it does not already exist.
%
% If the target system has a /etc/security/limits.d/ directory,
% then a separate rule file is stored to that directory to
% achieve the change without messing around with the limits.conf
% file.
%
% root-less hardware access is achieved by copying a special
% psychtoolbox.rules file into the /etc/udev/rules.d/ directory.
% This udev rules file contains rules to auto-detect certain
% hardware at bootup or when the hw is hot-plugged and to
% reconfigure this hw or access permission for root-less access
% by Psychtoolbox, and for optimal performance for the kind
% of typical PTB use cases.
%
% The script calls into the shell via "sudo" to achieve this
% setup task, which itself needs admin privileges to modify
% system files etc. "sudo" will prompt the user for his admin
% password to complete the tasks.
%
% History:
% 6.01.2012 mk Written.
% 16.04.2013 mk Add info about 'dialout' group for serial port access.
if ~IsLinux
return;
end
% Retrieve login username of current user:
[ignore, username] = system('whoami'); %#ok<ASGLU>
username = username(1:end-1);
addgroup = 0;
% Setup of /etc/udev/rules.d/psychtoolbox.rules file, if needed:
% Assume no need to install or update:
needinstall = 0;
fprintf('\n\nLinux specific system setup for running Psychtoolbox as non-root user:\n');
fprintf('You need to be a user with administrative rights for this function to succeed.\n');
fprintf('If you don''t have administrator rights, or if you don''t trust this script to\n');
fprintf('tinker around with system settings, simply answer all questions with "n" for "No"\n');
fprintf('and then call a system administrator for help.\n\n');
fprintf('Checking if the Psychtoolbox udev rules file is installed and up to date.\n');
fprintf('This file will allow Psychtoolbox to access special research hardware equipment,\n');
fprintf('e.g., the Cambridge Research Systems Bits+ box, the Datapixx from VPixx, response\n');
fprintf('button boxes, and some special features of your graphics card, e.g., high precision\n');
fprintf('timestamping. You will be able to access this hardware without the need to run\n');
fprintf('Matlab or Octave as sudo root user.\n\n');
% Check if udev psychtoolbox.rules file exists:
if ~exist('/etc/udev/rules.d/psychtoolbox.rules', 'file')
% No: Needs to be installed.
needinstall = 1;
fprintf('The udev rules file for Psychtoolbox is not installed on your system.\n');
answer = input('Should i install it? [y/n] : ', 's');
else
% Yes.
fprintf('The udev rules file for Psychtoolbox is already installed on your system.\n');
% Compare its modification date with the one in PTB:
r = dir([PsychtoolboxRoot '/PsychBasic/psychtoolbox.rules']);
i = dir('/etc/udev/rules.d/psychtoolbox.rules');
if r.datenum > i.datenum
needinstall = 2;
fprintf('However, it seems to be outdated. I have a more recent version with me.\n');
answer = input('Should i update it? [y/n] : ', 's');
end
end
if needinstall && answer == 'y'
fprintf('I will copy my most recent rules file to your system. Please enter\n');
fprintf('now your system administrator password. You will not see any feedback.\n');
drawnow;
cmd = sprintf('sudo cp %s/PsychBasic/psychtoolbox.rules /etc/udev/rules.d/', PsychtoolboxRoot);
[rc, msg] = system(cmd);
if rc == 0
fprintf('Success! You may need to reboot your machine for some changes to take effect.\n');
else
fprintf('Failed! The error message was: %s\n', msg);
end
end
% First the fallback implementation if /etc/security/limits.d/ does not
% exist:
if ~exist('/etc/security/limits.d/', 'dir')
% Check if /etc/security/limits.conf has proper entries to allow memory locking
% and real-time scheduling:
fid = fopen('/etc/security/limits.conf');
if fid == -1
fprintf('Could not open /etc/security/limits.conf for reading. Can not set it up, sorry!\n');
return;
end
fprintf('\nChecking if /etc/security/limits.conf has entries which allow everyone to\n');
fprintf('make use of realtime scheduling and memory locking -- Needed for good timing.\n\n');
mlockok = 0;
rtpriook = 0;
while ~feof(fid)
fl = fgetl(fid);
% fprintf('%s\n', fl);
if fl == -1
continue;
end
if ~isempty(strfind(fl, 'memlock')) && ~isempty(strfind(fl, 'unlimited')) && ~isempty(strfind(fl, '@psychtoolbox')) && ~isempty(strfind(fl, '-'))
mlockok = 1;
end
if ~isempty(strfind(fl, 'rtprio')) && ~isempty(strfind(fl, '50')) && ~isempty(strfind(fl, '@psychtoolbox')) && ~isempty(strfind(fl, '-'))
rtpriook = 1;
end
end
% Done reading the file:
fclose(fid);
drawnow;
% ...and?
if ~(mlockok && rtpriook)
fprintf('\n\nThe file seems to be missing some suitable setup lines.\n');
answer = input('Should i add them for you? [y/n] : ', 's');
if answer == 'y'
fprintf('I will try to add config lines to your system. Please enter\n');
fprintf('now your system administrator password. You will not see any feedback.\n');
drawnow;
% Set amount of lockable memory to unlimited for all users:
[rc, msg] = system('sudo /bin/bash -c ''echo "@psychtoolbox - memlock unlimited" >> /etc/security/limits.conf''');
if rc ~= 0
fprintf('Failed! The error message was: %s\n', msg);
end
% Set allowable realtime priority for all users to 50:
[rc2, msg] = system('sudo /bin/bash -c ''echo "@psychtoolbox - rtprio 50" >> /etc/security/limits.conf''');
if rc2 ~= 0
fprintf('Failed! The error message was: %s\n', msg);
end
% Must add a psychtoolbox user group:
addgroup = 1;
if (rc == 0) && (rc2 == 0)
fprintf('\n\nSuccess!\n\n');
else
fprintf('\n\nFailed! Maybe ask a system administrator for help?\n\n');
end
end
else
fprintf('\n\nYour system is already setup for use of Priority().\n\n');
end
else
% Realtime setup for systems with /etc/security/limits.d/ directory:
% Simply install a ptb specific config file - a cleaner solution:
if ~exist('/etc/security/limits.d/99-psychtoolboxlimits.conf', 'file')
fprintf('\n\nThe file /etc/security/limits.d/99-psychtoolboxlimits.conf is\n');
fprintf('not yet installed on your system. It allows painless realtime operation.\n');
answer = input('Should i install the file for you? [y/n] : ', 's');
if answer == 'y'
fprintf('I will try to install it now to your system. Please enter\n');
fprintf('now your system administrator password. You will not see any feedback.\n');
drawnow;
cmd = sprintf('sudo cp %s/PsychBasic/99-psychtoolboxlimits.conf /etc/security/limits.d/', PsychtoolboxRoot);
[rc, msg] = system(cmd);
if rc ~= 0
fprintf('Failed! The error message was: %s\n', msg);
else
fprintf('Success!\n\n');
% Must add a psychtoolbox user group:
addgroup = 1;
end
end
end
end
% Need to create a Unix user group 'psychtoolbox' and add user to it?
if addgroup
% This will create the psychtoolbox user group, unless the group
% already exists. In such a case it simply does nothing:
system('sudo groupadd --force psychtoolbox');
fprintf('I have created a new Unix user group called "psychtoolbox" on your system.\n');
else
fprintf('\n\nYour system has a Unix user group called "psychtoolbox".\n');
end
fprintf('All members of that group can use the Priority() command now without the need\n');
fprintf('to run Matlab or Octave as sudo root user.\n\n');
fprintf('You need to add each user of Psychtoolbox to that group. You could do this\n');
fprintf('with the user management tools of your system. Or you can open a terminal window\n');
fprintf('and type the following command (here as an example to add yourself to that group):\n\n');
fprintf('sudo usermod -a -G psychtoolbox %s\n\n', username);
fprintf('One should also add oneself to the ''dialout'' group for access to serial port devices:\n\n');
fprintf('sudo usermod -a -G dialout %s\n\n', username);
fprintf('After that, the new group member must log out and then login again for the\n');
fprintf('settings to take effect.\n\n');
fprintf('\nFinished. Your system should now be ready for use with Psychtoolbox.\n');
fprintf('If you encounter problems, try rebooting the machine. Some of the settings only\n');
fprintf('become effective after a reboot.\n\n\n');
fprintf('Press any key to continue.\n');
pause;
fprintf('\n\n\n');
return;
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