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/usr/share/psychtoolbox-3/PsychBasic/GetPID.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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function pid=GetPID

% pid=GetPID
%
% Return the process ID of the MATLAB process.  GetPID calls the POSIX
% function "getpid".  
%

PsychAssertMex;