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/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-real-debug/share/petsc/matlab/@PetscOpenSocket/close.m is in libpetsc3.7.7-dbg 3.7.7+dfsg1-2build5.

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function close(sreader)
%
%   O = close(sreader) - closes the socket connection
%
sclose(sreader.fd);
sreader.fd = 0;