/usr/share/systemtap/tapset/switchfile.stp is in systemtap-common 3.1-3ubuntu0.1.
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 | // File switching tapset
// Copyright (C) 2015 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
/**
* sfunction switch_file - switch to the next output file
*
* Description: This function sends a signal to the stapio process,
* commanding it to rotate to the next output file when output is
* sent to file(s).
*/
function switch_file() {
if (stp_pid() != 0) {
system(sprintf("kill -USR2 %d", stp_pid()))
}
}
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