#!/usr/bin/stap
# Copyright (C) 2014 Red Hat, Inc.
# by Josh Stone <jistone@redhat.com>
#
# pstree.stp generates a process diagram in DOT form. For instance, it may be
# useful on a 'make' command to see all the processes that are started.
#
# Run the script with:
# stap pstree.stp -c 'command_to_watch' -o output.dot
#
# Render the diagram with:
# dot -Tsvg output.dot >output.svg
probe begin
{
printf("digraph pstree {\n")
printf("rankdir=\"LR\"\n")
}
function dot_escape(str)
{
# In DOT double-quoted strings, the only escape is " to \"
return str_replace(str, "\"", "\\\"")
}
global depth
probe process.begin
{
if (!(pid() in depth)) {
depth[pid()] = 1
if (pid() != target())
printf("PID%d_%d -> PID%d_1\n", ppid(), depth[ppid()], pid())
printf("PID%d_1 [ label=\"(%d) %s\" tooltip=\"forked from %d\" ];\n",
pid(), pid(), dot_escape(execname()), ppid())
}
}
probe syscall.execve.return
{
if ($return == 0 && pid() in depth) {
d = ++depth[pid()]
printf("PID%d_%d -> PID%d_%d [ style=\"dashed\" ];\n",
pid(), d-1, pid(), d)
printf("PID%d_%d [ label=\"(%d) %s\" tooltip=\"%s\" ];\n",
pid(), d, pid(),
dot_escape(@entry(user_string($filename))),
dot_escape(cmdline_str()))
}
}
probe end
{
printf("}\n")
}
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