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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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Add m-esr52 at 52.6.0
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diff --git a/python/psutil/examples/pstree.py b/python/psutil/examples/pstree.py
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+++ b/python/psutil/examples/pstree.py
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+#!/usr/bin/env python
+
+# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Similar to 'ps aux --forest' on Linux, prints the process list
+as a tree structure.
+
+$ python examples/pstree.py
+0 ?
+|- 1 init
+| |- 289 cgmanager
+| |- 616 upstart-socket-bridge
+| |- 628 rpcbind
+| |- 892 upstart-file-bridge
+| |- 907 dbus-daemon
+| |- 978 avahi-daemon
+| | `_ 979 avahi-daemon
+| |- 987 NetworkManager
+| | |- 2242 dnsmasq
+| | `_ 10699 dhclient
+| |- 993 polkitd
+| |- 1061 getty
+| |- 1066 su
+| | `_ 1190 salt-minion...
+...
+"""
+
+from __future__ import print_function
+import collections
+import sys
+
+import psutil
+
+
+def print_tree(parent, tree, indent=''):
+ try:
+ name = psutil.Process(parent).name()
+ except psutil.Error:
+ name = "?"
+ print(parent, name)
+ if parent not in tree:
+ return
+ children = tree[parent][:-1]
+ for child in children:
+ sys.stdout.write(indent + "|- ")
+ print_tree(child, tree, indent + "| ")
+ child = tree[parent][-1]
+ sys.stdout.write(indent + "`_ ")
+ print_tree(child, tree, indent + " ")
+
+
+def main():
+ # construct a dict where 'values' are all the processes
+ # having 'key' as their parent
+ tree = collections.defaultdict(list)
+ for p in psutil.process_iter():
+ try:
+ tree[p.ppid()].append(p.pid)
+ except (psutil.NoSuchProcess, psutil.ZombieProcess):
+ pass
+ # on systems supporting PID 0, PID 0's parent is usually 0
+ if 0 in tree and 0 in tree[0]:
+ tree[0].remove(0)
+ print_tree(min(tree), tree)
+
+
+if __name__ == '__main__':
+ main()