Hi Edward,
every subprocess that is started must be "waited on" for proper
completion, or else it never terminates and becomes a zombie.
In backend.pas, in function run_backend(), either use the option
poWaitOnExit when creating AProcess or use the method
WaitOnExit() after the output has been read from the backend.
Kind regards,
T.
On 08/29/2015 10:41 PM, Edward Bartolo wrote:
Running "ps -e" while netman runs for a some time results in zombies as follows:
edbarx@edbarx-pc:~$ ps -e
PID TTY TIME CMD
1 ? 00:00:00 init
2 ? 00:00:00 kthreadd
3 ? 00:00:05 ksoftirqd/0
5 ? 00:00:00 kworker/0:0H
7 ? 00:00:12 rcu_sched
8 ? 00:00:00 rcu_bh
9 ? 00:00:00 migration/0
10 ? 00:00:00 watchdog/0
11 ? 00:00:00 watchdog/1
12 ? 00:00:00 migration/1
13 ? 00:00:06 ksoftirqd/1
15 ? 00:00:00 kworker/1:0H
16 ? 00:00:00 khelper
17 ? 00:00:00 kdevtmpfs
18 ? 00:00:00 netns
19 ? 00:00:00 khungtaskd
20 ? 00:00:00 writeback
21 ? 00:00:00 ksmd
22 ? 00:00:00 khugepaged
23 ? 00:00:00 crypto
24 ? 00:00:00 kintegrityd
25 ? 00:00:00 bioset
26 ? 00:00:00 kblockd
29 ? 00:00:00 kswapd0
30 ? 00:00:00 fsnotify_mark
36 ? 00:00:00 kthrotld
37 ? 00:00:00 ipv6_addrconf
39 ? 00:00:00 deferwq
75 ? 00:00:00 khubd
76 ? 00:00:00 acpi_thermal_pm
77 ? 00:00:00 ata_sff
78 ? 00:00:00 scsi_eh_0
79 ? 00:00:00 scsi_tmf_0
80 ? 00:00:00 scsi_eh_1
81 ? 00:00:00 scsi_tmf_1
85 ? 00:00:00 scsi_eh_2
86 ? 00:00:00 scsi_tmf_2
87 ? 00:00:00 scsi_eh_3
88 ? 00:00:00 scsi_tmf_3
95 ? 00:00:00 kworker/1:1H
96 ? 00:00:00 kworker/0:1H
118 ? 00:00:00 jbd2/sda9-8
119 ? 00:00:00 ext4-rsv-conver
309 ? 00:00:00 udevd
359 ? 00:00:00 hd-audio0
368 ? 00:00:00 kpsmoused
389 ? 00:00:00 cfg80211
1277 ? 00:00:00 rpcbind
1305 ? 00:00:00 rpc.statd
1310 ? 00:00:00 rpciod
1312 ? 00:00:00 nfsiod
1319 ? 00:00:00 rpc.idmapd
1555 ? 00:00:00 rsyslogd
1597 ? 00:00:00 atd
1643 ? 00:00:00 acpid
1665 ? 00:00:00 cron
1726 ? 00:00:00 dbus-daemon
1919 ? 00:00:05 xchat
1965 ? 00:00:00 exim4
1985 ? 00:00:00 slim
2011 tty7 00:09:19 Xorg
2012 tty1 00:00:00 getty
2013 tty2 00:00:00 getty
2014 tty3 00:00:00 getty
2015 tty4 00:00:00 getty
2016 tty5 00:00:00 getty
2017 tty6 00:00:00 getty
2030 ? 00:00:00 kauditd
2032 ? 00:00:00 console-kit-dae
2099 ? 00:00:00 polkitd
2110 ? 00:00:00 sh
2162 ? 00:00:00 ssh-agent
2165 ? 00:00:00 dbus-launch
2166 ? 00:00:00 dbus-daemon
2176 ? 00:00:00 xfce4-session
2178 ? 00:00:00 xfconfd
2182 ? 00:00:00 gpg-agent
2183 ? 00:00:02 xfwm4
2185 ? 00:00:03 xfce4-panel
2187 ? 00:00:00 xfsettingsd
2189 ? 00:00:00 syndaemon
2191 ? 00:00:00 xfdesktop
2195 ? 00:00:00 xfce4-power-man
2199 ? 00:00:01 xscreensaver
2202 ? 00:00:00 xfce4-power-man
2203 ? 00:00:00 xfce4-volumed
2208 ? 00:00:00 upowerd
2210 ? 00:00:00 panel-6-systray
2213 ? 00:00:00 panel-2-actions
2264 ? 00:00:45 netman
2271 ? 00:00:00 backend <defunct>
2272 ? 00:00:00 cat <defunct>
2280 ? 00:00:00 ifup <defunct>
2416 ? 00:00:00 at-spi-bus-laun
2743 ? 00:00:00 kworker/1:1
3809 ? 00:00:00 kworker/0:1
4106 ? 00:00:00 kworker/u8:0
4595 ? 00:00:00 kworker/1:0
4834 ? 00:00:00 kworker/u8:2
5130 ? 00:00:00 kworker/0:2
5207 ? 00:00:00 kworker/1:2
5732 ? 00:00:00 xfce4-terminal
5736 ? 00:00:00 gnome-pty-helpe
5737 pts/0 00:00:00 bash
5755 ? 00:00:00 ps <defunct>
5756 pts/0 00:00:00 ps
7389 ? 00:00:00 ifdown <defunct>
16124 ? 00:00:00 ifup <defunct>
16135 ? 00:00:00 wpa_supplicant
16189 ? 00:00:00 dhclient
18393 ? 00:00:28 medit
26622 ? 00:00:00 backend <defunct>
26853 ? 00:00:00 backend <defunct>
26886 ? 00:00:00 backend <defunct>
26908 ? 00:00:00 backend <defunct>
31536 ? 00:08:11 iceweasel
I found this suggestion to get rid of zombies. The link is this:
https://www.daniweb.com/software-development/cpp/threads/364407/handling-sigchld-to-prevent-zombie-processes
What do you suggest?
Edward.
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