Re: defuncted printf process when using wpa_supplicant
On Wed, Mar 30, 2022, 16:58 Greg Wooledge wrote: > On Wed, Mar 30, 2022 at 04:52:16PM +0200, Alex fxmbsw7 Ratchev wrote: > > cool mate i halfway understand but great peaceful explaintion :) > > The most important thing here is that zombies are mostly harmless. > They aren't using any memory or CPU. The only thing they're using is > a PID, and the kernel resources associated with that (a few dozen bytes > to store the process's "name" and so on). > > Unless there are thousands of them, you can just ignore them. > k cool >
Re: defuncted printf process when using wpa_supplicant
On Wed, Mar 30, 2022 at 04:52:16PM +0200, Alex fxmbsw7 Ratchev wrote: > cool mate i halfway understand but great peaceful explaintion :) The most important thing here is that zombies are mostly harmless. They aren't using any memory or CPU. The only thing they're using is a PID, and the kernel resources associated with that (a few dozen bytes to store the process's "name" and so on). Unless there are thousands of them, you can just ignore them.
Re: defuncted printf process when using wpa_supplicant
On Wed, Mar 30, 2022, 16:15 Chet Ramey wrote:
> On 3/30/22 1:40 AM, Alex fxmbsw7 Ratchev wrote:
> > i do
> >
> > wpa_supplicant -i"$if" -c<( printf %s\\n \
> > 'network={' "ssid=\"$ssid\"" "psk=\"$pass\"" '}'
> > ) &
> > { sleep 3 ; dhclient "$if" ; } &
> >
> > which is simply wpa_supplicant -iiface -c<( conf file printing )
> >
> > it since years resuts in such : i think before it said printf defuncted
>
> Since printf is a shell builtin, there's no way for ps to reliably
> determine the name of the command in the process substitution.
>
> > root 1530 0.0 0.0 0 0 ?Z07:19 0:00 \_
> > [3.wpa]
>
> Since the command is asynchronous, the shell forks and does word expansion
> in the subshell, at which point it creates the pipes for the process
> substitution. It then suppresses any additional forks and simply execs the
> sleep process. The shell started to run the process substitution sits there
> peacefully, not consuming any resources, until wpa_supplicant exits and
> everything gets reaped by init/systemd/whatever.
>
cool mate i halfway understand but great peaceful explaintion :)
--
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
> ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
>
Re: defuncted printf process when using wpa_supplicant
On 3/30/22 1:40 AM, Alex fxmbsw7 Ratchev wrote:
> i do
>
> wpa_supplicant -i"$if" -c<( printf %s\\n \
> 'network={' "ssid=\"$ssid\"" "psk=\"$pass\"" '}'
> ) &
> { sleep 3 ; dhclient "$if" ; } &
>
> which is simply wpa_supplicant -iiface -c<( conf file printing )
>
> it since years resuts in such : i think before it said printf defuncted
Since printf is a shell builtin, there's no way for ps to reliably
determine the name of the command in the process substitution.
> root 1530 0.0 0.0 0 0 ?Z07:19 0:00 \_
> [3.wpa]
Since the command is asynchronous, the shell forks and does word expansion
in the subshell, at which point it creates the pipes for the process
substitution. It then suppresses any additional forks and simply execs the
sleep process. The shell started to run the process substitution sits there
peacefully, not consuming any resources, until wpa_supplicant exits and
everything gets reaped by init/systemd/whatever.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
Re: defuncted printf process when using wpa_supplicant
On Wed, Mar 30, 2022, 13:53 Andreas Schwab wrote: > On Mär 30 2022, Greg Wooledge wrote: > > > If it turns out that wpa_supplicant is the parent, then that's the > > responsible party, and that's where you should send your bug reports. > > Processes don't know about process substitutions set up by the shell, > thus they cannot be resposible for them. > > $ sleep 1000 < <(cat /dev/null) & > [1] 10418 > > 10418 pts/13 S 0:00 | \_ sleep 1000 > 10419 pts/13 Z 0:00 | | \_ [cat] > i see .. -- > Andreas Schwab, sch...@linux-m68k.org > GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 > "And now for something completely different." > >
Re: defuncted printf process when using wpa_supplicant
On Mär 30 2022, Greg Wooledge wrote: > If it turns out that wpa_supplicant is the parent, then that's the > responsible party, and that's where you should send your bug reports. Processes don't know about process substitutions set up by the shell, thus they cannot be resposible for them. $ sleep 1000 < <(cat /dev/null) & [1] 10418 10418 pts/13 S 0:00 | \_ sleep 1000 10419 pts/13 Z 0:00 | | \_ [cat] -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
Re: defuncted printf process when using wpa_supplicant
On Wed, Mar 30, 2022, 13:30 Greg Wooledge wrote:
> On Wed, Mar 30, 2022 at 07:40:22AM +0200, Alex fxmbsw7 Ratchev wrote:
> > i do
> >
> > wpa_supplicant -i"$if" -c<( printf %s\\n \
> > 'network={' "ssid=\"$ssid\"" "psk=\"$pass\"" '}'
> > ) &
> > { sleep 3 ; dhclient "$if" ; } &
> >
> > which is simply wpa_supplicant -iiface -c<( conf file printing )
> >
> > it since years resuts in such : i think before it said printf defuncted
> >
> >
> > root 1528 0.0 0.0 12388 8656 ?S07:19 0:01
> > wpa_supplicant -iwlo1 -c/dev/fd/63
> > root 1530 0.0 0.0 0 0 ?Z07:19 0:00 \_
> > [3.wpa]
>
> Whatever ps command you're using here isn't showing the parent process
> ID. You'll need the parent PID to know which program isn't cleaning
> up its defunct children (zombies).
>
> The "-f" (SysV-ish) option to Linux's ps command will show it:
>
i seem not to have it, f was for tree shitt
ill see when i get to laptop
> unicorn:~$ ps -fp $$
> UID PIDPPID C STIME TTY TIME CMD
> greg 999 981 0 Mar26 pts/300:00:00 bash
>
> You appear to be using the "f" (BSD-ish) option which shows processes
> in a tree-like structure, but I can't tell from your pasted excerpt
> whether wpa_supplicant is actually the parent of the zombie, due to
> the lack of the PPID field.
>
> If it turns out that wpa_supplicant is the parent, then that's the
> responsible party, and that's where you should send your bug reports.
>
>
Re: defuncted printf process when using wpa_supplicant
On Wed, Mar 30, 2022 at 07:40:22AM +0200, Alex fxmbsw7 Ratchev wrote:
> i do
>
> wpa_supplicant -i"$if" -c<( printf %s\\n \
> 'network={' "ssid=\"$ssid\"" "psk=\"$pass\"" '}'
> ) &
> { sleep 3 ; dhclient "$if" ; } &
>
> which is simply wpa_supplicant -iiface -c<( conf file printing )
>
> it since years resuts in such : i think before it said printf defuncted
>
>
> root 1528 0.0 0.0 12388 8656 ?S07:19 0:01
> wpa_supplicant -iwlo1 -c/dev/fd/63
> root 1530 0.0 0.0 0 0 ?Z07:19 0:00 \_
> [3.wpa]
Whatever ps command you're using here isn't showing the parent process
ID. You'll need the parent PID to know which program isn't cleaning
up its defunct children (zombies).
The "-f" (SysV-ish) option to Linux's ps command will show it:
unicorn:~$ ps -fp $$
UID PIDPPID C STIME TTY TIME CMD
greg 999 981 0 Mar26 pts/300:00:00 bash
You appear to be using the "f" (BSD-ish) option which shows processes
in a tree-like structure, but I can't tell from your pasted excerpt
whether wpa_supplicant is actually the parent of the zombie, due to
the lack of the PPID field.
If it turns out that wpa_supplicant is the parent, then that's the
responsible party, and that's where you should send your bug reports.
defuncted printf process when using wpa_supplicant
i do
wpa_supplicant -i"$if" -c<( printf %s\\n \
'network={' "ssid=\"$ssid\"" "psk=\"$pass\"" '}'
) &
{ sleep 3 ; dhclient "$if" ; } &
which is simply wpa_supplicant -iiface -c<( conf file printing )
it since years resuts in such : i think before it said printf defuncted
root 1528 0.0 0.0 12388 8656 ?S07:19 0:01
wpa_supplicant -iwlo1 -c/dev/fd/63
root 1530 0.0 0.0 0 0 ?Z07:19 0:00 \_
[3.wpa]
