Re: /proc/${PID}/cmdline parsing

On 2010-06-03 12:29:29 (+0300), Mihamina Rakotomandimby <[email protected]> wrote:
> > Joel Fernandes <[email protected]> :
> >> If I launch a 
> >>  $ watch find / -type f -name 'toto'
> >> (it's a useless command just for the example)
> >> and then I get the PID of this.
> >PID of what? watch or find?
> 
> PID of "watch"
> 
> >> When I 
> >>  $ cat /proc/${PID}/cmdline
> >>  watchfind/-typef-nametoto
> >> Yes, it's the command line, but I would like to parse it, in order to
> >> display the launched executable + its arguments.
> >> How to parse it?
> >Could you be a bit more clear with your question?
> 
> I want to split "watchfind/-typef-nametoto" (the content
> of /proc/${PID}/cmdline) to get "watch find / -type f -name toto" (the
> command I issued above)
> 
> But I cannot figure out how to split it.
> Would you know another place in the system I should look at?
> 

Running 'hexdump -C /proc/2202/cmdline' produces this:

00000000  2f 73 62 69 6e 2f 67 65  74 74 79 00 33 38 34 30 |/sbin/getty.3840|
00000010  30 00 74 74 79 31 00                             |0.tty1.|
00000017

It looks like the fields are separated by 0 bytes.
You'll simply need to read the file and split on every zero byte.

Kristof

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