Feature requests: list of PIDS, and all threads

Dmitry V. Levin ldv at altlinux.org
Fri Mar 9 15:17:03 UTC 2012

On Thu, Mar 08, 2012 at 12:32:12PM +0100, Denys Vlasenko wrote:
> On 03/07/2012 08:59 PM, George Spelvin wrote:
> > With multi-process and multi-threaded programs becoming more common,
> > there are a couple of things I wish strace gave me:
> >
> > 1) Some way to supply a *list* of pids to be traced, without having to
> >     prefix each with "-p".  This would make it much easier to paste
> >     in the output of "pgrep" or the like.
> >
> >     Two options come to mind:
> >     -P means "all bare arguments are pids"; the case of mixing
> >        pids and a commnd line process is somewhat uncommon.
> >     -p takes a whitespace-separated list of pids.  So I could
> >        use -p "`pgrep foo`".
> I guess we can support -p PID1,PID2 _and_ -p "PID1 PID2".
> Why not?

Of course we can, and you've implemented this with commit
v4.6-258-ge8172b7 already, but the same effect can be trivially
achieved by using sed, e.g.
strace `pgrep whatever |sed 's/^/-p /'`
so there is no real benefit for users from adding this feature.

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