Date: Wed, 4 Aug 2004 00:01:42 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: ravi <ravi.nanjundappa@ap.sony.com> Cc: Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua> Subject: Re: Regarding writing to /proc entries Message-ID: <20040804050142.GB85344@dan.emsphone.com> In-Reply-To: <1091592485.4760.1.camel@ravin> References: <Pine.NEB.3.96L.1040803110533.83843A-100000@fledge.watson.org> <1091592485.4760.1.camel@ravin>
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In the last episode (Aug 04), ravi said:
> I tried with echo -n as well . But even then the same error messge is
> coming . Please tell me the solution .
For the 'note' case, a look at the source makes it clear that it has never
been implemented. The manpage also mentions it:
note Used for sending signals to the process. Not implemented.
For 'ctl', your example is invalid. At least on my system, process 2 is a
kernel thread. Try with a real userland process, and note that you cannot
trace yourself (so "echo attach > /proc/$$/ctl" will fail). For a better
ptrace interface, take a look at the ptrace() syscall. Use of procfs is
discouraged.
> > On Tue, 3 Aug 2004, ravi wrote:
> > > echo attach > /proc/2/ctl
--
Dan Nelson
dnelson@allantgroup.com
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