From: Jeff Dike <jdike@addtoit.com>
To: Krishnappa Abhijith-A21204 <abhijith@motorola.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Regarding getpid
Date: Tue, 12 Dec 2006 09:46:48 -0500 [thread overview]
Message-ID: <20061212144648.GA4093@ccure.user-mode-linux.org> (raw)
In-Reply-To: <0A01463223B8164194908CAC85B66A1201324F53@ZMY16EXM67.ds.mot.com>
On Tue, Dec 12, 2006 at 06:12:24PM +0800, Krishnappa Abhijith-A21204 wrote:
> Ok Thanks. So actually getpid() doesn't cause mode switch.
Sure it does. Any system call does.
> But is it mandatory to execute getpid()? If yes why
That's the way ptrace traditionally works. PTRACE_SYSEMU, which came later
avoids the need to invoke some system call. It just nullifies the system
call in the expectation that the tracer will emulate it.
Jeff
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Work email - jdike at linux dot intel dot com
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prev parent reply other threads:[~2006-12-12 14:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-12 4:26 [uml-devel] Regarding getpid Krishnappa Abhijith-A21204
2006-12-12 9:49 ` Geert Uytterhoeven
2006-12-12 10:12 ` Krishnappa Abhijith-A21204
2006-12-12 14:46 ` Jeff Dike [this message]
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