Re: Met Problem on Enable SystemTap on Android

[David Smith <dsmith at redhat dot com>]

On 09/14/2011 03:20 PM, Yao,Yanjun wrote:

> Thanks Turgis,
> 
> I got the problem fixed as what you said.
> 
> One last question, in my implementation, we want to know what system
> calls each program made. However, in SystemTap tutorial or examples,
> people already know what to probe, then they go to probe that file.
> 
> What's in my mind is like:
> probe syscall.* {
>    //print out the * part of the target "syscall.*"
> }
> 
> May I ask how can I do that?


Like this:

probe syscall.* { printf("%s: %s (%s) = ", execname(), name, argstr) }

If you want to get fancier and see the return values also, do this (this
is from testsuite/buildok/syscall.stp):

probe syscall.*, syscall.*.return {

    if (retstr != "")
	printf("%s\n", retstr)
    else
        printf("%s: %s (%s) = ", execname(), name, argstr)
}


-- 
David Smith
dsmith@redhat.com
Red Hat
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