fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<sona> i just want to know how to take command line argument using $/@ when probing userspace functions and then to use them in script
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<drsmith> sona: Arguments are describe a bit in the stap man page. But basically $1..$NNN for an unquoted value, @1...@NNN for quoted arguments
<drsmith> so you can do something like: stap -ve 'probe kernel.function(@1) { printf("%s hit\n", ppfunc()) }' 'a*'
<drsmith> to probe all kernel functions that start with the letter 'a'
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<atomlin> drsmith, is it possible to access any variables using 'kernel.statement(...).absolute' ?
<drsmith> hmm
* atomlin is wondering
<drsmith> I think you should be able to access variables in scope at that point, but I'm not 100% sure.
<drsmith> Let me look for a sec.
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<atomlin> drsmith, ack np
<fche> I doubt it - .absolute is dwarfless and dwarf-unaware
<fche> you can get at registers
<fche> some reason you're not using kernel.statement() (sans .absolute) ?
<atomlin> fche, I see
<atomlin> fche, drsmith, so kernel.statement() i.e. without .absolute is dwarf
<fche> yes
* atomlin goes to test
<fche> thus you can use functon / file names, source line #s to specify
<atomlin> fine
<atomlin> thanks
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<fche> <sona> hey..as i asked you earlier , can we use pure C,instead of embedded C in stap for string manipulating operations
<fche> embedded-c is a syntax for including C code inside a script
<fche> so inside that %{ %} you have 'pure c' -- albeit kernel-space C if you're using the default stap --runtime
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<irker524> systemtap: wcohen systemtap.git:refs/heads/master * release-3.1-45-g51be46c / bpf-base.cxx stapbpf/bpfinterp.cxx: Fix -Wimplicit-fallthrough build errors for bpf code http://tinyurl.com/lwaoo9n
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