[Bug general/4256] New: Monitor library calls as well as system calls

[Bug general/4256] New: Monitor library calls as well as system calls

[fkung at redhat dot com]

Rather than only showing system calls in the monitor, it would be a nice feature
to monitor library calls as well.  It would be an extremely useful supplement to
backtraces when debugging a problem.

To reduce verbosity, a filter can be added so that only calls into specified
libraries are logged.

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           Summary: Monitor library calls as well as system calls
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: fkung at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4256

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[Bug general/4256] Monitor library calls as well as system calls

[swagiaal at redhat dot com]

------- Additional Comments From swagiaal at redhat dot com  2007-03-22 17:56 -------
Yes. This is definatly a vaid functionality. One way we plan to address this is
through something called tag sets. Basically you instrument your souce code, or
the source code of a library with check points. These check points then cause
the monitor to draw events when they are reached during execution.

People can then share TagSets for library foo.so.

Anyone have any other ways for monitoring library calls ?.. is a library call
any different from a regular function call after the library has been loaded ?

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           What    |Removed                     |Added
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                 CC|                            |swagiaal at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4256

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[Bug general/4256] Monitor library calls as well as system calls

[cagney at redhat dot com]

------- Additional Comments From cagney at redhat dot com  2007-03-22 18:03 -------
> Anyone have any other ways for monitoring library calls ?.. is a library call
> any different from a regular function call after the library has been loaded ?

Identical.

(well sometimes its a call through a function pointer, and sometimes through a
"thunk").

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=4256

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[Bug general/4256] Monitor library calls as well as system calls

[swagiaal at redhat dot com]

------- Additional Comments From swagiaal at redhat dot com  2007-03-22 19:32 -------
This is done by ltrace (http://packages.debian.org/unstable/source/ltrace)
thanks to cagney for the pointer.

I couldnt quickly tell from the code but one possibility is that it monitors all
library loads then sets breakpoints on all the functions of a library as soon as
it is loaded.

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http://sourceware.org/bugzilla/show_bug.cgi?id=4256

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