gary is currently certified at Master level.

Name: Gary Benson
Member since: 2001-05-31 00:39:54
Last Login: 2012-10-24 12:18:42

FOAF RDF Share This



I work for Red Hat.


Articles Posted by gary

Recent blog entries by gary

Syndication: RSS 2.0

Infinity Full-System Preview NOW AVAILABLE

If you’ve been following Infinity and would like to, you know, download some code and try it out… well, now you can!

Syndicated 2016-06-13 11:56:25 from

Here I am casually using GDB with Infinity


Syndicated 2016-05-25 15:56:04 from

Full-system Infinity preview coming up

I’ve released bits and pieces of Infinity over the past year, but nothing that really brings everything together. Right now I’m working on an initial full-system release of everything to do with Infinity so far. It’s codenamed “First Flight”, and you’ll be able to actually use it, see how everything hangs together, and generally get a better idea of what the point of it all is.

First Flight will be just enough for GDB to attach to a live process or start with a core file. “info threads” should work, “print errno” will not. First Flight will comprise:

  • A new release of the note compiler I8C.
  • A glibc you can git clone and build to get a with Infinity notes for map_lwp2thr, thr_get_info and thr_iter.
  • A new release of the client library libi8x that can execute those notes.
  • A shim into libi8x.

The shim won’t be used in future releases—they’ll have support for Infinity built into GDB—but it’ll likely remain as a nice example of how to use libi8x.

I’m targeting June 23 as the release date for First Flight. You can follow how I’m doing on the Infinity Roadmap (thank you Sergio!)

Syndicated 2016-05-18 13:22:37 from

Infinity client library

This past few weeks I’ve been working on an Infinity client library. This is what GDB will use to execute notes it finds. It’s early days, but it executed its first note this morning so I thought I’d put something together so people can see what I’m doing. Here’s how to try it out:

  1. Install elfutils libelf development stuff if you don’t have it already, the tlsdump example program needs it:
    sudo yum install elfutils-libelf-devel  # Fedora, RHEL, etc...
    sudo apt-get install libelf-dev         # Debian, Ubuntu, etc...
  2. Download and build the Infinity client library and example program:
    git clone -b libi8x-0.0.1 libi8x-0.0.1
    cd libi8x-0.0.1
    ./configure --enable-logging --enable-debug
  3. Check the tlsdump example program built:
    bash$ ls -l examples/tlsdump
    -rwxr-xr-x. 1 gary gary 5540 Apr 20 12:52 examples/tlsdump

    Yeah, there it is! (if it’s not there go back to step 0)

  4. Build a program with notes to run the example program against:
    gcc -o tests/ifact tests/ifact.S tests/main.c
  5. Run the program you just built:
    bash$ tests/ifact &
    [2] 8301
    Hello world I'm 8301
  6. Run the libi8x tlsdump example program with the test program’s PID as it’s argument:
    $ examples/tlsdump 8301
    0! = 1
    1! = 1
    2! = 2
    3! = 6
    4! = 24
    5! = 120
    6! = 720
    7! = 5040
    8! = 40320
    9! = 362880
    10! = 3628800
    11! = 39916800
    12! = 479001600

What just happened? The executable test/ifact you built contains a single Infinity note, test::factorial(i)i, the source for which is in tests/ifact.i8. The tlsdump example located the ifact executable, loaded test::factorial(i)i from it, and ran it a few times printing the result:

  err = i8x_ctx_get_funcref (ctx, "test", "factorial", "i", "i", &fr);
  if (err != I8X_OK)
    error_i8x (ctx, err);

  err = i8x_xctx_new (ctx, 512, &xctx);
  if (err != I8X_OK)
    error_i8x (ctx, err);

  for (int i = 0; i 

To see some debug output try this:

I8X_LOG=debug examples/tlsdump PID

Also try I8X_DEBUG=true in addition to I8X_LOG=debug to trace the bytecode as it executes.

Syndicated 2016-04-20 14:21:54 from

Infinity status

I’m winding down for a month away from Infinity. The current status is that the language and note format changes for 0.0.2 are all done. You can get them with:

git clone

There’s also the beginnings of an Emacs major mode for i8 in there too. My glibc tree now has notes for td_ta_thr_iter as well as td_ta_map_lwp2thr. That’s two of the three hard ones done. Get them with:

git clone -b infinity2

FWIW td_thr_get_info is just legwork and td_thr_tls_get_addr is just a wrapper for td_thr_tlsbase; td_thr_tlsbase is the other hard note.

All notes have testcases with 100% bytecode coverage. I may add a flag for I8X to make not having 100% coverage a failure, and make glibc use it so nobody can commit notes with untested code.

The total note size so far is 720 bytes so I may still manage to get all five libpthread notes implemented in less than 1k:

Displaying notes found at file offset 0x00018f54 with length 0x000002d0:
  Owner                 Data size	Description
  GNU                  0x00000063	NT_GNU_INFINITY (inspection function)
    Signature: libpthread::__lookup_th_unique(i)ip
  GNU                  0x00000088	NT_GNU_INFINITY (inspection function)
    Signature: libpthread::map_lwp2thr(i)ip
  GNU                  0x000000cd	NT_GNU_INFINITY (inspection function)
    Signature: libpthread::__iterate_thread_list(Fi(po)oipii)ii
  GNU                  0x000000d2	NT_GNU_INFINITY (inspection function)
    Signature: libpthread::thr_iter(Fi(po)oiipi)i

Syndicated 2015-11-25 10:33:07 from

282 older entries...


gary certified others as follows:

  • gary certified mjcox as Master
  • gary certified joe as Master
  • gary certified tromey as Master
  • gary certified Anthony as Master
  • gary certified leonardr as Journeyer
  • gary certified pedro as Apprentice
  • gary certified nutella as Apprentice
  • gary certified robilad as Master
  • gary certified mjw as Master
  • gary certified timp as Journeyer
  • gary certified aph as Master
  • gary certified twisti as Master
  • gary certified avdyk as Journeyer
  • gary certified gnuandrew as Journeyer

Others have certified gary as follows:

  • chromatic certified gary as Apprentice
  • olandgren certified gary as Apprentice
  • MikeGTN certified gary as Apprentice
  • hub certified gary as Journeyer
  • jao certified gary as Apprentice
  • uweo certified gary as Apprentice
  • sye certified gary as Master
  • cannam certified gary as Journeyer
  • jooon certified gary as Apprentice
  • mike750 certified gary as Journeyer
  • hacker certified gary as Apprentice
  • sad certified gary as Journeyer
  • cdent certified gary as Apprentice
  • opiate certified gary as Journeyer
  • johnnyb certified gary as Apprentice
  • slef certified gary as Apprentice
  • jarod certified gary as Journeyer
  • maelstorm certified gary as Journeyer
  • mjcox certified gary as Journeyer
  • Ausmosis certified gary as Journeyer
  • monk certified gary as Journeyer
  • jono certified gary as Journeyer
  • fxn certified gary as Journeyer
  • ignatz certified gary as Journeyer
  • sethcohn certified gary as Journeyer
  • rupert certified gary as Journeyer
  • larry certified gary as Journeyer
  • sdodji certified gary as Journeyer
  • StevenRainwater certified gary as Journeyer
  • mharris certified gary as Journeyer
  • TheCorruptor certified gary as Journeyer
  • Ilan certified gary as Master
  • criswell certified gary as Master
  • DV certified gary as Journeyer
  • sprite certified gary as Master
  • richdawe certified gary as Journeyer
  • mulix certified gary as Journeyer
  • jrf certified gary as Journeyer
  • rkrishnan certified gary as Journeyer
  • nixnut certified gary as Journeyer
  • jcv certified gary as Journeyer
  • Omnifarious certified gary as Journeyer
  • e8johan certified gary as Journeyer
  • mjw certified gary as Journeyer
  • badvogato certified gary as Master
  • tromey certified gary as Master
  • robilad certified gary as Master
  • reenoo certified gary as Master

[ Certification disabled because you're not logged in. ]

New Advogato Features

New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.

Keep up with the latest Advogato features by reading the Advogato status blog.

If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!

Share this page