[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9.5-48-g4cc40e8

[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9.5-48-g4cc40e8

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- Log -----------------------------------------------------------------
commit 4cc40e829870dd6a1d9714706d38f5fd4b2ec982
Author: Josh Stone <jistone@redhat.com>
Date:   Wed Apr 1 14:49:12 2009 -0700

    PR10016: Purge stap of all pgrp and system() usage
    
    We hereby no longer try to manipulate process groups in any way.  We
    don't set a private process group, and we never kill() our entire group
    either.  Instead of using system(), we now have a stap_system() which
    saves the child PID, so when we get a terminating signal we can pass it
    along to the child.
    
    Signals sent through the TTY have always worked, since the TTY sends it
    to the entire pgrp.  However, if we're running as part of a wrapper
    script or GUI, which may not have a separate process group for stap, we
    still would like to allow "kill -TERM $STAPPID" to terminate stap
    nicely.
    
    There's still a short window of failure in the time that staprun is
    active, because we can't kill a setuid process from a user process.
    Once staprun drops privileges and execs to stapio though, everything
    should work fine.

-----------------------------------------------------------------------

Summary of changes:
 buildrun.cxx |    8 +++---
 main.cxx     |   77 +++-------------------------------------------------------
 util.cxx     |   41 ++++++++++++++++++++++++++++---
 util.h       |    2 +
 4 files changed, 47 insertions(+), 81 deletions(-)


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systemtap: system-wide probe/trace tool