| From: "Dale Dunlea" <daledunlea at commergy.com>
| Date: Tue, 7 Dec 2004 13:36:20 -0000
| > man ptrace
| Right, I've had a look at that, and I'm using PTRACE_ATTACH.
| The thing is, when my program tries to attach to the running
| process, said process seems to halt.
this is correct. (_read_ the man page!)
and yer problem is....?
as others have pointed out, yer doing something
quite strange; and as Pádraig is hinting, this
can be quite hard to make robust. also, the
original description was slightly muddled, but
the ghist seems to be that if some process Þ is
orphaned, then a (new) process is to be notified
via SIGCHLD if (when) þ terminates. to emphasise
Pádraig's point, that whole _idea_ is filled full
of some nasty race conditions and security issues.
methinks you should rethink yer algorithm.
and a few more details would help.
| > Can you guarantee the pid will be correct.
| > I.E. can you guarantee the child process didn't
| > itself die and another process now holds the PID?
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