Re: EVFILT_SIGNAL - observe "standard" signals before they are delivered?
Re: EVFILT_SIGNAL - observe "standard" signals before they are delivered?
- Subject: Re: EVFILT_SIGNAL - observe "standard" signals before they are delivered?
- From: Jonas Maebe <email@hidden>
- Date: Fri, 7 Sep 2007 09:43:10 +0200
On 07 Sep 2007, at 01:19, Terry Lambert wrote:
A signal starts as a Mach exception, which can be intercepted and
averted, if you hold the exception port for the process and know
what you are doing. For example, gdb only partially knows what
it's doing; if you don't turn off "start-with-subshell", which is
on by default, for example, gdb wil hold the exception port on the
subshell rather than the process being debugged, and you will not
be able to override signals, since you will only see them in gdb
via ptrace, rather than as a Mach exception.
Does this mean that this could be used somehow as a workaround to
debug unix signals in gdb? Or is there any other workaround besides
"sleep inside your signal handler and attach with gdb only after the
signal has been triggered"?
Jonas
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