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Subject:	sigaction siginfo_t & SIGSEGV
Date:	Tue, 21 Jan 2003 21:00:08 -0500
Message-ID:	<83040F98B407E6428FEC18AC720F5D732DB7A1@exchange.tropicnetworks.com>
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From:	"Rolf Campbell" <rcampbell AT tropicnetworks DOT com>
To:	<cygwin AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id h0M20dZ00785

I'm trying to write an application that can run some code when a certain
memory address is read or written.  
My first theory was to use mprotect to remove read/write permissions
from a section and then catch SIGSEGV, but siginfo_t doesn't seem to be
defined.
Is hooking a signal using the 'sa_sigaction' member of 'struct
sigaction' supported in CygWin?

I noticed that struct siginfo_t is declared in sys/signal.h, but inside
a couple of #ifdef:
#if defined(__rtems__)
#if defined(_POSIX_REALTIME_SIGNALS)

And it doesn't have the member that I need anyways (si_addr).

Does anyone know of any other ways of trapping reads/writes to/from
memory regions?


-Rolf Campbell
Software Designer
Tropic Networks

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