Re: locating default signal handler for SIGSEGV

[Valdis.Kletnieks () vt edu]

On Tue, 09 Dec 2003 12:14:17 +0545, npguy said:

> DM> Can anyone tell me how can I locate the signal handler for SIGSEGV,
>
> simply call
>
>    sighandler_t signal(int signum, sighandler_t sighd);

I think what he *wanted* to know was, "While looking at an existing binary
using gdb or other debugger, how to determin whether a signal was currently set
to SIG_IGN, SIG_DFL, or the pointer to the function in the binary".  Running
the binary under 'strace' or similar will tell you if the signal is getting set
to a function (and the address of it if so).  It's quite possible that a given
program doesn't set a handler (for instance, very few programs trap SEGV) so
you *will not* find any code in the binary to do the "catch signal and dump
core", as that's being done for you by the kernel.

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