Programming

Kindly correct me if any of the foll is wrong:

I want to trace the current process from the C program itself which I think can be done using

ptrace(PTRACE_ATTACH,getpid(),0,0);

I would like to get control back after a segmentation fault, or arithmetric exception (i.e. all signals that end in a core dump).

If I do something like this, it doesn't work :

Code:

int status;
//other code
....
....
ptrace(PTRACE_ATTACH,getpid(),0,0);
int a=99,b=0,c;
c = a/b;
wait(&status);
if(WIFSIGNALED(status)) printf("Got control after exception");

How do I do the above ? I do not want to create a child process to monitor the signals. My aim is to create a single process solution.

Thank you, in advance.

A couple problems with this.
1. It can't be done if you service the segmentation violation
properly as a fatal error.
2.If invalid memory has been accessed and overwritten
causing the kernel to send sigsegv the program is in an
unstable state and should exit.
Further operations are no longer trustworthy as many critical
memory locations may have been altered.