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#1
06-02-2008
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Tracing self process using ptrace()
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");
Thank you, in advance. Last edited by vpraveen84; 06-02-2008 at 11:50 AM. 
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#2
06-02-2008
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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.
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