Regarding stack analysis Post: 302208042

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Top Forums Programming Regarding stack analysis Post 302208042 by vpraveen84 on Sunday 22nd of June 2008 07:48:43 PM

06-22-2008

Registered User

Regarding stack analysis

I would like to know how I could do the following :

Code:

void func(){
  int a = 100; b=0;
  int c = a/b;
}

void sig_handler (int sig,siginfo_t *info,void *context){
//signal handling function
//here I want to access the variables of func() 
}
  
int main(){
  struct sigaction *act = (struct sigaction *)malloc(sizeof(struct sigaction));
  act->sa_flags = SA_SIGINFO;
  act->sa_sigaction = sig_handler; 
  sigaction(SIGFPE,act,NULL); 
  func();
}

As expected, this program should give an exception. But I use sigaction to catch the signal (arithmetric exception) and send control to another function(sig_handler), where I want to handle this signal.

I would like to access the variables inside func() and modify them. How can I do this ?

thank you,

Last edited by vpraveen84; 06-22-2008 at 10:54 PM..

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LEARN ABOUT NETBSD

child_return

CPU_LWP_FORK(9) 					   BSD Kernel Developer's Manual					   CPU_LWP_FORK(9)

NAME

     cpu_lwp_fork, child_return, proc_trampoline -- finish a fork operation

SYNOPSIS

     #include <sys/proc.h>

     void
     cpu_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize, void (*func)(void *), void *arg);

     void
     child_return(void *arg);

DESCRIPTION

     cpu_lwp_fork() is the machine-dependent portion of fork1() which finishes a fork operation, with child lwp l2 nearly set up.  It copies and
     updates the PCB and trap frame from the parent l1, making the child ready to run.

     cpu_lwp_fork() rigs the child's kernel stack so that it will start in proc_trampoline().  proc_trampoline() does not have a normal calling
     sequence and is entered by cpu_switch().  If an alternate user-level stack is requested (with non-zero values in both the stack and stacksize
     arguments), the user stack pointer is set up accordingly.

     After being entered by cpu_switch() and while running in user context (within the kernel) proc_trampoline() will invoke the function func
     with the argument arg.  If a kernel thread is being created, the return path and argument are specified with func and arg.  If a user process
     is being created, fork1() will pass child_return() and l2 to cpu_lwp_fork() as func and arg respectively.	This causes the newly-created
     child process to go directly to user level with an apparent return value of 0 from fork(2), while the parent process returns normally.

SEE ALSO

     fork(2), cpu_switchto(9), fork1(9)

BSD
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