PtrAccessSEGVHandler Class Reference

#include <PtrAccessSEGVHandler.h>

Collaboration diagram for PtrAccessSEGVHandler:

Public Types
typedef std::vector< void * >	accessed_t
	the list of accessed pointers More...
typedef accessed_t::const_iterator	const_iterator

Public Member Functions
const accessed_t &	accessedPtrs () const
const_iterator	beginAccessedPtrs () const
const_iterator	endAccessedPtrs () const
void	reset ()
	PtrAccessSEGVHandler (PageAccessControl &pac, size_t reservedSize=65535)
void	handle (int signal_number, siginfo_t *sigi, void *unused)
	the actual signal handler More...

Private Attributes
PageAccessControl &	m_pac
	used to restore protection of the page which segfaulted More...
accessed_t	m_accessed
	the addresses accessed since last reset More...

Detailed Description

Definition at line 28 of file PtrAccessSEGVHandler.h.

Member Typedef Documentation

accessed_t

typedef std::vector<void*> PtrAccessSEGVHandler::accessed_t

the list of accessed pointers

Definition at line 31 of file PtrAccessSEGVHandler.h.

const_iterator

typedef accessed_t::const_iterator PtrAccessSEGVHandler::const_iterator

Definition at line 32 of file PtrAccessSEGVHandler.h.

Constructor & Destructor Documentation

PtrAccessSEGVHandler()

PtrAccessSEGVHandler::PtrAccessSEGVHandler ( PageAccessControl &  pac, size_t  reservedSize = 65535  )

inline

Definition at line 38 of file PtrAccessSEGVHandler.h.

                                                                          :
    m_pac(pac) 
  {
    //we must reserve enough elements, or we risk vector allocating in a protected page during handle()...
    m_accessed.reserve(reservedSize);
  }

Member Function Documentation

accessedPtrs()

const accessed_t& PtrAccessSEGVHandler::accessedPtrs ( ) const

inline

Definition at line 33 of file PtrAccessSEGVHandler.h.

{ return m_accessed; }

beginAccessedPtrs()

const_iterator PtrAccessSEGVHandler::beginAccessedPtrs ( ) const

inline

Definition at line 34 of file PtrAccessSEGVHandler.h.

{ return m_accessed.begin(); }

endAccessedPtrs()

const_iterator PtrAccessSEGVHandler::endAccessedPtrs ( ) const

inline

Definition at line 35 of file PtrAccessSEGVHandler.h.

{ return m_accessed.end(); }

handle()

void PtrAccessSEGVHandler::handle	(	int	signal_number,
		siginfo_t *	sigi,
		void *	unused
	)

the actual signal handler

Definition at line 13 of file PtrAccessSEGVHandler.cxx.

                                                           {
    void *addr=sigi->si_addr;
#ifdef DEBUG
    printf("page fault @address=%p\n",sigi->si_addr);
#ifdef __ARCH_SI_TRAPNO
    printf("page fault trapno=%d\n",sigi->si_trapno);
#endif
    printf("page fault signo=%d\n",sigi->si_signo);
    printf("page fault errno=%d\n",sigi->si_errno);
    printf("this page fault failed because ");
    if (SEGV_MAPERR == sigi->si_code) 
      printf("you tried to access an invalid address\n");
    else if (SEGV_ACCERR == sigi->si_code) {
      printf("you tried to access a protected address\n");
    }  else printf(" an unknown reason. Page fault code=%d\n",sigi->si_code);
#endif
    //record the access and restore page protection
    if (SEGV_ACCERR == sigi->si_code) {
      m_pac.restorePageProt(addr);
      m_accessed.push_back(addr);
    } else abort();
}

reset()

void PtrAccessSEGVHandler::reset ( )

inline

Definition at line 36 of file PtrAccessSEGVHandler.h.

{ m_accessed.clear(); }

Member Data Documentation

m_accessed

accessed_t PtrAccessSEGVHandler::m_accessed

private

the addresses accessed since last reset

Definition at line 52 of file PtrAccessSEGVHandler.h.

m_pac

PageAccessControl& PtrAccessSEGVHandler::m_pac

private

used to restore protection of the page which segfaulted

Definition at line 50 of file PtrAccessSEGVHandler.h.

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The documentation for this class was generated from the following files:

• PtrAccessSEGVHandler.h
• PtrAccessSEGVHandler.cxx