Catching access violation exceptions

Question

Example  int  ptr   ptr   1000    can I catch memory access violation exception using standard C   without using any microsoft specific

User · Answer

This type of situation is implementation dependent and consequently it will require a vendor specific mechanism in order to trap. With Microsoft this will involve SEH, and *nix will involve a signal

In general though catching an Access Violation exception is a very bad idea. There is almost no way to recover from an AV exception and attempting to do so will just lead to harder to find bugs in your program.

User · Answer

This type of situation is implementation dependent and consequently it will require a vendor specific mechanism in order to trap. With Microsoft this will involve SEH, and *nix will involve a signal

In general though catching an Access Violation exception is a very bad idea. There is almost no way to recover from an AV exception and attempting to do so will just lead to harder to find bugs in your program.

User · Answer

This type of situation is implementation dependent and consequently it will require a vendor specific mechanism in order to trap. With Microsoft this will involve SEH, and *nix will involve a signal

In general though catching an Access Violation exception is a very bad idea. There is almost no way to recover from an AV exception and attempting to do so will just lead to harder to find bugs in your program.

User · Answer

As stated  there is no non Microsoft   compiler vendor way to do this on the windows platform  However  it is obviously useful to catch these types of exceptions in the normal try     catch  exception ex      way for error reporting and more a graceful exit of your app  as JaredPar says  the app is now probably in trouble   We use  se translator function in a simple class wrapper that allows us to catch the following exceptions in a a try handler   DECLARE EXCEPTION CLASS datatype misalignment  DECLARE EXCEPTION CLASS breakpoint  DECLARE EXCEPTION CLASS single step  DECLARE EXCEPTION CLASS array bounds exceeded  DECLARE EXCEPTION CLASS flt denormal operand  DECLARE EXCEPTION CLASS flt divide by zero  DECLARE EXCEPTION CLASS flt inexact result  DECLARE EXCEPTION CLASS flt invalid operation  DECLARE EXCEPTION CLASS flt overflow  DECLARE EXCEPTION CLASS flt stack check  DECLARE EXCEPTION CLASS flt underflow  DECLARE EXCEPTION CLASS int divide by zero  DECLARE EXCEPTION CLASS int overflow  DECLARE EXCEPTION CLASS priv instruction  DECLARE EXCEPTION CLASS in page error  DECLARE EXCEPTION CLASS illegal instruction  DECLARE EXCEPTION CLASS noncontinuable exception  DECLARE EXCEPTION CLASS stack overflow  DECLARE EXCEPTION CLASS invalid disposition  DECLARE EXCEPTION CLASS guard page  DECLARE EXCEPTION CLASS invalid handle  DECLARE EXCEPTION CLASS microsoft cpp    The original class came from this very useful article   http   www codeproject com KB cpp exception aspx

User · Answer

There is a very easy way to catch any kind of exception  division by zero  access violation  etc   in Visual Studio using try -  catch       block  A minor project settings tweaking is enough  Just enable  EHa option in the project settings  See Project Properties -  C C   -  Code Generation -  Modify the Enable C   Exceptions to  Yes With SEH Exceptions   That s it   See details here  http   msdn microsoft com en-us library 1deeycx5 v vs 80  aspx

User · Answer

Not the exception handling mechanism  But you can use the signal   mechanism that is provided by the C    gt  man signal       11    SIGSEGV      create core image    segmentation violation   Writing to a NULL pointer is probably going to cause a SIGSEGV signal

User · Answer

Not the exception handling mechanism  But you can use the signal   mechanism that is provided by the C    gt  man signal       11    SIGSEGV      create core image    segmentation violation   Writing to a NULL pointer is probably going to cause a SIGSEGV signal

User · Answer

As stated  there is no non Microsoft   compiler vendor way to do this on the windows platform  However  it is obviously useful to catch these types of exceptions in the normal try     catch  exception ex      way for error reporting and more a graceful exit of your app  as JaredPar says  the app is now probably in trouble   We use  se translator function in a simple class wrapper that allows us to catch the following exceptions in a a try handler   DECLARE EXCEPTION CLASS datatype misalignment  DECLARE EXCEPTION CLASS breakpoint  DECLARE EXCEPTION CLASS single step  DECLARE EXCEPTION CLASS array bounds exceeded  DECLARE EXCEPTION CLASS flt denormal operand  DECLARE EXCEPTION CLASS flt divide by zero  DECLARE EXCEPTION CLASS flt inexact result  DECLARE EXCEPTION CLASS flt invalid operation  DECLARE EXCEPTION CLASS flt overflow  DECLARE EXCEPTION CLASS flt stack check  DECLARE EXCEPTION CLASS flt underflow  DECLARE EXCEPTION CLASS int divide by zero  DECLARE EXCEPTION CLASS int overflow  DECLARE EXCEPTION CLASS priv instruction  DECLARE EXCEPTION CLASS in page error  DECLARE EXCEPTION CLASS illegal instruction  DECLARE EXCEPTION CLASS noncontinuable exception  DECLARE EXCEPTION CLASS stack overflow  DECLARE EXCEPTION CLASS invalid disposition  DECLARE EXCEPTION CLASS guard page  DECLARE EXCEPTION CLASS invalid handle  DECLARE EXCEPTION CLASS microsoft cpp    The original class came from this very useful article   http   www codeproject com KB cpp exception aspx

User · Answer

A violation like that means that there s something seriously wrong with the code  and it s unreliable   I can see that a program might want to try to save the user s data in a way that one hopes won t write over previous data  in the hope that the user s data isn t already corrupted  but there is by definition no standard method of dealing with undefined behavior

User · Answer

Nope  C   does not throw an exception when you do something bad  that would incur a performance hit  Things like access violations or division by zero errors are more like  machine  exceptions  rather than language-level things that you can catch

User · Answer

A violation like that means that there s something seriously wrong with the code  and it s unreliable   I can see that a program might want to try to save the user s data in a way that one hopes won t write over previous data  in the hope that the user s data isn t already corrupted  but there is by definition no standard method of dealing with undefined behavior

User · Answer

Not the exception handling mechanism  But you can use the signal   mechanism that is provided by the C    gt  man signal       11    SIGSEGV      create core image    segmentation violation   Writing to a NULL pointer is probably going to cause a SIGSEGV signal

User · Answer

Nope  C   does not throw an exception when you do something bad  that would incur a performance hit  Things like access violations or division by zero errors are more like  machine  exceptions  rather than language-level things that you can catch

User · Answer

As stated  there is no non Microsoft   compiler vendor way to do this on the windows platform  However  it is obviously useful to catch these types of exceptions in the normal try     catch  exception ex      way for error reporting and more a graceful exit of your app  as JaredPar says  the app is now probably in trouble   We use  se translator function in a simple class wrapper that allows us to catch the following exceptions in a a try handler   DECLARE EXCEPTION CLASS datatype misalignment  DECLARE EXCEPTION CLASS breakpoint  DECLARE EXCEPTION CLASS single step  DECLARE EXCEPTION CLASS array bounds exceeded  DECLARE EXCEPTION CLASS flt denormal operand  DECLARE EXCEPTION CLASS flt divide by zero  DECLARE EXCEPTION CLASS flt inexact result  DECLARE EXCEPTION CLASS flt invalid operation  DECLARE EXCEPTION CLASS flt overflow  DECLARE EXCEPTION CLASS flt stack check  DECLARE EXCEPTION CLASS flt underflow  DECLARE EXCEPTION CLASS int divide by zero  DECLARE EXCEPTION CLASS int overflow  DECLARE EXCEPTION CLASS priv instruction  DECLARE EXCEPTION CLASS in page error  DECLARE EXCEPTION CLASS illegal instruction  DECLARE EXCEPTION CLASS noncontinuable exception  DECLARE EXCEPTION CLASS stack overflow  DECLARE EXCEPTION CLASS invalid disposition  DECLARE EXCEPTION CLASS guard page  DECLARE EXCEPTION CLASS invalid handle  DECLARE EXCEPTION CLASS microsoft cpp    The original class came from this very useful article   http   www codeproject com KB cpp exception aspx

User · Answer

At least for me  the signal SIGSEGV      approach mentioned in another answer did not work on Win32 with Visual C   2015  What did work for me was to use  set se translator   found in eh h  It works like this   Step 1  Make sure you enable Yes with SEH Exceptions   EHa  in Project Properties   C     Code Generation   Enable C   Exceptions  as mentioned in the answer by Volodymyr Frytskyy   Step 2  Call  set se translator    passing in a function pointer  or lambda  for the new exception translator  It is called a translator because it basically just takes the low-level exception and re-throws it as something easier to catch  such as std  exception    include  lt string gt   include  lt eh h gt      Be sure to enable  Yes with SEH Exceptions   EHa   in C     Code Generation   set se translator    unsigned int u  EXCEPTION POINTERS  pExp        std  string error    SE Exception         switch  u        case 0xC0000005          error     Access Violation           break      default          char result 11           sprintf s result  11   0x 08X   u           error    result             throw std  exception error c str           Step 3  Catch the exception like you normally would   try      MakeAnException      catch std  exception ex       HandleIt

User · Answer

Nope  C   does not throw an exception when you do something bad  that would incur a performance hit  Things like access violations or division by zero errors are more like  machine  exceptions  rather than language-level things that you can catch

User · Answer

Not the exception handling mechanism  But you can use the signal   mechanism that is provided by the C    gt  man signal       11    SIGSEGV      create core image    segmentation violation   Writing to a NULL pointer is probably going to cause a SIGSEGV signal

User · Answer

As stated  there is no non Microsoft   compiler vendor way to do this on the windows platform  However  it is obviously useful to catch these types of exceptions in the normal try     catch  exception ex      way for error reporting and more a graceful exit of your app  as JaredPar says  the app is now probably in trouble   We use  se translator function in a simple class wrapper that allows us to catch the following exceptions in a a try handler   DECLARE EXCEPTION CLASS datatype misalignment  DECLARE EXCEPTION CLASS breakpoint  DECLARE EXCEPTION CLASS single step  DECLARE EXCEPTION CLASS array bounds exceeded  DECLARE EXCEPTION CLASS flt denormal operand  DECLARE EXCEPTION CLASS flt divide by zero  DECLARE EXCEPTION CLASS flt inexact result  DECLARE EXCEPTION CLASS flt invalid operation  DECLARE EXCEPTION CLASS flt overflow  DECLARE EXCEPTION CLASS flt stack check  DECLARE EXCEPTION CLASS flt underflow  DECLARE EXCEPTION CLASS int divide by zero  DECLARE EXCEPTION CLASS int overflow  DECLARE EXCEPTION CLASS priv instruction  DECLARE EXCEPTION CLASS in page error  DECLARE EXCEPTION CLASS illegal instruction  DECLARE EXCEPTION CLASS noncontinuable exception  DECLARE EXCEPTION CLASS stack overflow  DECLARE EXCEPTION CLASS invalid disposition  DECLARE EXCEPTION CLASS guard page  DECLARE EXCEPTION CLASS invalid handle  DECLARE EXCEPTION CLASS microsoft cpp    The original class came from this very useful article   http   www codeproject com KB cpp exception aspx

User · Answer

This type of situation is implementation dependent and consequently it will require a vendor specific mechanism in order to trap. With Microsoft this will involve SEH, and *nix will involve a signal

In general though catching an Access Violation exception is a very bad idea. There is almost no way to recover from an AV exception and attempting to do so will just lead to harder to find bugs in your program.

User · Answer

Read it and weep   I figured it out  If you don t throw from the handler  the handler will just continue and so will the exception   The magic happens when you throw you own exception and handle that    include  stdafx h   include  lt stdio h gt   include  lt stdlib h gt   include  lt signal h gt   include  lt tchar h gt   void SignalHandler int signal        printf  Signal  d  signal       throw   Access Violation       int main         typedef void   SignalHandlerPointer  int        SignalHandlerPointer previousHandler      previousHandler   signal SIGSEGV   SignalHandler       try            int    0   0    Baaaaaaad thing that should never be caught  You should write good code in the first place            catch char  e                printf  Exception Caught   s n  e             printf  Now we continue  unhindered  like the abomination never happened   I am an EVIL genius  n        printf  But please kids  DONT TRY THIS AT HOME    n

User · Answer

A violation like that means that there s something seriously wrong with the code  and it s unreliable   I can see that a program might want to try to save the user s data in a way that one hopes won t write over previous data  in the hope that the user s data isn t already corrupted  but there is by definition no standard method of dealing with undefined behavior

User · Answer

At least for me  the signal SIGSEGV      approach mentioned in another answer did not work on Win32 with Visual C   2015  What did work for me was to use  set se translator   found in eh h  It works like this   Step 1  Make sure you enable Yes with SEH Exceptions   EHa  in Project Properties   C     Code Generation   Enable C   Exceptions  as mentioned in the answer by Volodymyr Frytskyy   Step 2  Call  set se translator    passing in a function pointer  or lambda  for the new exception translator  It is called a translator because it basically just takes the low-level exception and re-throws it as something easier to catch  such as std  exception    include  lt string gt   include  lt eh h gt      Be sure to enable  Yes with SEH Exceptions   EHa   in C     Code Generation   set se translator    unsigned int u  EXCEPTION POINTERS  pExp        std  string error    SE Exception         switch  u        case 0xC0000005          error     Access Violation           break      default          char result 11           sprintf s result  11   0x 08X   u           error    result             throw std  exception error c str           Step 3  Catch the exception like you normally would   try      MakeAnException      catch std  exception ex       HandleIt

User · Answer

There is a very easy way to catch any kind of exception  division by zero  access violation  etc   in Visual Studio using try -  catch       block  A minor project settings tweaking is enough  Just enable  EHa option in the project settings  See Project Properties -  C C   -  Code Generation -  Modify the Enable C   Exceptions to  Yes With SEH Exceptions   That s it   See details here  http   msdn microsoft com en-us library 1deeycx5 v vs 80  aspx

User · Answer

A violation like that means that there s something seriously wrong with the code  and it s unreliable   I can see that a program might want to try to save the user s data in a way that one hopes won t write over previous data  in the hope that the user s data isn t already corrupted  but there is by definition no standard method of dealing with undefined behavior

User · Answer

Read it and weep   I figured it out  If you don t throw from the handler  the handler will just continue and so will the exception   The magic happens when you throw you own exception and handle that    include  stdafx h   include  lt stdio h gt   include  lt stdlib h gt   include  lt signal h gt   include  lt tchar h gt   void SignalHandler int signal        printf  Signal  d  signal       throw   Access Violation       int main         typedef void   SignalHandlerPointer  int        SignalHandlerPointer previousHandler      previousHandler   signal SIGSEGV   SignalHandler       try            int    0   0    Baaaaaaad thing that should never be caught  You should write good code in the first place            catch char  e                printf  Exception Caught   s n  e             printf  Now we continue  unhindered  like the abomination never happened   I am an EVIL genius  n        printf  But please kids  DONT TRY THIS AT HOME    n

User · Answer

Nope  C   does not throw an exception when you do something bad  that would incur a performance hit  Things like access violations or division by zero errors are more like  machine  exceptions  rather than language-level things that you can catch

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