Exception Handling

[Manish Kumar (WT01 - Software Products & OSS)]

Hi,

We have some modules of our project implemented in python and some in C.
We use shared library objects to access C functions from python.

We need to catch the exceptions like segmentation fault occurring in the
C module in python and print the complete stack.

We tried 1) signal.signal(SIGSEGV, handler_function)
2) try:
call to C functions through shared object
except:
traceback.print_exc(file=sys.stdout)
We got this.
1) But it hangs the process.

2) It does not print the stack.

Can you please suggest some solutions ?

Thanks and Regards
Manish Kumar



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[Sheldon]

Hi,
This is a non-trivial thing that you are trying to do. You can use some
of python's built-in exceptions, like RuntimeError or IOError and if so
then:
try:
call C
except IOError, e:
print e

But this will return and print only IOErrors if they occur.

You can define your own error handling using the function RAISE:
try:
Call C
except:
raise my_error.

A catch-all error is RuntimeError; try this first.
try:
call C
except RuntimeError, r:
print r

You can read up on it here:
http://docs.python.org/api/standardExceptions.html


Cheers,
Sheldon