How to handle C exceptions in Objective-C

Question

I have a bunch of C functions in my Objective-C project iOS app, that can potentially crash. I want to be able to handle those crashed. At first, I thought to use @try-catch mechanism, but as far as I understand, all exceptions inside this block must be thrown to be handled. Is it true? How can I solve my problem?

For example, this is a call of a C function in Objective-C code. Potentially this function can crush.

err = mailimap_list(session, "", "*", &allList);

"How can I solve my problem?" Make sure your C code does not crash. — Sergey Kalinichenko
– Sergey Kalinichenko, Commented Feb 6, 2013 at 13:58
The documentation suggests that you need to check the returned error code--in your code, err--namely, check that it is not MAILIMAP_NO_ERROR. Is this what you're referring to? — Nate Chandler
– Nate Chandler, Commented Feb 6, 2013 at 13:59
No, this function sometimes doesn't even return err. It just crashes inside. — Denis Kutlubaev
– Denis Kutlubaev, Commented Feb 6, 2013 at 14:10

user529758 · Accepted Answer · 2013-02-06 13:57:40Z

2

Long story short: you can't.

Long explanation: C doesn't have "exceptions". If C code crashes, that's something fatal concerning the life of the process. For example, a detected segmentation fault will make the OS terminate your process. These are not nice Obejctive-C-style exceptions which can be handled.

answered Feb 6, 2013 at 13:57

user529758

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Vinzzz · Accepted Answer · 2013-02-06 13:58:57Z

1

Is there such thing as 'C exceptions' ? If they don't exist, you don't have to handle them : problem solved !

answered Feb 6, 2013 at 13:58

Vinzzz

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