Use signal handler to return from a function

Question

Is it possible to write a signal handler that forces the program to return from a function?

For example, in the following code:

void myfun() { __asm__("repeat: jmp repeat"); }

myfun() has an indefinite loop. I would like to stop this indefinite loop and return to main function by raising some signal. Is this possible?

Thanks.

man setjmp

jxh
– jxh

2013-06-22 08:54:53 +00:00
Commented Jun 22, 2013 at 8:54 — jxh
– jxh, Commented Jun 22, 2013 at 8:54

Bryan Olivier · Accepted Answer · 2013-06-22 09:14:39Z

1

Inside the signal handler perform a longjmp to a setjmp prepared in main.

edited Jun 22, 2013 at 9:14

answered Jun 22, 2013 at 8:57

Bryan Olivier

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2 Comments

Arani Over a year ago

In the given assembly code, no volatile variable is being checked. I am using it to profile processor performance for branch instructions, and so interference from other variables should be minimal. Ideally, I would like to raise an exception that allows the function to return.

Bryan Olivier Over a year ago

@Arani I checked the standard and I don't see any provision that forbids you to call the longjmp directly from the handler and then the loop doesn't have to be changed. I'll change my answer accordingly.

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