Re: signal handling issue.

[Richard B. Johnson]

On Tue, 18 May 2004, Alex Davis wrote:

> There appears to be a change between linux 2.4 and 2.6
> in how signals are handled. As a test, I wrote the program
> below:
>
> #include <stdio.h>
> #include <signal.h>
> #include <setjmp.h>
>
> static jmp_buf env;
>
> static void handler(int s) {
>         printf("caught signal %d\n", s);
>         longjmp(env, 1);
> }

[SNIPPED...]

A a couple years ago they changed the rules. You can't longjmp
from a signal handler anymore. There's some other function
call with 'sig' in it, like siglongjmp or something like
that. Ahh... here it is:

/usr/include/setjmp.h:extern void siglongjmp __P ((sigjmp_buf __env, int __val))


Cheers,
Dick Johnson
Penguin : Linux version 2.4.26 on an i686 machine (5557.45 BogoMips).
            Note 96.31% of all statistics are fiction.


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