On Mon, Jan 11, 2010 at 05:22:56PM +0100, Cyril Hrubis wrote:
> Hi!
>
> > /*
> > sigusr1: allocate/free memory on receving SIGUSR1
> > */
> > void sigusr1(int num) {
> > mem_map();
> > flag_allocated = !flag_allocated;
> > }
> >
> > int main(int argc, char **argv) {
> > signal(SIGINT, sigint);
> > signal(SIGUSR1, sigusr1);
> >
> > process_options(argc, argv);
> >
> > while(!flag_exit)
> > sleep(1);
> >
> > return 0;
> > }
>
>
> You can't allocate memory from signal handler. There is a list of signal safe
> functions in 'man 7 signal'. The correct solution for this is to create
> something like named pipe and sleep in read() on it (instead of
> 'while(!flag_exit) sleep(1)').
Naufel,
You might like to address the comments by Cyril. For named pipes you can
see man mkfifo in bash or open in c where you can specify the file as a
pipe or FIFO. A busy wait like you implemented is not a good practice.
Repost your patches with the comments addressed.
>
> --
> Cyril Hrubis
> [email protected]
>
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--
Regards
Sudhir Kumar
Linux Technology Center
IBM, India.
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