Re: Incorect signal handling ?

[Doug McNaught]

Daniel Podlejski <[e-mail]> writes:

> Hi,
> 
> there is litlle programm:
> 
> 	signal (SIGALRM, empty);
> 	alarm (1);
> 
>         a = read(fd, buf, 511);
> 
>         while (a && a != -1) a = read(fd, buf, 511);

> I open /tmp/nic and run compiled program.
> There should be error EINTR in read, but isn't.

"Fast" system calls (eg reads from disk) are generally
uninterruptible; thus the signal will be deferred until the read()
returns.

-Doug