Re: Signals

Richard B. Johnson (
Tue, 4 Feb 1997 20:26:48 -0500 (EST)

On 4 Feb 1997, H. Peter Anvin wrote:

> Hardly, since last I checked pending signals for a process was a
> bitmask...

As I mentioned in a follow up. The use of a bit-mask is an implementation
detail. Note that I concur that the "defined" signals have to be "masked".
I also note that there are "system dependent" macros to do this so there
is a consistant interface to user code. However, this does not preclude
designing other signals. In fact, AT&T Unix (1983) did this, called such
an arrangement ssignal() "Software signal".

Dick Johnson
Richard B. Johnson
Project Engineer
Analogic Corporation
Voice : (508) 977-3000 ext. 3754
Fax : (508) 532-6097
Modem : (508) 977-6870
Ftp :
Email :,
Penguin : Linux version 2.1.23 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.