sigaddset() should return 0 or -1

[rbh00 at netcom dot com (Richard Hitt)]

Hi.

I'm porting an application that expects sigaddset() to return 0 if it
worked.  But in the CDK, sigaddset is implemented by a macro that
doesn't care what it returns.  The file is
/cygnus/b19/H-i386-cygwin32/i386-cygwin32/include/sys/signal.h.
The macro is
#define sigaddset(what,sig) (*(what) |= (1<<(sig)))

So I changed it to always return 0:
#define sigaddset(what,sig) ((*(what) |= (1<<(sig))),0)

and avoided an unpleasant hack in my application.  May I suggest that
you consider incorporating this change in your signal.h?  Or, for all
I know, there may be other considerations why the macro must be as it
is.

Thanks for a fine environment.

Richard Hitt
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