GNU ed maintainer, signal handling problem

[Claudio Fontana]

 --- Paul Eggert <address@hidden> writes: 
> Dan Jacobson <address@hidden> writes:
> > In ed(1),
> > pppppppppppp
> > and
> > p
> > do the same thing, print one line.
> 
> In traditional ed, "p" and "pp" both print one line,
> and "ppp", "pppp", etc. are errors.
> 
> POSIX requires support for both "p" and "pp", and
> deliberately doesn't specify whether "pp" writes
> the line once or twice.
> 
> So, the GNU behavior is a compatible extension to
> traditional
> behavior, and conforms to POSIX here.
> 
> I'm not sure whether all this mess is worth
> documenting.  ed hasn't
> changed for 10 years, and I'm not sure who's
> maintaining it now, if
> anybody.

It is Andrew L. Moore. I've also contacted him about
signal handling problems under GNU/Linux with ed 0.2,
but I have been ignored after explaining the problem
in detail.

I include the problem I described there (that I ONLY
experienced under GNU/Linux because of different
signal implementation):

The first time ed gets a SIGINT, the program seems to
correctly handle the signal, and aborts the executing
command (for example if command takes a long time, or
you are at [press return to continue]).

The problem is that the signal handler is exited via a
longjump, so sigreturn(2), which is inserted by the
kernel in the stack frame for the signal handler, is
never called, and the signal mask is not restored, and
so further SIGINTs do not trigger the handler.

I have to use ed on some systems and this problem is a
real pain.

Claudio


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