Re: permissions (and other) problems

On Tuesday, September 17, 2002, at 06:23 PM, Barry Scott wrote:

> Posix standardised signals not ANSI C. Posix uses
> sigaction() and friends.
>
> There is also the pre-posix signals on old Unix API,
> signal() etc.
>
> Atleast on HP-UX there are both pre-posix and posix signals.
> If you mix them your code breaks is subtle ways.
>
> APR is essential to hide this mess and allow portability
> across Unix let along the none Unix OS.

ok, after looking at the code for apr_signal, i can see why we need
something to mediate all the random weird-ass implementations out
there, but from what i've been able to find (on the net and in K&R and
harbison and steele's 'C, a reference manual'), it seems that
rudimentary signals are part of ANSI C. that said, i am using
apr_signal, because there is still a significant portability problem.

the last remaining question is "if signal itself isn't portable, is
sig_atomic_t?" according to all i've read, and what philip has said,
about the only thing that's safe to do in a signal handler is to set a
sig_atomic_t variable... if that typedef isn't considered portable, it
complicates life considerably...

-garrett

-- 
garrett rooney                    Remember, any design flaw you're
rooneg@electricjellyfish.net      sufficiently snide about becomes
http://electricjellyfish.net/     a feature.       -- Dan Sugalski
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