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From:	"Elfyn McBratney" <elfyn-cygwin AT exposure DOT org DOT uk>
To:	"cygwin" <cygwin AT cygwin DOT com>,
	"Eric Mandel" <eric AT head-cfa DOT cfa DOT harvard DOT edu>
References:	<200302241923 DOT h1OJN2N19746 AT head-cfa DOT cfa DOT harvard DOT edu>
Subject:	Re: connect() not interrupted by sigalrm?
Date:	Mon, 24 Feb 2003 19:30:24 -0000
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> Thanks, Elfyn,
>
> > I believe I have found the problem. In order for your program to work as
> > expected you will need SA_INTERRUPT , which is not defined in
> > /usr/include/sys/signal.h . So it just laggs until it gets to the
"Network
> > unreachable" error. I'm not to sure the reason why it's not there (?).
>
> The SA_INTERRUPT flag was used by older systems such as Solaris 2.4,
> where, contrary to current expectations, all interrupted system calls
> were automatically restarted. On those systems, if you set the
> SA_INTERRUPT flag, the call would not be restarted, giving the
> behavior we now expect. (i.e. its behavior is the opposite of the
> SA_RESTART flag that we ordinarily use now to ensure restart of an
> interrupted system call. See Stevens Unix Network Programming, p. 121).
>
> So unless this is the official answer, I am doubtful that this is the
> actual problem, since by default, connect() should be interrupted by
> SIGALRM.


Ooops. I'm obviously showing my signal programming weakness' now. I'll shut
up ;-)


Regards,

Elfyn McBratney
elfyn AT exposure DOT org DOT uk
www.exposure.org.uk



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