Date: Fri, 11 Dec 1998 01:55:14 -0800 From: Peter Edwards <peter.edwards@isocor.ie> To: Archie Cobbs <archie@whistle.com> Cc: Matthew Dillon <dillon@apollo.backplane.com>, jwd@unx.sas.com, freebsd-current@FreeBSD.ORG Subject: Re: inetd: realloc/free bug Message-ID: <3670EC02.D35D99CC@isocor.ie> References: <199812110628.WAA23665@bubba.whistle.com>
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Hi,
>
> It's not trivial if you want to guarantee that no signals are missed.
> There's no way atomically to: unblock signals and call select().
Hmm. I must be twisted.
What horror results from doing this in a signal handler? On e-paper, it
seems to give the desired effect, but does a return from a signal
handler implicitly call sigreturn(2) when it returns? And if so, is
there anything that requires this to happen?
...
sigusr1handler()
{
longjmp(jump_buf,1);
}
selecting_func()
{
if (setjmp(jump_buf) == 0) {
sigprocmask(SIG_UNBLOCK, {...SIGUSR1...}, 0)
/* Signal arriving now returns after the select call. */
select(...);
sigprocmask(SIG_BLOCK, {...SIGUSR1...}, 0);
}
/* select finished, or signal arrived after the
sigprocmask(SIG_UNBLOCK). */
}
--
Peter.
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