Date: Mon, 29 Oct 2001 15:22:45 -0800 (PST) From: k Macy <kip_macy@yahoo.com> To: Ian Dowse <iedowse@maths.tcd.ie> Cc: freebsd-hackers@freebsd.org Subject: Re: problems with recurring SIGTRAP under gdb Message-ID: <20011029232245.12082.qmail@web14005.mail.yahoo.com> In-Reply-To: <200110291230.aa64062@salmon.maths.tcd.ie>
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SIGIO is used, but only for AIO and at this point no
aio_* calls have been made.
The loop for reading from STDIN may be a problem but I
don't see how - this same loop is used without
problems
on Linux, OSF, and Solaris (although on Linux if you
press Ctrl-C in gdb it often won't let you continue):
int
sim_getc(char *cp)
{
int r;
sk_wait_for_fd(0);
r = read(0, cp, 1);
if (r <= 0) {
dbg_printf("pccons_getchar: read
failed: %s\n", error_msg());
sk_panic("pccons_getchar: failed read
on stdin");
}
return r;
}
sk_wait_for_fd is just:
void sk_wait_for_fd(int fd)
{
int slot;
sk_Msg *msg;
if (sk_poll_one_fd(fd)>0) {
/* fd is already ready */
return;
}
slot = sk_add_poll_fd(fd);
if(slot < 0)
return;
do {
msg = sk_receive();
if((msg->type == SK_SIGNAL_MSG) &&
(msg->data.l == HARD_SIG_00010))
break;
} while (1);
sk_remove_poll_fd(slot);
}
beneath this it just uses poll
--- Ian Dowse <iedowse@maths.tcd.ie> wrote:
> In message
>
<20011029023746.94559.qmail@web14001.mail.yahoo.com>,
> k Macy writes:
> >Any idea why when I insert a breakpoint I get a
> >SIGTRAP
> >and can't continue any further? Is this a bug in
> the
>
> I've seen this on applications that use SIGIO on
> stdin. If this is the
> case, a workaround is to disable the SIGIO signal
> while using the
> debugger, e.g:
>
> (gdb) set $oldsigio = signal(23, (void *)1)
>
> The signal handler can be put back later with:
>
> call signal(23, (void *)$oldsigio)
>
> Ian
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