Re: [Iaxclient-devel] SIGSEGV in libiax2 on FreeBSD

[Scott L. <la...@la...>]

On Mon, Jul 28, 2003 at 09:32:14AM -0400, Steve Kann wrote:
> On Sun, 2003-07-27 at 22:17, Scott Lambert wrote:
> 
> > I finally got some time to play with this some more.  I think I'm
> > running into a problem that only shows up in GCC 3.x.  I think
> > I remember seeing something about this type of problem on the
> > FreeBSD-current list lately.  Unfortunately, I wasn't paying close
> > enough attention.  I've been trawling the archives for a while now
> > but still haven't found the answer.
>
>
> Well, that's a pretty strange one.  I don't know how that line could
> possibly cause a segfault!  That should probably just be a constant
> assignment!
>
> However, that line doesn't show up the same for me in my sources;

Don't expect your source line numbers to match mine, I've been making
changes to get it to build under FreeBSD, (added 8 lines).  The changes
aren't functionally any different from what I had to do to iax1 to make
it work.  I'll attach my changes to lib/libiax2/src and the Makefiles
for iaxclient/simpleclient/[iaxphone|wx] since they haven't been
committed yet.

Which GCC version are you using?

>    2255 static struct iax_event *iax_net_read(void)
>    2256 {
>    2257         char buf[65536];
>    2258         int res;
>    2259         struct sockaddr_in sin;
>    2260         int sinlen;
>    2261         sinlen = sizeof(sin);
>    2262         res = recvfrom(netfd, buf, sizeof(buf), 0, (struct
> sockaddr *) &sin, &sinlen);
>    2263         if (res < 0) {
>    2264 #ifdef  WIN32
>    2265                 if (WSAGetLastError() != WSAEWOULDBLOCK) {
>    2266                         DEBU(G "Error on read: %d\n",
> WSAGetLastError());
>    2267                         IAXERROR "Read error on network socket:
> %s", strerror(errno));
>    2268                 }
>    2269 #else
>    2270                 if (errno != EAGAIN) {
>    2271                         DEBU(G "Error on read: %s\n",
> strerror(errno));
>    2272                         IAXERROR "Read error on network socket:
> %s", strerror(errno));
>    2273                 }
>    2274 #endif
>    2275                 return NULL;
>    2276         }
>    2277         return iax_net_process(buf, res, &sin);
>    2278 }
> 
> And the next line, calling recvfrom, probably shouldn't cause a segfault
> either, because buf is on the stack, and we seem to be calling it
> correctly.
> 
> 
> 
> -SteveK
> 
> 
> > 
> > Starting program: /home/lambert/src/vendor/iaxclient/simpleclient/wx/wx 
> > libiax2/src/iax.c line 584 in iax_init: Started on port 4569
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > iax_net_read () at libiax2/src/iax.c:2269
> > 2269            sinlen = sizeof(sin);
> > Current language:  auto; currently c
> > (gdb) bt
> > #0  iax_net_read () at libiax2/src/iax.c:2269
> > #1  0x0805f6e0 in iax_get_event (blocking=0) at libiax2/src/iax.c:2418
> > #2  0x0805b6ff in do_iax_event () at iaxclient_lib.c:682
> > #3  0x0805b63f in iaxc_service_network (netfd=8) at iaxclient_lib.c:632
> > #4  0x0805ab7c in iaxc_process_calls () at iaxclient_lib.c:297
> > #5  0x0805abae in iaxc_processor (args=0x0) at iaxclient_lib.c:308
> > #6  0x280a351e in _thread_start () from /usr/lib/libc_r.so.5
> 
> -- 
>   Steve Kann - Chief Engineer - 520 8th Ave #2300 NY 10018 -  (212) 533-1775
>                 HorizonLive.com - collaborate . interact . learn
>    "The box said 'Requires Windows 95, NT, or better,' so I installed Linux."

-- 
Scott Lambert                    KC5MLE                       Unix SysAdmin
la...@la...