Re: [Valgrind-users] valgrind and poll()

[David E. <da...@2g...>]

On Wed, 2003-04-02 at 19:53, Jeremy Fitzhardinge wrote:
> On Wed, 2003-04-02 at 09:02, David Eriksson wrote: 
> > For the fun of it, I tried to send a SIGHUP to my process. There is
> > singal handler installed with signal() for SIGHUP, which gets executed
> > properly. What also happens is that all threads (one for each connection
> > that have been made to the server) get to run!
> > 
> > Do you have any ideas?
> > 
> > I will happily provide any more information that may be of interest.
> What does strace have to say about your running process?  Is it
> blocked in a a system call, or does it seem to be spinning away
> happily?
> 
> It's possible that the libc poll (or some other blocking system call)
> is somehow getting called without being intercepted by Valgrind. 

Strace stops in poll, and if I attach to the server process with gdb I
get this stacktrace:

(gdb) bt
#0  0x40183272 in vgPlain_do_syscall () from
/usr/local/lib/valgrind/valgrind.so
#1  0x4023c4d0 in __JCR_LIST__ () from /usr/lib/libglib-1.2.so.0
#2  0x40170c97 in poll (__fds=0x4223bf3c, __nfds=0x2, __timeout=0xea60)
at vg_intercept.c:194
#3  0x4022a3cb in g_main_poll () from /usr/lib/libglib-1.2.so.0
#4  0x40229c95 in g_main_iterate () from /usr/lib/libglib-1.2.so.0
#5  0x4022a0f4 in g_main_run () from /usr/lib/libglib-1.2.so.0
#6  0x0804c671 in main (argc=0x0, argv=0xbfffe8e4) at smaccd.c:616
#7  0x403d3907 in __libc_start_main () from /lib/libc.so.6

-- 
-\- David Eriksson -/-                              www.2GooD.nu
 
"I personally refuse to use inferior tools because of ideology."
                                                - Linus Torvalds