TCPProblem -- more info -- short program that hangs included

[Alex Pavloff]

Here is a sample program that duplicates the problems I described yesterday.
What's going on here?  Is it CC++ that's broken or gcc?  Would other people
try this and see what the result is?  It appears that after 32 or 33 quickly
repeated call to isPending(), something breaks horribly.


#include <cc++/socket.h>

int main()
{
        try
        {
                // Just connect to a port that won't send data -- doesn't
matter what
                ost::TCPStream foo("10.0.0.5",5800,512,true,100);
                for( ; ; )
                {
                        while( foo.isPending(ost::Socket::pendingInput,100)
);
                }
        }
        catch( ost::Socket* s )
        {
                std::cout << "Socket error" << std::endl;
        }
        return 0;
}

   Here is the GDB backtrace.  Notice how the this pointer got completely
clobbered
   resulting in a massively large value being passed to poll(), which causes
the hang
   but what causes the clobbering in the first place?

(gdb) bt
#0  0x420d224b in poll () from /lib/i686/libc.so.6
#1  0x4004436f in ost::Socket::isPending(ost::Socket::Pending, unsigned
long) (
    this=0xfffffffc, pending=53, timeout=3221222896) at socket.cpp:502
#2  0x400466bc in ost::TCPStream::isPending(ost::Socket::Pending, unsigned
long) (this=0xbffff670, pending=pendingInput, timeout=100) at
socket.cpp:1158
#3  0x0804903e in main () at cute.cpp:12
#4  0x420158d4 in __libc_start_main () from /lib/i686/libc.so.6