poll crashes with > 1200 fds

[Dan Kegel]

It looks like poll() is implemented on top of select() in cygwin.
This is fine unless you try to use it in a program with
more than 1024 fd's or so.  Here's the result of running a test app
that goes beyond that limit:

Program received signal SIGSEGV, Segmentation fault.
0x6106fe3a in select () from /usr/bin/cygwin1.dll
(gdb) bt
#0  0x6106fe3a in select () from /usr/bin/cygwin1.dll
#1  0x61610790 in ?? ()
#2  0x6106ca1d in select () from /usr/bin/cygwin1.dll
#3  0x6106c223 in select () from /usr/bin/cygwin1.dll
#4  0x61059e7d in poll () from /usr/bin/cygwin1.dll
#5  0x004012d3 in count_connects (ipadr=16777343, portnum=80, want=1200) at pollbug.c:120
#6  0x0040175d in main (argc=2, argv=0xa0418c8) at pollbug.c:211

And here's the test code.  To reproduce the bug, just run with argument 1500 or so.
- Dan

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