From: sos AT prospect DOT com DOT ru (Sergey Okhapkin)
Subject: Problem with select()
19 Sep 1998 03:47:35 -0700
Message-ID: <01BDE3DC.595A43C0.cygnus.cygwin32.developers@sos>
To: "'cygwin32-developers AT cygnus DOT com'" <cygwin32-developers AT cygnus DOT com>

Hi!

I have a strange problem with wget-1.5.2 running a new dll. Select call (to 
check for write and except on socket) succeeded in select thread, but fails 
in poll later with WSAENOTSOCK error (one more NT bug?-). Here is an 
extract from tracefile, note marked lines:

[main] wget 1000 (0) cygwin32_select: 4, 0x0, 0x242EC20, 0x242EC18, 
0x242EC10
[main] wget 1000 (0) hinfo::select_write: /dev/tcp fd 3
[main] wget 1000 (0) hinfo::select_except: /dev/tcp fd 3
>[main] wget 1000 (0) start_thread_socket: adding socket 0x100
[main] wget 1000 (0) start_thread_socket: stuff_start 0x242EB2C, exitsock 
148
[main] wget 1000 (0) select_stuff::wait: n 2, ms 900000
[select_socket] wget 1000 (0) thread_socket: stuff_start 0xA044E04
>[select_socket] wget 1000 (0) thread_socket: Win32 select returned 1
[select_socket] wget 1000 (0) thread_socket: s 0xA031880, testing fd 3 
(/dev/tcp)
[select_socket] wget 1000 (0) thread_socket: write_ready
[main] wget 1000 (0) select_stuff::wait: woke up.  wait_ret 1.  verifying
[main] wget 1000 (0) select_stuff::wait: gotone 1
>[main] wget 1000 (0) poll_socket: polling socket 0x100
[main] wget 1000 (0) poll_socket: adding write fd_set /dev/tcp, fd 3
[main] wget 1000 (0) poll_socket: adding except fd_set /dev/tcp, fd 3
>[main] wget 1000 (0) poll_socket: WINSOCK_SELECT returned -1
[main] wget 1000 (0) poll_socket: error 10038
[main] wget 1000 (0) select_stuff::poll: returning 0
[main] wget 1000 (0) select_stuff::~select_stuff: calling cleanup routines
[main] wget 1000 (0) socket_cleanup: si 0xA041DF0 si->thread 0x158
[main] wget 1000 (0) select_stuff::~select_stuff: deleting select records

I run NTS4.0 SP3 with MS winsock proxy client installed. To fix a problem I 
made the following changes in select() code:

select.cc	(poll_socket): do not call win32 select if the socked is checked
		already in select thread, debug printf added.
		(start_thread_socket): debug printfs added.
		(socket_cleanup): delete si when it no longer needed.

 

--
Sergey Okhapkin, http://www.lexa.ru/sos
Moscow, Russia


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end