add minimal poll(2) implementation for Windows

This provides sufficient functionality to run openssl(1) from a Windows
console. This is based on the original select-based version from from
songdongsheng@live.cn. Changes:

 * use nfds_t directly for iterating the fds.
 * add WSAGetLastError -> errno mappings
 * handle POLLHUP and the OOB data cases for revents
 * handle sparse arrays of fds correctly
 * KNF style updates
 * teach poll how to handle file handles as well as sockets

This handles the socket/non-socket issue  by alternating a loop between
WaitForMultipleObjects for non-sockets and and select for sockets. One
would think this would be terrible for performance, but as of this
writing, poll consumes about 6% of the time doing a bulk transfer
between a Linux box and 'openssl.exe s_server'.

I tried to implement this all in terms of WaitForMultipleObjects with a
select 'poll' at the end to get extra specific socket status. However,
the cost of setting up an event handle for each socket, setting the
WSAEventSelect attributes, and cleaning them up reliably was pretty
high. Since the event handle associated with a socket is also global,
creating a new one cancels the previous one or can be disabled
externally.

In addition, the 'FD_WRITE' status of a socket event handle does not
behave in an expected fashion, being triggered by an edge on a write
event rather than being level triggered.

Another fun horror story is how stdin in windows might be a console, it
might be a pipe, it might be something else. If these all worked in the
same way, it would be great. But, since a console-stdin can also signal
on a mouse or window event, it means we can easily get stuck in a
blocking read (you can't make stdin non-blocking) if the non-character
events are not filtered out. So, poll does that too.

See here for various additional horror stories:

http://www.postgresql.org/message-id/4351.1336927207@sss.pgh.pa.us

1 files changed, 1 insertions, 1 deletions

diff --git a/update.sh b/update.sh
index cda2766..1038bb3 100755
--- a/update.sh
+++ b/update.sh
@@ -283,7 +283,6 @@ copy_crypto x509v3 "v3_bcons.c v3_bitst.c v3_conf.c v3_extku.c v3_ia5.c v3_lib.c
         pcy_cache.c pcy_node.c pcy_data.c pcy_map.c pcy_tree.c pcy_lib.c
         pcy_int.h ext_dat.h"
 
-rm -f apps/*.c apps/*.h
 for i in $openssl_cmd_src/*; do
         cp $i apps
 done
@@ -444,6 +443,7 @@ crypto_win32_only=(
 # conditional compiles
 $CP $libc_src/stdlib/strtonum.c apps/
 apps_excludes=(
+        poll.c
         strtonum.c
         )
 apps_posix_only=(