sockfilt.c: fixed and simplified Windows select function

Since the previous complex select function with initial support for
non-socket file descriptors, did not actually work correctly

sockfilt.c: fixed and simplified Windows select function

Since the previous complex select function with initial support for
non-socket file descriptors, did not actually work correctly for
Console handles, this change simplifies the whole procedure by using
an internal waiting thread for the stdin console handle.

The previous implementation made it continuously trigger for the stdin
handle if it was being redirected to a parent process instead of
an actual Console input window.

This approach supports actual Console input handles as well as
anonymous Pipe handles which are used during input redirection.

It depends on the fact that ReadFile supports trying to read zero bytes
which makes it wait for the handle to become ready for reading.

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sockfilt.c: Fixed detection of client-side connection close

WINSOCK only:
Since FD_CLOSE is only signaled once, it may trigger at the same
time as FD_READ. Data actually being availa

sockfilt.c: Fixed detection of client-side connection close

WINSOCK only:
Since FD_CLOSE is only signaled once, it may trigger at the same
time as FD_READ. Data actually being available makes it impossible
to detect that the connection was closed by checking that recv returns
zero. Another recv attempt could block the connection if it was
not closed. This workaround abuses exceptfds in conjunction with
readfds to signal that the connection has actually closed.

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sockfilt.c: Reduce CPU load while running under a Windows PIPE

sockfilt.c: Fixed handling of multiple fds being signaled

sockfilt.c: Added wrapper functions to fix Windows console issues

The new read and write wrapper functions support reading from stdin
and writing to stdout/stderr on Windows by using the

sockfilt.c: Added wrapper functions to fix Windows console issues

The new read and write wrapper functions support reading from stdin
and writing to stdout/stderr on Windows by using the appropriate
Windows API functions and data types.

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sockfilt.c: log file descriptor number on read/write error

test servers: handle W32/W64 SIGBREAK with exit_signal_handler

test servers: fix errno, ERRNO and SOCKERRNO usage for W32/W64

sockfilt.c: fix some W64 compiler warnings

sockfilt.c: fix some compiler warnings

tests/server/sockfilt.c: Fixed integer comparison warning

tests/server/sockfilt.c: Include required Win32 headers

tests/server/sockfilt.c: Fixed support for listening sockets

This commit fixes support for sockets that are ready to accept
a new connection and have previously been put into listening m

tests/server/sockfilt.c: Fixed support for listening sockets

This commit fixes support for sockets that are ready to accept
a new connection and have previously been put into listening mode.

It also includes changes which are the result of investigation
regarding Windows STDIN. These changes are the preparation for further
improvements regarding support for reading data from STDIN on Windows.

Open issue: WaitForMultipleObjectsEx does not support PIPE handles
which are returned by GetStdHandle while running without a GUI.

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tests/server/sockfilt.c: Set Windows Console to binary mode

tests/server/sockfilt.c: Improved log error messages

Include error code and parameters in error messages.

Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

f871de0... build: make use

Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

f871de0... build: make use of 76 lib/*.h renamed files
ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

13606bb... build: make use of 93 lib/*.c renamed files
5b6e792... build: rename 93 lib/*.c files
7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

lib/curl_imap.h
lib/curl_smtp.h

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build: make use of 76 lib/*.h renamed files

76 private header files renamed to use our standard naming scheme.

This change affects 322 files in libcurl's source tree.

sockfilt.c: commit b44da5a82a follow-up 2

sockfilt.c: commit b44da5a82a follow-up

sockfilt.c: fix some compiler warnings

socklift.c: Quick fix to re-add missing code

socklift.c: Added select_ws function to support Windows

WinSock select() does not support standard file descriptors,
it can only check SOCKETs. The following function is an attempt
t

socklift.c: Added select_ws function to support Windows

WinSock select() does not support standard file descriptors,
it can only check SOCKETs. The following function is an attempt
to create a select() function with support for other handles.

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setup_once.h: refactor inclusion of <unistd.h> and <sys/socket.h>

Inclusion of top two most included header files now done in setup_once.h

test servers: build adjustment

Undefine CURL_HIDDEN_SYMBOLS libcurl private preprocessor macro that might
leak from lib/setup.h into source files where this should not be defined.

FTP test server: NODATACONN commands commit c761fcb0 follow-up

Adjustments that make NODATACONN custom commands fully usable.