isatty: Make it return true in Cygwin consoles on native Windows. * lib/isatty.c: Include <string.h>. (GetProcAddress): New macro. (GetNamedPipeClientProcessIdFuncType): New type. (GetNamedPipeClientProcessIdFunc): New variable. (QueryFullProcessImageNameFuncType): New type. (QueryFullProcessImageNameFunc): New variable. (initialized): New variable. (initialize): New function. (IsCygwinConsoleHandle): New function. (isatty): Invoke it. * doc/posix-functions/isatty.texi: Mention the issue.

Description:
accept4() function: accept a connection on a socket, with specific opening
flags.

Files:
lib/accept4.c
m4/accept4.m4

Depends-on:
sys_socket
accept
fcntl-h
binary-io
extensions
msvc-nothrow

configure.ac:
gl_FUNC_ACCEPT4
gl_SYS_SOCKET_MODULE_INDICATOR([accept4])

Makefile.am:
lib_SOURCES += accept4.c

Include:
<sys/socket.h>

Link:
$(LIBSOCKET)

License:
LGPL

Maintainer:
Simon Josefsson