Addrinfo.getaddrinfo and .foreach now accepts :timeout in seconds as
a keyword argument. If getaddrinfo_a(3) is available, the timeout will be
applied for name resolution. Otherwise, it will be ignored.

Socket.tcp accepts :resolv_timeout to use this feature.

This commit is retry of 6382f5cc91ac9e36776bc854632d9a1237250da7.
Test was failed on Solaris machines which don't have "http" in
/etc/services. In this commit, use "ssh" instead.

This reverts commit 6382f5cc91ac9e36776bc854632d9a1237250da7.
test failed on Solaris.

Addrinfo.getaddrinfo and .foreach now accepts :timeout in seconds as
a keyword argument. If getaddrinfo_a(3) is available, the timeout will be
applied for name resolution. Otherwise, it will be ignored.

Socket.tcp accepts :resolv_timeout to use this feature.

* ext/socket/lib/socket.rb (Addrinfo#connect_internal): make
  protected for Addrinfo#connect_to, instead of private and send.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62449 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

IO#read_nonblock and IO#write_nonblock take into account
buffered data, so the Linux-only BasicSocket#read_nonblock
and BasicSocket#write_nonblock methods must, too.

This bug was only introduced in r58400
("socket: avoid fcntl for read/write_nonblock on Linux")
and does not affect any stable release.

* ext/socket/basicsocket.c (rsock_init_basicsocket):
* ext/socket/init.c (rsock_s_recvfrom_nonblock):
* ext/socket/init.c (rsock_init_socket_init):
* ext/socket/lib/socket.rb (def read_nonblock):
* ext/socket/lib/socket.rb (def write_nonblock):
* ext/socket/rubysocket.h (static inline void rsock_maybe_wait_fd):
* test/socket/test_basicsocket.rb (def test_read_write_nonblock):
  [Feature #13362]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60496 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  These are detected by https://github.com/client9/misspell

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60359 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

[Fix GH-1725]
From: yuuji.yaginuma <yuuji.yaginuma@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

On platforms where MSG_DONTWAIT works reliably on all sockets
(so far, I know of Linux), we can avoid fcntl syscalls and
implement IO#write_nonblock and IO#read_nonblock in terms of the
socket-specific send and recv family of syscalls.

This avoids side effects on the socket, and also encourages
generic code to be written in cases where IO wrappers like
OpenSSL::SSL::SSLSocket are used.

Perhaps in the future, side-effect-free non-blocking I/O can
be standard on all files and OSes: https://cr.yp.to/unix/nonblock.html

* ext/socket/lib/socket.rb (read_nonblock, write_nonblock):
  Linux-specific wrapper without side effects
  [ruby-core:80780] [Feature #13362]
* test/socket/test_basicsocket.rb (test_read_write_nonblock):
  new test

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58400 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Symbol proc is shorter human and machine code;
and also avoids needing to name variables.

* ext/socket/lib/socket.rb (Socket.udp_server_sockets): use symbol proc

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58320 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* ext/socket/lib/socket.rb (Socket.udp_server_sockets): remove duplicated
  addresses before passing it to ip_sockets_port0 because it causes
  Errno::EADDRINUSE and retry forever.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58293 b2dd03c8-39d4-4d8f-98ff-823fe69b080e