In case a process encounters high-numbered FDs, this allows
consistent performance on systems with ppoll support.
[ruby-core:35572]
* ext/socket/lib/socket.rb (connect_nonblock): use IO#wait_writable
* lib/drb/drb.rb (DRB::DRbTCPSocket#alive?): use IO#wait_readable
* lib/webrick/httpserver.rb (run): ditto
* lib/resolv.rb (request): ditto for single socket case
[ruby-core:68943] [Feature #11081]
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Errno::EISCONN and IO::WaitReadable exceptions are common,
expensive, and noisy under normal use. Avoid raising on them
since they are not exceptional.
* ext/socket/lib/socket.rb (connect_internal): avoid common exceptions
from connect_nonblock. [ruby-core:68909]
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it may be set before the body.
Reported by ko1 and mrkn. [ruby-core:59088] [Bug #9247]
* lib/cgi/core.rb: Ditto.
* lib/drb/ssl.rb: Ditto.
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sizeof(sa_familiy_t) if path is empty. see "Autobind Feature" in
unix(7) for details.
* ext/socket/lib/socket.rb (unix_socket_abstract_name?): treat an
empty path as an abstract name.
* test/socket/test_unix.rb: related test.
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ext/socket/unixsocket.c (unixsock_connect_internal,
rsock_init_unixsock): calculate the correct address length of
an abstract socket. Without this fix, sizeof(struct sockaddr_un)
is specified as the length of an abstract socket for bind(2) or
connect(2), so the address of the socket is filled with extra NUL
characters. See unix(7) for details.
* ext/socket/lib/socket.rb (unix_server_socket): don't access the
file system if the platform is Linux and path starts with NUL,
which means that the socket is an abstract socket.
* test/socket/test_unix.rb: related test.
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equality. For example, protocol 0 and IPPROTO_TCP is not problem
for TCP.
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if the address is IPv4-mapped IPv6 address for 0.0.0.0 for MacOS X.
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if given. close the sockets when the block exits.
(Socket.udp_server_loop): use udp_server_sockets in block form.
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if given. close the sockets when the block exits.
(Socket.tcp_server_loop): use tcp_server_sockets in block form.
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(Socket.udp_server_loop_on): new method.
(Socket.udp_server_loop): new method
(Socket.ip_sockets_port0): extracted from tcp_server_sockets_port0.
(Socket::UDPSource): new class.
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private function for allocating same port both IPv4 and IPv6.
(Socket.tcp_server_sockets): use tcp_server_sockets_port0 for port 0.
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