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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2015-03-12 03:03:04 +0000
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2015-03-12 03:03:04 +0000
commitaaf2d070a8351dc3118422bae478978f3d3e3966 (patch)
treeeb6a9e96b9cf8dde77875a2cd828333d1b9a743a
parent724012a23d8274543002eb42ef71d87308481d40 (diff)
accept_nonblock supports "exception: false"
This is analogous to functionality found in IO#read_nonblock and IO#wait_nonblock. Raising exceptions for common failures on non-blocking servers is expensive and makes $DEBUG too noisy. Benchmark results: user system total real default 2.790000 0.870000 3.660000 ( 3.671597) exception: false 1.120000 0.800000 1.920000 ( 1.922032) exception: false (cached arg) 0.820000 0.770000 1.590000 ( 1.589267) --------------------- benchmark script ------------------------ require 'socket' require 'benchmark' require 'tmpdir' nr = 1000000 Dir.mktmpdir('nb_bench') do |path| sock_path = "#{path}/test.sock" s = UNIXServer.new(sock_path) Benchmark.bmbm do |x| x.report("default") do nr.times do begin s.accept_nonblock rescue IO::WaitReadable end end end x.report("exception: false") do nr.times do begin s.accept_nonblock(exception: false) rescue IO::WaitReadable abort "should not raise" end end end x.report("exception: false (cached arg)") do arg = { exception: false } nr.times do begin s.accept_nonblock(arg) rescue IO::WaitReadable abort "should not raise" end end end end end * ext/socket/init.c (rsock_s_accept_nonblock): support exception: false [ruby-core:66385] [Feature #10532] * ext/socket/init.c (rsock_init_socket_init): define new symbols * ext/socket/rubysocket.h: adjust prototype * ext/socket/socket.c (sock_accept_nonblock): support exception: false * ext/openssl/ossl_ssl.c (ossl_ssl_accept_nonblock): ditto * ext/socket/socket.c (Init_socket): adjust accept_nonblock definition * ext/openssl/ossl_ssl.c (Init_ossl_ssl): ditto * ext/socket/tcpserver.c (rsock_init_tcpserver): ditto * ext/socket/unixserver.c (rsock_init_unixserver): ditto * ext/socket/tcpserver.c (tcp_accept_nonblock): adjust rsock_s_accept_nonblock call * ext/socket/unixserver.c (unix_accept_nonblock): ditto * ext/openssl/ossl_ssl.c (ossl_start_ssl): support no_exception * ext/openssl/ossl_ssl.c (ossl_ssl_connect): adjust ossl_start_ssl call * ext/openssl/ossl_ssl.c (ossl_ssl_connect_nonblock): ditto * ext/openssl/ossl_ssl.c (ossl_ssl_accept): ditto * test/socket/test_nonblock.rb (test_accept_nonblock): test for "exception :false" * test/socket/test_tcp.rb (test_accept_nonblock): new test * test/socket/test_unix.rb (test_accept_nonblock): ditto * test/openssl/test_pair.rb (test_accept_nonblock_no_exception): ditto git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49948 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
-rw-r--r--ChangeLog26
-rw-r--r--NEWS8
-rw-r--r--ext/openssl/ossl_ssl.c31
-rw-r--r--ext/socket/init.c18
-rw-r--r--ext/socket/rubysocket.h2
-rw-r--r--ext/socket/socket.c16
-rw-r--r--ext/socket/tcpserver.c12
-rw-r--r--ext/socket/unixserver.c12
-rw-r--r--test/openssl/test_pair.rb27
-rw-r--r--test/socket/test_nonblock.rb2
-rw-r--r--test/socket/test_tcp.rb8
-rw-r--r--test/socket/test_unix.rb7
12 files changed, 146 insertions, 23 deletions
diff --git a/ChangeLog b/ChangeLog
index ad84bf9..4dc5744 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,29 @@
+Thu Mar 12 05:54:27 2015 Eric Wong <e@80x24.org>
+
+ * ext/socket/init.c (rsock_s_accept_nonblock):
+ support exception: false
+ [ruby-core:66385] [Feature #10532]
+ * ext/socket/init.c (rsock_init_socket_init): define new symbols
+ * ext/socket/rubysocket.h: adjust prototype
+ * ext/socket/socket.c (sock_accept_nonblock): support exception: false
+ * ext/openssl/ossl_ssl.c (ossl_ssl_accept_nonblock): ditto
+ * ext/socket/socket.c (Init_socket): adjust accept_nonblock definition
+ * ext/openssl/ossl_ssl.c (Init_ossl_ssl): ditto
+ * ext/socket/tcpserver.c (rsock_init_tcpserver): ditto
+ * ext/socket/unixserver.c (rsock_init_unixserver): ditto
+ * ext/socket/tcpserver.c (tcp_accept_nonblock): adjust
+ rsock_s_accept_nonblock call
+ * ext/socket/unixserver.c (unix_accept_nonblock): ditto
+ * ext/openssl/ossl_ssl.c (ossl_start_ssl): support no_exception
+ * ext/openssl/ossl_ssl.c (ossl_ssl_connect): adjust ossl_start_ssl call
+ * ext/openssl/ossl_ssl.c (ossl_ssl_connect_nonblock): ditto
+ * ext/openssl/ossl_ssl.c (ossl_ssl_accept): ditto
+ * test/socket/test_nonblock.rb (test_accept_nonblock): test for
+ "exception :false"
+ * test/socket/test_tcp.rb (test_accept_nonblock): new test
+ * test/socket/test_unix.rb (test_accept_nonblock): ditto
+ * test/openssl/test_pair.rb (test_accept_nonblock_no_exception): ditto
+
Thu Mar 12 10:53:06 2015 Koichi Sasada <ko1@atdot.net>
* internal.h, node.h: move a definition of `struct rb_global_entry'
diff --git a/NEWS b/NEWS
index 114b9d2..d686e72 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,14 @@ with all sufficient information, see the ChangeLog file.
=== Stdlib updates (outstanding ones only)
+* Socket
+ * Socket#accept_nonblock supports `exception :false` to return symbols
+ Ditto for TCPServer#accept_nonblock, UNIXServer#accept_nonblock
+
+* OpenSSL
+ * OpenSSL::SSL::SSLSocket#accept_nonblock supports `exception: false`
+ to return symbols
+
=== Stdlib compatibility issues (excluding feature bug fixes)
* lib/webrick/utils.rb
diff --git a/ext/openssl/ossl_ssl.c b/ext/openssl/ossl_ssl.c
index af93252..48e9730 100644
--- a/ext/openssl/ossl_ssl.c
+++ b/ext/openssl/ossl_ssl.c
@@ -1271,7 +1271,8 @@ read_would_block(int nonblock)
}
static VALUE
-ossl_start_ssl(VALUE self, int (*func)(), const char *funcname, int nonblock)
+ossl_start_ssl(VALUE self, int (*func)(), const char *funcname,
+ int nonblock, int no_exception)
{
SSL *ssl;
rb_io_t *fptr;
@@ -1295,10 +1296,12 @@ ossl_start_ssl(VALUE self, int (*func)(), const char *funcname, int nonblock)
switch((ret2 = ssl_get_error(ssl, ret))){
case SSL_ERROR_WANT_WRITE:
+ if (no_exception) { return ID2SYM(rb_intern("wait_writable")); }
write_would_block(nonblock);
rb_io_wait_writable(FPTR_TO_FD(fptr));
continue;
case SSL_ERROR_WANT_READ:
+ if (no_exception) { return ID2SYM(rb_intern("wait_readable")); }
read_would_block(nonblock);
rb_io_wait_readable(FPTR_TO_FD(fptr));
continue;
@@ -1324,7 +1327,7 @@ static VALUE
ossl_ssl_connect(VALUE self)
{
ossl_ssl_setup(self);
- return ossl_start_ssl(self, SSL_connect, "SSL_connect", 0);
+ return ossl_start_ssl(self, SSL_connect, "SSL_connect", 0, 0);
}
/*
@@ -1349,7 +1352,7 @@ static VALUE
ossl_ssl_connect_nonblock(VALUE self)
{
ossl_ssl_setup(self);
- return ossl_start_ssl(self, SSL_connect, "SSL_connect", 1);
+ return ossl_start_ssl(self, SSL_connect, "SSL_connect", 1, 0);
}
/*
@@ -1363,12 +1366,12 @@ static VALUE
ossl_ssl_accept(VALUE self)
{
ossl_ssl_setup(self);
- return ossl_start_ssl(self, SSL_accept, "SSL_accept", 0);
+ return ossl_start_ssl(self, SSL_accept, "SSL_accept", 0, 0);
}
/*
* call-seq:
- * ssl.accept_nonblock => self
+ * ssl.accept_nonblock([options]) => self
*
* Initiates the SSL/TLS handshake as a server in non-blocking manner.
*
@@ -1383,12 +1386,24 @@ ossl_ssl_accept(VALUE self)
* retry
* end
*
+ * By specifying `exception: false`, the options hash allows you to indicate
+ * that accept_nonblock should not raise an IO::WaitReadable or
+ * IO::WaitWritable exception, but return the symbol :wait_readable or
+ * :wait_writable instead.
*/
static VALUE
-ossl_ssl_accept_nonblock(VALUE self)
+ossl_ssl_accept_nonblock(int argc, VALUE *argv, VALUE self)
{
+ int no_exception = 0;
+ VALUE opts = Qnil;
+
+ rb_scan_args(argc, argv, "0:", &opts);
+
+ if (!NIL_P(opts) && Qfalse == rb_hash_aref(opts, sym_exception))
+ no_exception = 1;
+
ossl_ssl_setup(self);
- return ossl_start_ssl(self, SSL_accept, "SSL_accept", 1);
+ return ossl_start_ssl(self, SSL_accept, "SSL_accept", 1, no_exception);
}
static VALUE
@@ -2220,7 +2235,7 @@ Init_ossl_ssl(void)
rb_define_method(cSSLSocket, "connect", ossl_ssl_connect, 0);
rb_define_method(cSSLSocket, "connect_nonblock", ossl_ssl_connect_nonblock, 0);
rb_define_method(cSSLSocket, "accept", ossl_ssl_accept, 0);
- rb_define_method(cSSLSocket, "accept_nonblock", ossl_ssl_accept_nonblock, 0);
+ rb_define_method(cSSLSocket, "accept_nonblock", ossl_ssl_accept_nonblock, -1);
rb_define_method(cSSLSocket, "sysread", ossl_ssl_read, -1);
rb_define_private_method(cSSLSocket, "sysread_nonblock", ossl_ssl_read_nonblock, -1);
rb_define_method(cSSLSocket, "syswrite", ossl_ssl_write, 1);
diff --git a/ext/socket/init.c b/ext/socket/init.c
index c3f3396..b94b250 100644
--- a/ext/socket/init.c
+++ b/ext/socket/init.c
@@ -29,6 +29,7 @@ VALUE rb_cSOCKSSocket;
#endif
int rsock_do_not_reverse_lookup = 1;
+static VALUE sym_exception, sym_wait_readable;
void
rsock_raise_socket_error(const char *reason, int error)
@@ -505,11 +506,18 @@ cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len)
return ret;
}
-
VALUE
-rsock_s_accept_nonblock(VALUE klass, rb_io_t *fptr, struct sockaddr *sockaddr, socklen_t *len)
+rsock_s_accept_nonblock(int argc, VALUE *argv, VALUE klass, rb_io_t *fptr,
+ struct sockaddr *sockaddr, socklen_t *len)
{
int fd2;
+ int ex = 1;
+ VALUE opts = Qnil;
+
+ rb_scan_args(argc, argv, "0:", &opts);
+
+ if (!NIL_P(opts) && Qfalse == rb_hash_aref(opts, sym_exception))
+ ex = 0;
rb_secure(3);
rb_io_set_nonblock(fptr);
@@ -524,6 +532,8 @@ rsock_s_accept_nonblock(VALUE klass, rb_io_t *fptr, struct sockaddr *sockaddr, s
#if defined EPROTO
case EPROTO:
#endif
+ if (!ex)
+ return sym_wait_readable;
rb_readwrite_sys_fail(RB_IO_WAIT_READABLE, "accept(2) would block");
}
rb_sys_fail("accept(2)");
@@ -612,4 +622,8 @@ rsock_init_socket_init(void)
rsock_init_addrinfo();
rsock_init_sockifaddr();
rsock_init_socket_constants();
+
+#undef rb_intern
+ sym_exception = ID2SYM(rb_intern("exception"));
+ sym_wait_readable = ID2SYM(rb_intern("wait_readable"));
}
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 8beffd2..689a7a8 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -343,7 +343,7 @@ VALUE rsock_s_recvfrom(VALUE sock, int argc, VALUE *argv, enum sock_recv_type fr
int rsock_connect(int fd, const struct sockaddr *sockaddr, int len, int socks);
VALUE rsock_s_accept(VALUE klass, int fd, struct sockaddr *sockaddr, socklen_t *len);
-VALUE rsock_s_accept_nonblock(VALUE klass, rb_io_t *fptr, struct sockaddr *sockaddr, socklen_t *len);
+VALUE rsock_s_accept_nonblock(int argc, VALUE *argv, VALUE klass, rb_io_t *fptr, struct sockaddr *sockaddr, socklen_t *len);
VALUE rsock_sock_listen(VALUE sock, VALUE log);
VALUE rsock_sockopt_new(int family, int level, int optname, VALUE data);
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index eeee571..bb18409 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -894,7 +894,7 @@ sock_accept(VALUE sock)
/*
* call-seq:
- * socket.accept_nonblock => [client_socket, client_addrinfo]
+ * socket.accept_nonblock([options]) => [client_socket, client_addrinfo]
*
* Accepts an incoming connection using accept(2) after
* O_NONBLOCK is set for the underlying file descriptor.
@@ -940,19 +940,27 @@ sock_accept(VALUE sock)
* it is extended by IO::WaitReadable.
* So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock.
*
+ * By specifying `exception: false`, the options hash allows you to indicate
+ * that accept_nonblock should not raise an IO::WaitReadable exception, but
+ * return the symbol :wait_readable instead.
+ *
* === See
* * Socket#accept
*/
static VALUE
-sock_accept_nonblock(VALUE sock)
+sock_accept_nonblock(int argc, VALUE *argv, VALUE sock)
{
rb_io_t *fptr;
VALUE sock2;
union_sockaddr buf;
+ struct sockaddr *addr = &buf.addr;
socklen_t len = (socklen_t)sizeof buf;
GetOpenFile(sock, fptr);
- sock2 = rsock_s_accept_nonblock(rb_cSocket, fptr, &buf.addr, &len);
+ sock2 = rsock_s_accept_nonblock(argc, argv, rb_cSocket, fptr, addr, &len);
+
+ if (SYMBOL_P(sock2)) /* :wait_readable */
+ return sock2;
return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len));
}
@@ -2154,7 +2162,7 @@ Init_socket(void)
rb_define_method(rb_cSocket, "bind", sock_bind, 1);
rb_define_method(rb_cSocket, "listen", rsock_sock_listen, 1);
rb_define_method(rb_cSocket, "accept", sock_accept, 0);
- rb_define_method(rb_cSocket, "accept_nonblock", sock_accept_nonblock, 0);
+ rb_define_method(rb_cSocket, "accept_nonblock", sock_accept_nonblock, -1);
rb_define_method(rb_cSocket, "sysaccept", sock_sysaccept, 0);
rb_define_method(rb_cSocket, "recvfrom", sock_recvfrom, -1);
diff --git a/ext/socket/tcpserver.c b/ext/socket/tcpserver.c
index 2245a06..578377b 100644
--- a/ext/socket/tcpserver.c
+++ b/ext/socket/tcpserver.c
@@ -66,7 +66,7 @@ tcp_accept(VALUE sock)
/*
* call-seq:
- * tcpserver.accept_nonblock => tcpsocket
+ * tcpserver.accept_nonblock([options]) => tcpsocket
*
* Accepts an incoming connection using accept(2) after
* O_NONBLOCK is set for the underlying file descriptor.
@@ -93,12 +93,16 @@ tcp_accept(VALUE sock)
* it is extended by IO::WaitReadable.
* So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock.
*
+ * By specifying `exception: false`, the options hash allows you to indicate
+ * that accept_nonblock should not raise an IO::WaitReadable exception, but
+ * return the symbol :wait_readable instead.
+ *
* === See
* * TCPServer#accept
* * Socket#accept
*/
static VALUE
-tcp_accept_nonblock(VALUE sock)
+tcp_accept_nonblock(int argc, VALUE *argv, VALUE sock)
{
rb_io_t *fptr;
union_sockaddr from;
@@ -106,7 +110,7 @@ tcp_accept_nonblock(VALUE sock)
GetOpenFile(sock, fptr);
fromlen = (socklen_t)sizeof(from);
- return rsock_s_accept_nonblock(rb_cTCPSocket, fptr, &from.addr, &fromlen);
+ return rsock_s_accept_nonblock(argc, argv, rb_cTCPSocket, fptr, &from.addr, &fromlen);
}
/*
@@ -171,7 +175,7 @@ rsock_init_tcpserver(void)
*/
rb_cTCPServer = rb_define_class("TCPServer", rb_cTCPSocket);
rb_define_method(rb_cTCPServer, "accept", tcp_accept, 0);
- rb_define_method(rb_cTCPServer, "accept_nonblock", tcp_accept_nonblock, 0);
+ rb_define_method(rb_cTCPServer, "accept_nonblock", tcp_accept_nonblock, -1);
rb_define_method(rb_cTCPServer, "sysaccept", tcp_sysaccept, 0);
rb_define_method(rb_cTCPServer, "initialize", tcp_svr_init, -1);
rb_define_method(rb_cTCPServer, "listen", rsock_sock_listen, 1); /* in socket.c */
diff --git a/ext/socket/unixserver.c b/ext/socket/unixserver.c
index df98497..a38d0cb 100644
--- a/ext/socket/unixserver.c
+++ b/ext/socket/unixserver.c
@@ -59,7 +59,7 @@ unix_accept(VALUE sock)
/*
* call-seq:
- * unixserver.accept_nonblock => unixsocket
+ * unixserver.accept_nonblock([options]) => unixsocket
*
* Accepts an incoming connection using accept(2) after
* O_NONBLOCK is set for the underlying file descriptor.
@@ -86,12 +86,16 @@ unix_accept(VALUE sock)
* it is extended by IO::WaitReadable.
* So IO::WaitReadable can be used to rescue the exceptions for retrying accept_nonblock.
*
+ * By specifying `exception: false`, the options hash allows you to indicate
+ * that accept_nonblock should not raise an IO::WaitReadable exception, but
+ * return the symbol :wait_readable instead.
+ *
* === See
* * UNIXServer#accept
* * Socket#accept
*/
static VALUE
-unix_accept_nonblock(VALUE sock)
+unix_accept_nonblock(int argc, VALUE *argv, VALUE sock)
{
rb_io_t *fptr;
struct sockaddr_un from;
@@ -99,7 +103,7 @@ unix_accept_nonblock(VALUE sock)
GetOpenFile(sock, fptr);
fromlen = (socklen_t)sizeof(from);
- return rsock_s_accept_nonblock(rb_cUNIXSocket, fptr,
+ return rsock_s_accept_nonblock(argc, argv, rb_cUNIXSocket, fptr,
(struct sockaddr *)&from, &fromlen);
}
@@ -148,7 +152,7 @@ rsock_init_unixserver(void)
rb_cUNIXServer = rb_define_class("UNIXServer", rb_cUNIXSocket);
rb_define_method(rb_cUNIXServer, "initialize", unix_svr_init, 1);
rb_define_method(rb_cUNIXServer, "accept", unix_accept, 0);
- rb_define_method(rb_cUNIXServer, "accept_nonblock", unix_accept_nonblock, 0);
+ rb_define_method(rb_cUNIXServer, "accept_nonblock", unix_accept_nonblock, -1);
rb_define_method(rb_cUNIXServer, "sysaccept", unix_sysaccept, 0);
rb_define_method(rb_cUNIXServer, "listen", rsock_sock_listen, 1); /* in socket.c */
#endif
diff --git a/test/openssl/test_pair.rb b/test/openssl/test_pair.rb
index 3aca5f4..2c2776b 100644
--- a/test/openssl/test_pair.rb
+++ b/test/openssl/test_pair.rb
@@ -283,6 +283,33 @@ module OpenSSL::TestPairM
serv.close if serv && !serv.closed?
end
+ def test_accept_nonblock_no_exception
+ ctx2 = OpenSSL::SSL::SSLContext.new
+ ctx2.ciphers = "ADH"
+ ctx2.tmp_dh_callback = proc { OpenSSL::TestUtils::TEST_KEY_DH1024 }
+
+ sock1, sock2 = tcp_pair
+
+ s2 = OpenSSL::SSL::SSLSocket.new(sock2, ctx2)
+ accepted = s2.accept_nonblock(exception: false)
+ assert_equal :wait_readable, accepted
+
+ ctx1 = OpenSSL::SSL::SSLContext.new
+ ctx1.ciphers = "ADH"
+ s1 = OpenSSL::SSL::SSLSocket.new(sock1, ctx1)
+ th = Thread.new { s1.connect }
+ until th.join(0.01)
+ accepted = s2.accept_nonblock(exception: false)
+ assert_includes([s2, :wait_readable, :wait_writable ], accepted)
+ end
+ ensure
+ s1.close if s1
+ s2.close if s2
+ sock1.close if sock1
+ sock2.close if sock2
+ accepted.close if accepted.respond_to?(:close)
+ end
+
def test_connect_accept_nonblock
ctx = OpenSSL::SSL::SSLContext.new()
ctx.ciphers = "ADH"
diff --git a/test/socket/test_nonblock.rb b/test/socket/test_nonblock.rb
index 882e438..94ed198 100644
--- a/test/socket/test_nonblock.rb
+++ b/test/socket/test_nonblock.rb
@@ -13,6 +13,8 @@ class TestSocketNonblock < Test::Unit::TestCase
serv.bind(Socket.sockaddr_in(0, "127.0.0.1"))
serv.listen(5)
assert_raise(IO::WaitReadable) { serv.accept_nonblock }
+ assert_equal :wait_readable, serv.accept_nonblock(exception: false)
+ assert_raise(IO::WaitReadable) { serv.accept_nonblock(exception: true) }
c = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
c.connect(serv.getsockname)
begin
diff --git a/test/socket/test_tcp.rb b/test/socket/test_tcp.rb
index 7328897..a6c332c 100644
--- a/test/socket/test_tcp.rb
+++ b/test/socket/test_tcp.rb
@@ -76,4 +76,12 @@ class TestSocket_TCPSocket < Test::Unit::TestCase
th.join
}
end
+
+ def test_accept_nonblock
+ TCPServer.open("localhost", 0) {|svr|
+ assert_raises(IO::WaitReadable) { svr.accept_nonblock }
+ assert_equal :wait_readable, svr.accept_nonblock(exception: false)
+ assert_raises(IO::WaitReadable) { svr.accept_nonblock(exception: true) }
+ }
+ end
end if defined?(TCPSocket)
diff --git a/test/socket/test_unix.rb b/test/socket/test_unix.rb
index 866c839..829eaa9 100644
--- a/test/socket/test_unix.rb
+++ b/test/socket/test_unix.rb
@@ -663,4 +663,11 @@ class TestSocket_UNIXSocket < Test::Unit::TestCase
assert(s0.closed?)
end
+ def test_accept_nonblock
+ bound_unix_socket(UNIXServer) {|serv, path|
+ assert_raises(IO::WaitReadable) { serv.accept_nonblock }
+ assert_raises(IO::WaitReadable) { serv.accept_nonblock(exception: true) }
+ assert_equal :wait_readable, serv.accept_nonblock(exception: false)
+ }
+ end
end if defined?(UNIXSocket) && /cygwin/ !~ RUBY_PLATFORM