* io.c (io_read_nonblock): support non-blocking reads without raising

  exceptions. As in: `io.read_nonblock(size, exception: false)`
  [ruby-core:38666] [Feature #5138]
* ext/openssl/ossl_ssl.c (ossl_ssl_read_internal): ditto
* ext/stringio/stringio.c (strio_sysread): ditto
* io.c (rb_io_write_nonblock): support non-blocking writes without
  raising an exception.
* ext/openssl/ossl_ssl.c (ossl_ssl_write_internal): ditto
* test/openssl/test_pair.rb (class OpenSSL): tests
* test/ruby/test_io.rb (class TestIO): ditto
* test/socket/test_nonblock.rb (class TestSocketNonblock): ditto
* test/stringio/test_stringio.rb (class TestStringIO): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42695 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/socket/test_nonblock.rb b/test/socket/test_nonblock.rb
index d494f91c41..e395a0ad31 100644
--- a/test/socket/test_nonblock.rb
+++ b/test/socket/test_nonblock.rb
@@ -190,6 +190,20 @@ class TestSocketNonblock < Test::Unit::TestCase
     s.close if s
   end
 
+  def test_read_nonblock_no_exception
+    c, s = tcp_pair
+    assert_equal :wait_readable, c.read_nonblock(100, exception: false)
+    assert_equal :wait_readable, s.read_nonblock(100, exception: false)
+    c.write("abc")
+    IO.select [s]
+    assert_equal("a", s.read_nonblock(1, exception: false))
+    assert_equal("bc", s.read_nonblock(100, exception: false))
+    assert_equal :wait_readable, s.read_nonblock(100, exception: false)
+  ensure
+    c.close if c
+    s.close if s
+  end
+
 =begin
   def test_write_nonblock
     c, s = tcp_pair