* [PATCH] doc: tests and examples for changing pipe size in Linux
@ 2017-03-22 7:19 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2017-03-22 7:19 UTC (permalink / raw)
To: sleepy-penguin
We will not implement "pipe_size" as an accessor in a core
class like the "io_splice" RubyGem did.
---
ext/sleepy_penguin/splice.c | 10 ++++++++++
test/test_pipesize.rb | 22 ++++++++++++++++++++++
2 files changed, 32 insertions(+)
create mode 100644 test/test_pipesize.rb
diff --git a/ext/sleepy_penguin/splice.c b/ext/sleepy_penguin/splice.c
index d291796..ab8c1ff 100644
--- a/ext/sleepy_penguin/splice.c
+++ b/ext/sleepy_penguin/splice.c
@@ -149,6 +149,10 @@ void sleepy_penguin_init_splice(void)
* fcntl() command constant used to return the size of a pipe.
* This constant is only defined when running Linux 2.6.35
* or later.
+ *
+ * require 'fcntl'
+ * r, w = IO.pipe
+ * r.fcntl(SleepyPenguin::F_GETPIPE_SZ) => Integer
*/
rb_define_const(mod, "F_GETPIPE_SZ", UINT2NUM(F_GETPIPE_SZ));
@@ -156,6 +160,12 @@ void sleepy_penguin_init_splice(void)
* fcntl() command constant used to set the size of a pipe.
* This constant is only defined when running Linux 2.6.35
* or later.
+ *
+ * call-seq:
+ *
+ * require 'fcntl'
+ * r, w = IO.pipe
+ * r.fcntl(SleepyPenguin::F_SETPIPE_SZ, 131072)
*/
rb_define_const(mod, "F_SETPIPE_SZ", UINT2NUM(F_SETPIPE_SZ));
diff --git a/test/test_pipesize.rb b/test/test_pipesize.rb
new file mode 100644
index 0000000..c9ff143
--- /dev/null
+++ b/test/test_pipesize.rb
@@ -0,0 +1,22 @@
+# -*- encoding: binary -*-
+require_relative 'helper'
+require 'fcntl'
+
+class TestPipesize < Test::Unit::TestCase
+ def test_pipe_size
+ return unless RUBY_PLATFORM =~ /linux/
+ [ :F_GETPIPE_SZ, :F_SETPIPE_SZ ].each do |c|
+ return unless SleepyPenguin.const_defined?(c)
+ end
+ r, w = pipe = IO.pipe
+ nr = r.fcntl(SleepyPenguin::F_GETPIPE_SZ)
+ assert_kind_of Integer, nr
+ assert_operator nr, :>, 0
+
+ set = 131072
+ r.fcntl(SleepyPenguin::F_SETPIPE_SZ, set)
+ assert_equal set, r.fcntl(SleepyPenguin::F_GETPIPE_SZ)
+ ensure
+ pipe.each(&:close) if pipe
+ end
+end
--
EW
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2017-03-22 7:19 [PATCH] doc: tests and examples for changing pipe size in Linux Eric Wong
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