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author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-04-03 00:10:50 +0000 |
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committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-04-03 00:10:50 +0000 |
commit | 8109114b18f76d8427f701c3705186632609be01 (patch) | |
tree | 8b594418d120c01d7ff66fd21bac3a6c5d9ac247 /test/ruby/test_io.rb | |
parent | 78ad438f0aab566e0e8153536dadbd67e5f0b6ad (diff) | |
download | ruby-8109114b18f76d8427f701c3705186632609be01.tar.gz |
Add IO#pread and IO#pwrite methods
These methods are useful for safe/concurrent file I/O in
multi-thread/process environments and also fairly standard
nowadays especially in systems supporting pthreads.
Based on patches by Avseyev <sergey.avseyev@gmail.com> at
[ruby-core:79290]. [Feature #4532]
* configure.in: check for pwrite(2). pread() is already used
internally for IO.copy_stream.
* io.c: implement wrappers for pread(2) and pwrite(2) and expose
them in IO.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58240 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'test/ruby/test_io.rb')
-rw-r--r-- | test/ruby/test_io.rb | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb index ca3f1e2d3b..d6cbf205e9 100644 --- a/test/ruby/test_io.rb +++ b/test/ruby/test_io.rb @@ -3525,5 +3525,26 @@ __END__ end end end + + def test_pread + make_tempfile { |t| + open(t.path) do |f| + assert_equal("bar", f.pread(3, 4)) + buf = "asdf" + assert_equal("bar", f.pread(3, 4, buf)) + assert_equal("bar", buf) + assert_raise(EOFError) { f.pread(1, f.size) } + end + } + end if IO.method_defined?(:pread) + + def test_pwrite + make_tempfile { |t| + open(t.path, IO::RDWR) do |f| + assert_equal(3, f.pwrite(4, "ooo")) + assert_equal("ooo", f.pread(3, 4)) + end + } + end if IO.method_defined?(:pread) and IO.method_defined?(:pwrite) end end |