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Bug #11319
closed"w+" is interpreted as "r+" when reopening stdio streams
Description
diff --git a/io.c b/io.c
index dfdb422..8358c74 100644
--- a/io.c
+++ b/io.c
@@ -5046,6 +5046,9 @@ rb_io_oflags_modestr(int oflags)
case O_WRONLY:
return MODE_BINARY("w", "wb");
case O_RDWR:
+ if (oflags & O_TRUNC) {
+ return MODE_BINARY("w+", "wb+");
+ }
return MODE_BINARY("r+", "rb+");
}
}
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 9b3e801..1662ac0 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2069,6 +2069,15 @@ End
}
end
+ def test_reopen_stdio
+ mkcdtmpdir {
+ fname = 'bug11319'
+ File.write(fname, 'hello')
+ system(EnvUtil.rubybin, '-e', "STDOUT.reopen('#{fname}', 'w+')")
+ assert_equal('', File.read(fname))
+ }
+ end
+
def test_reopen_mode
feature7067 = '[ruby-core:47694]'
make_tempfile {|t|
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