From aea2bbcbe50b64b9f4294002e9822e0444e2b13a Mon Sep 17 00:00:00 2001
From: Asmod4n <791770+Asmod4n@users.noreply.github.com>
Date: Thu, 14 May 2026 09:53:18 +0200
Subject: [PATCH 1/2] add IO#autoclose= and IO#autoclose?

---
 mrbgems/mruby-io/README.md  |  4 ++--
 mrbgems/mruby-io/src/io.c   | 47 +++++++++++++++++++++++++++++++++++++
 mrbgems/mruby-io/test/io.rb | 10 ++++++++
 3 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/mrbgems/mruby-io/README.md b/mrbgems/mruby-io/README.md
index 597aeee98..390289e29 100644
--- a/mrbgems/mruby-io/README.md
+++ b/mrbgems/mruby-io/README.md
@@ -33,8 +33,8 @@ Add the line below to your build configuration.
 | IO.write                   |          |          |
 | IO#<<                      |          |          |
 | IO#advise                  |          |          |
-| IO#autoclose=              |          |          |
-| IO#autoclose?              |          |          |
+| IO#autoclose=              | o        |          |
+| IO#autoclose?              | o        |          |
 | IO#binmode                 |          |          |
 | IO#binmode?                |          |          |
 | IO#bytes                   |          | obsolete |
diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 196ab1a90..8c01c8de6 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -2205,6 +2205,51 @@ io_flush(mrb_state *mrb, mrb_value io)
   return io;
 }
 
+/*
+ * call-seq:
+ *   ios.autoclose = bool -> bool
+ *
+ * Sets the autoclose flag.
+ *
+ * If the autoclose flag is set, the underlying file descriptor(s) of +ios+
+ * will be closed when +ios+ is closed (explicitly via +#close+, or implicitly
+ * when the +IO+ object is garbage-collected). When unset, the file
+ * descriptor(s) are left open.
+ *
+ *   f = File.open("testfile")
+ *   IO.for_fd(f.fileno).autoclose = false
+ */
+static mrb_value
+io_set_autoclose(mrb_state *mrb, mrb_value io)
+{
+  struct mrb_io *fptr = io_get_open_fptr(mrb, io);
+  mrb_bool b;
+
+  mrb_get_args(mrb, "b", &b);
+  fptr->close_fd = b;
+  fptr->close_fd2 = b;
+  return mrb_bool_value(b);
+}
+
+/*
+ * call-seq:
+ *   ios.autoclose? -> true or false
+ *
+ * Returns +true+ if the underlying file descriptor of +ios+ will be closed
+ * when +ios+ is closed ( via finalization), otherwise +false+.
+ *
+ *   f = File.open("testfile")
+ *   f.autoclose?         #=> true
+ *   f.autoclose = false
+ *   f.autoclose?         #=> false
+ */
+static mrb_value
+io_autoclose_p(mrb_state *mrb, mrb_value io)
+{
+  struct mrb_io *fptr = io_get_open_fptr(mrb, io);
+  return mrb_bool_value(fptr->close_fd);
+}
+
 /* ---------------------------*/
 static const mrb_mt_entry io_rom_entries[] = {
   MRB_MT_ENTRY(io_init,              MRB_SYM(initialize), MRB_ARGS_ARG(1,2)),
@@ -2243,6 +2288,8 @@ static const mrb_mt_entry io_rom_entries[] = {
   MRB_MT_ENTRY(io_pwrite,            MRB_SYM(pwrite), MRB_ARGS_ANY()),  /* Ruby 2.5 feature */
   MRB_MT_ENTRY(io_getbyte,           MRB_SYM(getbyte),       MRB_ARGS_NONE()),
   MRB_MT_ENTRY(io_readbyte,          MRB_SYM(readbyte),      MRB_ARGS_NONE()),
+  MRB_MT_ENTRY(io_set_autoclose,     MRB_SYM_E(autoclose),   MRB_ARGS_REQ(1)),
+  MRB_MT_ENTRY(io_autoclose_p,       MRB_SYM_Q(autoclose),   MRB_ARGS_NONE()),
 };
 
 void
diff --git a/mrbgems/mruby-io/test/io.rb b/mrbgems/mruby-io/test/io.rb
index 38af70e9a..2aa7480db 100644
--- a/mrbgems/mruby-io/test/io.rb
+++ b/mrbgems/mruby-io/test/io.rb
@@ -665,4 +665,14 @@ assert('`cmd`') do
   end
 end
 
+assert('IO#autoclose?, IO#autoclose=') do
+  io = IO.new(IO.sysopen($mrbtest_io_rfname), "r")
+  assert_true io.autoclose?
+  io.autoclose = false
+  assert_false io.autoclose?
+  io.autoclose = true
+  assert_true io.autoclose?
+  io.close
+end
+
 MRubyIOTestUtil.io_test_cleanup

From 9eb8865a8a35ea0209aafd5c04fa9980f667cb77 Mon Sep 17 00:00:00 2001
From: Hendrik <Asmod4n@users.noreply.github.com>
Date: Thu, 14 May 2026 09:57:26 +0200
Subject: [PATCH 2/2] Fix documentation for autoclose? method

---
 mrbgems/mruby-io/src/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 8c01c8de6..e38545c2c 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -2236,7 +2236,7 @@ io_set_autoclose(mrb_state *mrb, mrb_value io)
  *   ios.autoclose? -> true or false
  *
  * Returns +true+ if the underlying file descriptor of +ios+ will be closed
- * when +ios+ is closed ( via finalization), otherwise +false+.
+ * when +ios+ is closed, otherwise +false+.
  *
  *   f = File.open("testfile")
  *   f.autoclose?         #=> true