From 30f661951bb19f69cf55388c76ecaf7b0be41079 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@ruby-lang.org>
Date: Sun, 2 Nov 2025 13:28:40 +0900
Subject: merge revision(s) 12350eb9e0d3317da57b5a37c0c2810946b48850: [Backport
 #21625]

	[PATCH] [Bug #21625] Allow io/wait methods with `IO#ungetc` in text mode
---
 ext/io/wait/wait.c                    |  8 ++++----
 io.c                                  |  4 ++--
 test/io/wait/test_io_wait_uncommon.rb | 30 ++++++++++++++++++++++++++++++
 version.h                             |  2 +-
 4 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/ext/io/wait/wait.c b/ext/io/wait/wait.c
index 8835670e59..255b12d236 100644
--- a/ext/io/wait/wait.c
+++ b/ext/io/wait/wait.c
@@ -84,7 +84,7 @@ io_nread(VALUE io)
     ioctl_arg n;
 
     GetOpenFile(io, fptr);
-    rb_io_check_readable(fptr);
+    rb_io_check_char_readable(fptr);
     len = rb_io_read_pending(fptr);
     if (len > 0) return INT2FIX(len);
 
@@ -143,7 +143,7 @@ io_ready_p(VALUE io)
 #endif
 
     GetOpenFile(io, fptr);
-    rb_io_check_readable(fptr);
+    rb_io_check_char_readable(fptr);
     if (rb_io_read_pending(fptr)) return Qtrue;
 
 #ifndef HAVE_RB_IO_WAIT
@@ -178,7 +178,7 @@ io_wait_readable(int argc, VALUE *argv, VALUE io)
 #endif
 
     GetOpenFile(io, fptr);
-    rb_io_check_readable(fptr);
+    rb_io_check_char_readable(fptr);
 
 #ifndef HAVE_RB_IO_WAIT
     tv = get_timeout(argc, argv, &timerec);
@@ -252,7 +252,7 @@ io_wait_priority(int argc, VALUE *argv, VALUE io)
     rb_io_t *fptr = NULL;
 
     RB_IO_POINTER(io, fptr);
-    rb_io_check_readable(fptr);
+    rb_io_check_char_readable(fptr);
 
     if (rb_io_read_pending(fptr)) return Qtrue;
 
diff --git a/io.c b/io.c
index b4b262b6ac..70d6ed0b2c 100644
--- a/io.c
+++ b/io.c
@@ -9744,7 +9744,7 @@ io_wait_readable(int argc, VALUE *argv, VALUE io)
     rb_io_t *fptr;
 
     RB_IO_POINTER(io, fptr);
-    rb_io_check_readable(fptr);
+    rb_io_check_char_readable(fptr);
 
     if (rb_io_read_pending(fptr)) return Qtrue;
 
@@ -9791,7 +9791,7 @@ io_wait_priority(int argc, VALUE *argv, VALUE io)
     rb_io_t *fptr = NULL;
 
     RB_IO_POINTER(io, fptr);
-    rb_io_check_readable(fptr);
+    rb_io_check_char_readable(fptr);
 
     if (rb_io_read_pending(fptr)) return Qtrue;
 
diff --git a/test/io/wait/test_io_wait_uncommon.rb b/test/io/wait/test_io_wait_uncommon.rb
index 0f922f4e24..0f97ac35d9 100644
--- a/test/io/wait/test_io_wait_uncommon.rb
+++ b/test/io/wait/test_io_wait_uncommon.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 require 'test/unit'
+require 'io/wait'
 
 # test uncommon device types to check portability problems
 # We may optimize IO#wait_*able for non-Linux kernels in the future
@@ -74,4 +75,33 @@ class TestIOWaitUncommon < Test::Unit::TestCase
   def test_wait_writable_null
     check_dev(IO::NULL, :wait_writable)
   end
+
+  def test_after_ungetc_ready?
+    check_dev(IO::NULL, mode: "r") {|fp|
+      assert_respond_to fp, :ready?
+      fp.ungetc(?a)
+      assert_predicate fp, :ready?
+    }
+  end
+
+  def test_after_ungetc_wait_readable
+    check_dev(IO::NULL, mode: "r") {|fp|
+      fp.ungetc(?a)
+      assert_predicate fp, :wait_readable
+    }
+  end
+
+  def test_after_ungetc_in_text_ready?
+    check_dev(IO::NULL, mode: "rt") {|fp|
+      fp.ungetc(?a)
+      assert_predicate fp, :ready?
+    }
+  end
+
+  def test_after_ungetc_in_text_wait_readable
+    check_dev(IO::NULL, mode: "rt") {|fp|
+      fp.ungetc(?a)
+      assert_predicate fp, :wait_readable
+    }
+  end
 end
diff --git a/version.h b/version.h
index 79081b4b14..346e87c202 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 10
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 184
+#define RUBY_PATCHLEVEL 185
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"
-- 
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