https://git.ruby-lang.org/ruby.git/commit/?id=243320d22f

From 243320d22fcd0b9b7ee4cc5b1b420dcd63d87f5f Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Sat, 1 Jan 2022 20:23:47 +1300
Subject: Fix incorrect minimum read length. (#5353)

---
 io.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/io.c b/io.c
index deb5a7950e3..3fab54e4067 100644
--- a/io.c
+++ b/io.c
@@ -1133,14 +1133,10 @@ rb_read_internal(rb_io_t *fptr, void *buf, size_t count) https://github.com/ruby/ruby/blob/trunk/io.c#L1133
 {
     VALUE scheduler = rb_fiber_scheduler_current();
     if (scheduler != Qnil) {
-        VALUE result = rb_fiber_scheduler_io_read_memory(scheduler, fptr->self, buf, count, count);
+        VALUE result = rb_fiber_scheduler_io_read_memory(scheduler, fptr->self, buf, count, 0);
 
         if (result != Qundef) {
-            ssize_t length = rb_fiber_scheduler_io_result_apply(result);
-
-            if (length < 0) rb_sys_fail_path(fptr->pathv);
-
-            return length;
+            return rb_fiber_scheduler_io_result_apply(result);
         }
     }
 
-- 
cgit v1.2.1


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