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-rw-r--r--ext/IO/IO.xs2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/IO/IO.xs b/ext/IO/IO.xs
index 2eb16f40ec..e558d5c4e0 100644
--- a/ext/IO/IO.xs
+++ b/ext/IO/IO.xs
@@ -271,6 +271,8 @@ setvbuf(handle, buf, type, size)
CODE:
/* Should check HAS_SETVBUF once Configure tests for that */
#if defined(PERLIO_IS_STDIO) && defined(_IOFBF)
+ if (!handle) /* Try input stream. */
+ handle = IoIFP(sv_2io(ST(0)));
if (handle)
RETVAL = setvbuf(handle, buf, type, size);
else {