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-rw-r--r--libio/iofopncook.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libio/iofopncook.c b/libio/iofopncook.c
index 56f2239764..419b02d6da 100644
--- a/libio/iofopncook.c
+++ b/libio/iofopncook.c
@@ -75,7 +75,8 @@ _IO_cookie_seek (fp, offset, dir)
struct _IO_cookie_file *cfile = (struct _IO_cookie_file *) fp;
return ((cfile->__io_functions.seek == NULL
- || cfile->__io_functions.seek (cfile->__cookie, &offset, dir))
+ || (cfile->__io_functions.seek (cfile->__cookie, &offset, dir)
+ == (_IO_off64_t) -1))
? _IO_pos_BAD : offset);
}