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-rw-r--r--ext/pty/pty.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/ext/pty/pty.c b/ext/pty/pty.c
index 76da867a48..d190aba94f 100644
--- a/ext/pty/pty.c
+++ b/ext/pty/pty.c
@@ -412,13 +412,13 @@ pty_open(VALUE klass)
master_io = rb_obj_alloc(rb_cIO);
MakeOpenFile(master_io, master_fptr);
- master_fptr->mode = rb_io_mode_flags("r+");
+ master_fptr->mode = FMODE_READWRITE | FMODE_SYNC | FMODE_DUPLEX;
master_fptr->fd = master_fd;
master_fptr->pathv = rb_obj_freeze(rb_sprintf(" pty %s", slavename));
slave_file = rb_obj_alloc(rb_cFile);
MakeOpenFile(slave_file, slave_fptr);
- slave_fptr->mode = rb_io_mode_flags("r+");
+ slave_fptr->mode = FMODE_READWRITE | FMODE_SYNC | FMODE_DUPLEX | FMODE_TTY;
slave_fptr->fd = slave_fd;
slave_fptr->pathv = rb_obj_freeze(rb_str_new_cstr(slavename));