From 5c49ef2116a12adf93ca626343fdcd1a5cc6af08 Mon Sep 17 00:00:00 2001
From: Greg Ward <gward@python.net>
Date: Tue, 11 Mar 2003 16:53:13 +0000
Subject: Open with O_NONBLOCK to avoid hanging on open().

---
 Modules/ossaudiodev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Modules/ossaudiodev.c b/Modules/ossaudiodev.c
index 2f4693d..0777840 100644
--- a/Modules/ossaudiodev.c
+++ b/Modules/ossaudiodev.c
@@ -131,7 +131,11 @@ newossobject(PyObject *arg)
           basedev = "/dev/dsp";
     }
 
-    if ((fd = open(basedev, imode)) == -1) {
+    /* Open with O_NONBLOCK to avoid hanging on devices that only allow
+       one open at a time.  This does *not* affect later I/O; OSS
+       provides a special ioctl() for non-blocking read/write, which is
+       exposed via oss_nonblock() below. */
+    if ((fd = open(basedev, imode|O_NONBLOCK)) == -1) {
         PyErr_SetFromErrnoWithFilename(PyExc_IOError, basedev);
         return NULL;
     }
-- 
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