From c5daeee2949d10372f94dd6f85aa61f337986cfd Mon Sep 17 00:00:00 2001
From: Alexandre Ratchov <alex@caoua.org>
Date: Fri, 4 Nov 2016 19:12:07 +0100
Subject: [PATCH] On OSS/FreeBSD, set poll(2) threshold to 1 byte, so that it
 returs POLLIN/POLLOUT whenever read/write can be called without blocking. By
 default OSS use 1 block of threshold.

---
 libsndio/sio_oss.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libsndio/sio_oss.c b/libsndio/sio_oss.c
index 85045a9..75b5124 100644
--- a/libsndio/sio_oss.c
+++ b/libsndio/sio_oss.c
@@ -232,7 +232,7 @@ sio_oss_getfd(const char *str, unsigned int mode, int nbio)
 	const char *p;
 	char path[DEVPATH_MAX];
 	unsigned int devnum;
-	int fd, flags;
+	int fd, flags, val;
 
 	p = _sndio_parsetype(str, "rsnd");
 	if (p == NULL) {
@@ -263,6 +263,12 @@ sio_oss_getfd(const char *str, unsigned int mode, int nbio)
 		DPERROR(path);
 		return -1;
 	}
+	val = 1;
+	if (ioctl(fd, SNDCTL_DSP_LOW_WATER, &val) < 0) {
+		DPERROR("sio_oss_start: LOW_WATER");
+		close(fd);
+		return -1;
+	}
 	return fd;
 }