From: David Schleef <ds@schleef.org>
Date: Tue, 13 Mar 2001 09:25:45 +0000 (+0000)
Subject: added comedi_poll()
X-Git-Tag: r0_7_58~62
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=9953b1e1ac35d0bd23e090371c4bce2c2a2398fb;p=comedi.git

added comedi_poll()
---

diff --git a/comedi/kcomedilib/kcomedilib_main.c b/comedi/kcomedilib/kcomedilib_main.c
index fd694ec9..6fa22948 100644
--- a/comedi/kcomedilib/kcomedilib_main.c
+++ b/comedi/kcomedilib/kcomedilib_main.c
@@ -908,3 +908,32 @@ int comedi_register_callback(unsigned int minor,unsigned int subdev,
 }
 
 
+int comedi_poll(unsigned int minor, unsigned int subdev)
+{
+	comedi_device *dev;
+	comedi_subdevice *s;
+	comedi_async *async;
+	int ret;
+
+	if((ret=minor_to_dev(minor,&dev))<0)
+		return ret;
+
+	if(subdev>=dev->n_subdevices)
+		return -ENODEV;
+
+	s=dev->subdevices+subdev;
+	async = s->async;
+	if(s->type==COMEDI_SUBD_UNUSED || !async)
+		return -EIO;
+
+	/* are we locked? (ioctl lock) */
+	if(s->lock && s->lock!=&rtcomedi_lock_semaphore)
+		return -EACCES;
+
+	/* are we running? XXX wrong? */
+	if(!s->busy)
+		return -EIO;
+
+	return s->poll(dev,s);
+}
+