Make pfinet try both a filepath and kernel device

pfinet/ethernet.c (ethernet_open): Try to file_name_lookup() the device as
filepath before opening the Mach device.

1 files changed, 27 insertions, 8 deletions

diff --git a/pfinet/ethernet.c b/pfinet/ethernet.c
index dab5c56f..f3669190 100644
--- a/pfinet/ethernet.c
+++ b/pfinet/ethernet.c
@@ -166,14 +166,33 @@ ethernet_open (struct device *dev)
 
   mach_port_set_qlimit (mach_task_self (), edev->readptname, MACH_PORT_QLIMIT_MAX);
 
-  err = get_privileged_ports (0, &master_device);
-  if (err)
-    error (2, err, "cannot get device master port");
-
-  err = device_open (master_device, D_WRITE | D_READ, dev->name, &edev->ether_port);
-  mach_port_deallocate (mach_task_self (), master_device);
-  if (err)
-    error (2, err, "%s", dev->name);
+  master_device = file_name_lookup (dev->name, O_READ | O_WRITE, 0);
+  if (master_device != MACH_PORT_NULL)
+    {
+      /* The device name here is the path of a device file.  */
+      err = device_open (master_device, D_WRITE | D_READ, "eth", &edev->ether_port);
+      mach_port_deallocate (mach_task_self (), master_device);
+      if (err)
+	error (2, err, "%s", dev->name);
+    }
+  else
+    {
+      /* No, perhaps a Mach device?  */
+      int file_errno = errno;
+      err = get_privileged_ports (0, &master_device);
+      if (err)
+	{
+	  error (0, errno, "file_name_lookup %s", dev->name);
+	  error (2, err, "and cannot get device master port");
+	}
+      err = device_open (master_device, D_WRITE | D_READ, dev->name, &edev->ether_port);
+      mach_port_deallocate (mach_task_self (), master_device);
+      if (err)
+	{
+	  error (0, errno, "file_name_lookup %s", dev->name);
+	  error (2, err, "%s", dev->name);
+	}
+    }
 
   err = device_set_filter (edev->ether_port, ports_get_right (edev->readpt),
 			   MACH_MSG_TYPE_MAKE_SEND, 0,