tun/tun.patch@085c98460a58 (annotated)
tun/tun.patch
Thu, 02 Aug 2012 00:01:34 +0200
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 02 Aug 2012 00:01:34 +0200
- changeset 439
- 085c98460a58
- child 667
- 9dacbd1d1aa2
- permissions
- -rw-r--r--
Use upstream man pages to avoid local help2man failures, likely due to
shell capability assumptions or cross platform environment variance.
The upstream man pages are probably better formatted anyway.
| michael@75 | 1 | Index: linux/2.2/tun.c |
| michael@75 | 2 | --- linux/2.2/tun.c.orig 2006-10-10 14:45:00.338589000 +0200 |
| michael@75 | 3 | +++ linux/2.2/tun.c 2006-10-10 14:44:05.695404000 +0200 |
| michael@75 | 4 | @@ -178,10 +178,22 @@ |
| michael@75 | 5 | |
| michael@75 | 6 | DBG( KERN_INFO "%s: tun_chr_poll\n", tun->name); |
| michael@75 | 7 | |
| michael@75 | 8 | + /* Data written to the /dev/tunX device is immediately placed into a socket buffer, making it |
| michael@75 | 9 | + * available to networking code at the tunX interface. Writes never block. |
| michael@75 | 10 | + * Likewise, data flows from the network stack, through the tunX interface and into the /dev/tun* device, |
| michael@75 | 11 | + * where it is queued, making it available for read(). |
| michael@75 | 12 | + * Thus the character device /dev/tunX is: |
| michael@75 | 13 | + * - readable if data was "transmitted" to the tunX interface and is now queued at the /dev/tunX device. |
| michael@75 | 14 | + * - always writable. |
| michael@75 | 15 | + * Everything written here is equally true of taps. |
| michael@75 | 16 | + * The author made a mistake when implementing this routine; he forgot that the device is always writable. |
| michael@75 | 17 | + * -jeff stearns 22-Dec-2005 |
| michael@75 | 18 | + */ |
| michael@75 | 19 | + |
| michael@75 | 20 | poll_wait(file, &tun->read_wait, wait); |
| michael@75 | 21 | |
| michael@75 | 22 | if( skb_queue_len(&tun->txq) ) |
| michael@75 | 23 | - return POLLIN | POLLRDNORM; |
| michael@75 | 24 | + return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM; |
| michael@75 | 25 | |
| michael@75 | 26 | return POLLOUT | POLLWRNORM; |
| michael@75 | 27 | } |
| michael@75 | 28 | Index: linux/2.4/tun.c |
| michael@75 | 29 | --- linux/2.4/tun.c.orig 2006-10-10 14:41:57.910408000 +0200 |
| michael@75 | 30 | +++ linux/2.4/tun.c 2006-10-10 14:43:40.067700000 +0200 |
| michael@75 | 31 | @@ -176,9 +176,21 @@ |
| michael@75 | 32 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->name); |
| michael@75 | 33 | |
| michael@75 | 34 | poll_wait(file, &tun->read_wait, wait); |
| michael@75 | 35 | + |
| michael@75 | 36 | + /* Data written to the /dev/tunX device is immediately placed into a socket buffer, making it |
| michael@75 | 37 | + * available to networking code at the tunX interface. Writes never block. |
| michael@75 | 38 | + * Likewise, data flows from the network stack, through the tunX interface and into the /dev/tun* device, |
| michael@75 | 39 | + * where it is queued, making it available for read(). |
| michael@75 | 40 | + * Thus the character device /dev/tunX is: |
| michael@75 | 41 | + * - readable if data was "transmitted" to the tunX interface and is now queued at the /dev/tunX device. |
| michael@75 | 42 | + * - always writable. |
| michael@75 | 43 | + * Everything written here is equally true of taps. |
| michael@75 | 44 | + * The author made a mistake when implementing this routine; he forgot that the device is always writable. |
| michael@75 | 45 | + * -jeff stearns 22-Dec-2005 |
| michael@75 | 46 | + */ |
| michael@75 | 47 | |
| michael@75 | 48 | if (skb_queue_len(&tun->txq)) |
| michael@75 | 49 | - return POLLIN | POLLRDNORM; |
| michael@75 | 50 | + return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM; |
| michael@75 | 51 | |
| michael@75 | 52 | return POLLOUT | POLLWRNORM; |
| michael@75 | 53 | } |
