/******************************************************************************

    AudioScience HPI driver
    Copyright (C) 1997-2011  AudioScience Inc. <support@audioscience.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of version 2 of the GNU General Public License as
    published by the Free Software Foundation;

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 Hardware Programming Interface (HPI) Utility functions

 (C) Copyright AudioScience Inc. 2007
*******************************************************************************/
/* Initialise response headers, or msg/response pairs.
Note that it is valid to just init a response e.g. when a lower level is
preparing a response to a message.
However, when sending a message, a matching response buffer must always be
prepared.
*/

#ifndef _HPIMSGINIT_H_
#define _HPIMSGINIT_H_

void hpi_init_response(struct hpi_response *phr, u16 object, u16 function,
	u16 error);

void hpi_init_message_response(struct hpi_message *phm,
	struct hpi_response *phr, u16 object, u16 function);

void hpi_init_responseV1(struct hpi_response_header *phr, u16 size,
	u16 object, u16 function);

void hpi_init_message_responseV1(struct hpi_message_header *phm, u16 msg_size,
	struct hpi_response_header *phr, u16 res_size, u16 object,
	u16 function);

#endif				/* _HPIMSGINIT_H_ */
/a><a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/codecs/wm5100.h?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/wm5100.h?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/codecs/wm5100.h?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/sound/soc/codecs/wm5100.h'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/codecs?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>codecs</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/codecs/wm5100.h?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804'>wm5100.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/codecs/wm5100.h?h=nds-private-remove&amp;id=e7fe9491261ee07b0c7456df42c34ca6a8538804&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
 is impossible to get a path and a mount point
for a socket file. socket_diag reports address, device ID and inode
number for unix sockets. An address can contain a relative path or
a file may be moved somewhere. And these properties say nothing about
a mount namespace and a mount point of a socket file.

With the introduced ioctl, we can get a path by reading
/proc/self/fd/X and get mnt_id from /proc/self/fdinfo/X.

In CRIU we are going to use this ioctl to dump and restore unix socket.

Here is an example how it can be used:

$ strace -e socket,bind,ioctl ./test /tmp/test_sock
socket(AF_UNIX, SOCK_STREAM, 0)         = 3
bind(3, {sa_family=AF_UNIX, sun_path="test_sock"}, 11) = 0
ioctl(3, SIOCUNIXFILE, 0)           = 4
^Z

$ ss -a | grep test_sock
u_str  LISTEN     0      1      test_sock 17798                 * 0

$ ls -l /proc/760/fd/{3,4}
lrwx------ 1 root root 64 Feb  1 09:41 3 -&gt; 'socket:[17798]'
l--------- 1 root root 64 Feb  1 09:41 4 -&gt; /tmp/test_sock

$ cat /proc/760/fdinfo/4
pos:	0
flags:	012000000
mnt_id:	40

$ cat /proc/self/mountinfo | grep "^40\s"
40 19 0:37 / /tmp rw shared:23 - tmpfs tmpfs rw

Signed-off-by: Andrei Vagin &lt;avagin@openvz.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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