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Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced [message #47559 is a reply to message #47558]

Wed, 15 August 2012 21:25

ebiederm
Messages: 1354
Registered: February 2006

Senior Member

"H. Peter Anvin" <hpa@zytor.com> writes:

> On 08/15/2012 12:49 PM, Eric W. Biederman wrote:
>>
>> There is also the trick of getting a shorter directory name using
>> /proc/self/fd if you are threaded and can't change the directory.
>>
>> The obvious choices at this point are
>> - Teach bind and connect and af_unix sockets to take longer AF_UNIX
>> socket path names.
>>
>> - introduce sockaddr_fd that can be applied to AF_UNIX sockets,
>> and teach unix_bind and unix_connect how to deal with a second type of sockaddr.
>> struct sockaddr_fd { short fd_family; short pad; int fd; };
>>
>> - introduce sockaddr_unix_at that takes a directory file descriptor
>> as well as a unix path, and teach unix_bind and unix_connect to deal with a
>> second sockaddr type.
>> struct sockaddr_unix_at { short family; short pad; int dfd; char path[102]; }
>> AF_UNIX_AT
>>
>> I don't know what the implications of for breaking connect up into 3
>> system calls and changing the semantics are and I would really rather
>> not have to think about it.
>>
>> But it certainly does not look to me like you introduce new systems
>> calls to do what you want.
>>
>
> How would you distinguish the new sockaddr types from the traditional
> one? New AF_?

Yeah. AF_FD or AF_UNIX_AT is what I was thinking. The way the code
falls out that should be compartively simple to implement.

recvmsg etc would give you sockaddr_un sockets when they come from the
kernel.

Eric

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[Message index]

		[RFC PATCH 0/5] net: socket bind to file descriptor introduced By: Stanislav Kinsbursky on Wed, 15 August 2012 16:21
		[RFC PATCH 2/5] net: split unix_bind() By: Stanislav Kinsbursky on Wed, 15 August 2012 16:22
		[RFC PATCH 1/5] net: cleanup unix_bind() a little By: Stanislav Kinsbursky on Wed, 15 August 2012 16:22
		[RFC PATCH 3/5] net: new protocol operation fbind() introduced By: Stanislav Kinsbursky on Wed, 15 August 2012 16:22
		[RFC PATCH 4/5] net: fbind() for unix sockets protocol operations introduced By: Stanislav Kinsbursky on Wed, 15 August 2012 16:22
		[RFC PATCH 5/5] syscall: sys_fbind() introduced By: Stanislav Kinsbursky on Wed, 15 August 2012 16:22
		Re: [RFC PATCH 5/5] syscall: sys_fbind() introduced By: hpa on Wed, 15 August 2012 16:30
		Re: [RFC PATCH 5/5] syscall: sys_fbind() introduced By: Stanislav Kinsbursky on Wed, 15 August 2012 16:43
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: hpa on Wed, 15 August 2012 17:54
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: ebiederm on Wed, 15 August 2012 19:49
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: hpa on Wed, 15 August 2012 20:58
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: ebiederm on Wed, 15 August 2012 21:25
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: ebiederm on Thu, 16 August 2012 03:03
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: bfields on Thu, 16 August 2012 13:54
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: Stanislav Kinsbursky on Mon, 20 August 2012 10:18
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: bfields on Tue, 04 September 2012 19:00
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: bfields on Fri, 05 October 2012 20:00
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: Stanislav Kinsbursky on Mon, 08 October 2012 08:37
		Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced By: Ben Pfaff on Wed, 15 August 2012 16:52

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