"H. Peter Anvin" <h...@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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