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Date: Wed, 15 Aug 2012 13:58:36 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: "Eric W. Biederman" <ebiederm@...ssion.com> CC: Stanislav Kinsbursky <skinsbursky@...allels.com>, tglx@...utronix.de, mingo@...hat.com, davem@...emloft.net, thierry.reding@...onic-design.de, bfields@...hat.com, eric.dumazet@...il.com, xemul@...allels.com, neilb@...e.de, netdev@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org, paul.gortmaker@...driver.com, viro@...iv.linux.org.uk, gorcunov@...nvz.org, akpm@...ux-foundation.org, tim.c.chen@...ux.intel.com, devel@...nvz.org Subject: Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced 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_? -hpa -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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