> It's always bugged me that AF_UNIX addresses have a relatively short length limit. If you look at the actual kernel ABI, you'll see that the sun_addr structur

> It's always bugged me that AF_UNIX addresses have a relatively short length limit. If you look at the actual kernel ABI, you'll see that the sun_addr structure can be made as long as necessary. The kernel could support long unix socket addresses without new APIs. There is no limit except the typical file path limit. The kernel does support longer paths. It will obey the third, socklen_t, parameter to both connect(2) and bind(2). The size of .sun_path from the kernel's perspective extends to the end of the sockaddr structure declared by the socklen_t parameter. This applies not only to Linux but all Unix-like systems except, IIRC, Minix. The flip side is that you have to check the return values of accept(2), getsockname(2), and getpeername(2) for truncation. The full path of the socket may not fit in the size of the structure you pass.