clients not using X abstract socket (Linux)?
cloos at jhcloos.com
Thu Sep 11 12:57:11 PDT 2008
>>>>> "Eirik" == Eirik Byrkjeflot Anonsen <eirik at opera.com> writes:
>> The size passed to connect() should be the same as that passed to
>> bind() by the server, which would be 'strlen(file) + 1 +
>> offsetof(struct sockaddr_un, sun_path)', and not sizeof(addr), for
>> some reason. See TRANS(SocketUNIXCreateListener) in Xtranssock.c.
Eirik> Could that be related to this quote from "man unix": "Note that
Eirik> names in the abstract namespace are not zero-terminated."
Yes, taht is exactly the issue. The abstract sockets use Pascal-style
strings (lenght+data) rather than C-style (NULL-terminated), but with
the complication that the lenght is the used lenght of the whole struct
rather than just of the string. Hense the need for offsetof¹.
1] If you know the strlen(3) of the name you could create a struct of
just the right size, but that would require open-coding the struct
rather than using the definition in the system include file.
James Cloos <cloos at jhcloos.com> OpenPGP: 1024D/ED7DAEA6
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