net: implement a SO_DOMAIN getsockoption
This sockopt goes in line with SO_TYPE and SO_PROTOCOL. It makes it possible for userspace programs to pass around file descriptors — I am referring to arguments-to-functions, but it may even work for the fd passing over UNIX sockets — without needing to also pass the auxiliary information (PF_INET6/IPPROTO_TCP). Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller
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@ -30,6 +30,7 @@
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#define SO_ERROR 0x1007
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#define SO_TYPE 0x1008
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#define SO_PROTOCOL 0x1028
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#define SO_DOMAIN 0x1029
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/* Linux specific, keep the same. */
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