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Protocol between a client - using skabus_rpc_*() - and skabus-rpcd.
Registering (1st connection) (client -> server)
'S' : 1
pmid : 4
idlen : 1
relen : 4
idstr : idlen
'\0' : 1
re : relen
'\0' : 1
Sending a query (qclient -> server)
'Q' : 1
deadline : TAIN_PACK (12)
contains sec(8), nano(4)
iflen : 1
ifname : iflen
'\0' : 1
msg : msglen
A PM is the same as a query, except the ifname starts with a 0xff char
and contains an idstr instead of an ifname.
Sending a query (server -> rclient)
'Q' : 1
ifid : 4
rinfo: SKABUS_RPC_RINFO_PACK
contains serial(8), deadline(12), timestamp(12), uid(sizeof(uid_t)), gid(sizeof(gid_t)), idstr(SKABUS_RPC_IDSTR_SIZE), '\0'(1)
msg : msglen
Sending a reply (rclient -> server)
'R' : 1
serial : 8
result : 1
msg : msglen
Sending a reply (server -> qclient)
'R' : 1
serial : 8
status : 1. If not '\0', the rest is ignored.
result : 1
msg : msglen
Cancelling a query (qclient -> server)
'C' : 1
serial : 8
Cancelling a query (server -> rclient)
'C' : 1
ifid : 4
serial : 8
reason : 1
Registering an interface (client -> server)
'I' : 1
ifid : 4
iflen : 1
relen : 4
ifname : iflen
'\0' : 1
re : relen
'\0' : 1
Unregistering an interface (client -> server)
'i' : 1
iflen : 1
ifname : iflen
'\0' : 1
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