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Transport Layer Interface
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networking, programming (TLI, or "Transport Level
Interface") A protocol-independent interface for accessing
network facilities, modelled after the ISO transport layer
(level 4), that first appeared in Unix SVR3.
TLI is defined by SVID as transport mechanism for networking
interfaces, in preference to sockets, which are biased
toward IP and friends. A disavantage is that a process
cannot use read/write directly, but has to use backends using
stdin and stdout to communicate with the network
connection. TLI is implemented in SVR4 using the STREAMS
interface. It adds no new system calls, just a library,
libnsl_s.a. The major functions are t_open, t_bind,
t_connect, t_listen, t_accept, t_snd, t_rcv, read, write.