The functions of the following Release 6.0.0
networking libraries may safely be called from any thread of a program with
multiple threads of execution (that is, any program linked with
the Threads Library):
Networking Services Library (libnsl.so),
which supports
challenge-response authentication
Connection Server interface
name-to-address mapping
network selection
Network Information Service® (NIS)
remote execution
remote procedure calls (RPC)
the
X/Open
Transport Interface (XTI)
sockets library (libsocket.so)
resolver library (for Domain Name Service) (libresolv.so)
name-to-address mapping transport-specific libraries for
Domain Name Service (resolv.so)
loopback and other transports that use character-string addresses (straddr.so)
hosts and services files-based addressing (tcpip.so)