/etc/services
result = setservent (stayopen)
int result, stayopen;
result 0
-1
stayopen /etc/services
getservbyname()
getservbyport() getservent()
/etc/services
getservbyname() getservbyport()
getservent() getservent()
/etc/services
select()
fd_set types.h
SOCKET.PASI SOCKET.FTNI
FD_CLR (socket, bitmask)
int socket;
fd_set *bitmask;
socket
bitmask fd_set