INTRODUCTION   4 

     The Big Picture   4 
     Unix Process Control   6 
     Client-Server Model   9 
     Connections and Associations   11 
     Byte Order   13 
     Port Numbers   15 
     Concurrent Servers   16 

ELEMENTARY TCP SOCKETS   20 

     TCP Socket Functions   20 
     Socket Addresses   22 
     Value-Result Arguments   25 
     socket Function   26 
     bind Function   28 
     connect Function   30 
     TCP Daytime Client   32 
     listen Function   35 
     accept Function   37 
     getsockname and getpeername Functions   41 
     Byte Ordering Routines   42 
     Internet Address Conversion Routines   43 

TCP CLIENT-SERVER EXAMPLE   44 

     An Echo Server   44 
     Utility Routines   45 
     TCP Server   48 
     TCP Client   51 
     TCP Example Summary   53 

ELEMENTARY UDP SOCKETS   66 

     UDP Socket Functions   66 
     connect Function (UDP)   67 
     send, sendto, recv, and recvfrom Functions   71 

UDP CLIENT-SERVER EXAMPLE   75 

     UDP Server   75 
     UDP Client   77 
     UDP Example Summary   79 

ADVANCED SOCKETS   85 

     close Function   85 
     shutdown Function   88 
     setsockopt and getsockopt Functions   90 
     Unix Domain Protocols   94 
     I/O Multiplexing: select Function   95 
     Constructing Internet Addresses   99 
        getaddrinfo Function   101 
        getnameinfo Function   103 
     Preforked Servers   106 
     Threaded Servers   109 
     I/O Timeouts   111 
     Broadcasting   114