Pocket Guide to TCP/IP Socket Programming in C

I Tutorial

1 Introduction
1.1 Networks, Packets and Protocols
1.2 About Addresses
1.3 Clients and Servers
1.4 What is a Socket?



2 Basic Sockets
2.1 Creating and Destroying
2.2 Specifying Addresses
2.3 TCP Client
2.4 TCP Server



3 Constructing Messages
3.1 Encoding Data
3.2 Byte Ordering
3.3 Alignment and Padding
3.4 Framing and Parsing



4 Using UDP Sockets
4.1 UDP Client
4.2 UDP Server
4.3 Sending and Receiving with UDP Sockets



5 Socket Programming
5.1 Socket Options
5.2 Signals

5.3 Nonblocking I/O
5.3.1 Nonblocking Sockets
5.3.2 Asynchronous I/O
5.3.3 Timeouts


5.4 Multitasking
5.4.1 Per-client Processes
5.4.2 Per-client Thread
5.4.3 Constrained-Multitasking

5.5 Multiplexing

5.6 Multiple Recipients
5.6.1 Broadcast
5.6.2 Multicast
5.6.3 Broadcast vs. Multicast



6 Under The Hood
6.1 Buffering and TCP
6.2 Deadlock
6.3 Performance Implications


6.4 TCP Socket Life Cycle
6.4.1 Connecting
6.4.2 Closing A TCP Connection

6.5 Demultiplexing Demystified


7 Domain Name Service
7.1 Mapping Between Names and Internet addresses
7.2 Finding Service Information by Name

II API Reference

Data Structures
sockaddr
sockaddr_in


Socket Setup
socket()
bind()
getsockname()


Socket Connection
connect()
listen()
accept()
getpeername()


Socket Communication
send()
sendto()
recv()
recvfrom()
close()
shutdown()


Socket Control
getsockopt()
setsockopt()


Binary/String Conversion
inet_ntoa()
inet_addr()
htons(), htonl(), ntohs(), ntohl()


Host and Service Information
gethostname()
gethostbyname()
gethostbyaddr()
getservbyname()
getservbyport()