Developing network-based applications

Sockets

Sockets is an API that provides a framework for communication between processes executing either on the same host or across a network. A socket is the basic building block for communication, providing an endpoint to which a name may be bound. Sockets are created within a communications domain (Internet or UNIX) in the same way that files are created within a filesystem. Sockets are bidirectional, providing a two-way flow of data between processes that may or may not have the same parent and may or may not live on the same host.

The SCO OpenServer sockets library is a 4.3BSD-compatible socket library that can be used to access the protocols provided with SCO TCP/IP: TCP, UDP, and IP. Both the AF_INET and AF_UNIX socket families are supported.

Socket library routines (SLIB)

Routine Description

bstring byte and byte string operations

byteorder convert values between host and network byte order

getdtablesize get descriptor table size

gethostbyname get network host entry

gethostname get/set name of current host

getnetent get network entry

getprotoent get protocol entry

getservent get service entry

gettimeofday get date and time

inet Internet address manipulation routines

insque insert/remove element from a queue

killpg send signal to a process group

perror system error messages

rcmd routines to return a stream to a remote command

resolver resolver routines

rexec return stream to a remote command

string 4.3 BSD string operations

syslog control system log

wait3 wait for process to terminate or stop

Socket system calls (SSC)

System call Description

accept accept a connection on a socket

adjtime correct the time to allow for synchronization of the system clock

bind bind a name to a socket

connect initiate a connection on a socket

getpeername get name of connected peer

getsockname get socket name

getsockopt get and set options on sockets

listen listen for connections on a socket

recv receive a message from a socket

select synchronous I/O multiplexing

send send a message to a socket

shutdown shut down part of a full-duplex connection

socket create an endpoint for communication

Routine	Description
bstring	byte and byte string operations
byteorder	convert values between host and network byte order
getdtablesize	get descriptor table size
gethostbyname	get network host entry
gethostname	get/set name of current host
getnetent	get network entry
getprotoent	get protocol entry
getservent	get service entry
gettimeofday	get date and time
inet	Internet address manipulation routines
insque	insert/remove element from a queue
killpg	send signal to a process group
perror	system error messages
rcmd	routines to return a stream to a remote command
resolver	resolver routines
rexec	return stream to a remote command
string	4.3 BSD string operations
syslog	control system log
wait3	wait for process to terminate or stop

System call	Description
accept	accept a connection on a socket
adjtime	correct the time to allow for synchronization of the system clock
bind	bind a name to a socket
connect	initiate a connection on a socket
getpeername	get name of connected peer
getsockname	get socket name
getsockopt	get and set options on sockets
listen	listen for connections on a socket
recv	receive a message from a socket
select	synchronous I/O multiplexing
send	send a message to a socket
shutdown	shut down part of a full-duplex connection
socket	create an endpoint for communication