Cirrus Logic CS485 Bedienungsanleitung PDF herunterladen (Seite 48)

CS485G Spring 2015 48

(b) connect() to attach the socket to the server (like “call a num-

ber”).

5. Server

(a) socket() to create a local ﬁle descriptor (“buy a phone”).

(b) bind() to bind a name to the socket (“get a phone number”).

(d) accept() to create a ﬁle descriptor for this connection (“an-

swer the phone”)

6. The book provides some nicer routines that handle errors and com-

bine operations.

(a) Client: open clientfd() (combines socket() and connect())

(b) Server: open listenfd() (combines socket(), bind(), and

listen()), then accept()

7. Generic socket address structure (used for connect(), bind(), and

accept()

1 struct sockaddr {

2 unsigned short sa_family; /

protocol

3 char sa_data[14]; /

address data

4 };

8. Speciﬁc socket address structure for the internet

1 struct sockaddr_in {

2 unsigned short sin_family; /

AF_INET

3 unsigned short sin_port; /

net order

4 struct in_addr sin_addr; /

net order

5 unsigned char sin_zero[8]; /

pad

6 };

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Cirrus Logic CS485 Bedienungsanleitung Seite 48