Cirrus Logic CS485 Manual de usuario descargar pdf (Pagina 52)

CS485G Spring 2015 52

12. Implementation of open listenfd

1 int open_listenfd(int port) {

2 int listenfd, optval=1;

3 struct sockaddr_in serveraddr;

5 /

Create a socket descriptor

6 if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)

7 return -1;

8 // AF_INET: internet; SOCK_STREAM: reliable; 0: normal

10 /

Allow reuse of address

11 if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR,

12 (const void

)&optval , sizeof(int)) < 0)

13 return -1;

15 /

let listenfd be an endpoint for all requests

16 to port on any IP address for this host

17 bzero((char

) &serveraddr, sizeof(serveraddr));

18 serveraddr.sin_family = AF_INET;

19 serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);

20 serveraddr.sin_port = htons((unsigned short)port);

21 if (bind(

22 listenfd,

23 (SA

)&serveraddr,

24 sizeof(serveraddr)) < 0)

25 return -1;

27 /

Ready listenfd to accept connection requests

28 if (listen(listenfd, LISTENQ) < 0)

29 return -1;

30 return listenfd;

31 } // open_listenfd

54 More about ﬁles

1. Lecture 29, 4/13/2015

2. Short counts: when the amount of data read/written is not the size

of the buffer.

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Cirrus Logic CS485 Manual de usuario Pagina 52