Cirrus Logic CS485 Manual de usuario descargar pdf (Pagina 50)

CS485G Spring 2015 50

10. Implementation of open clientfd

1 int open_clientfd(char

hostname, int port) {

2 int toserverfd;

3 struct hostent

serverHostEntry;

4 struct sockaddr_in serveraddr;

5 if ((toserverfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)

6 return -1; /

check errno

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

8 /

Fill in the server’s IP address and port

9 if ((serverHostEntry = gethostbyname(hostname)) == NULL)

10 return -2; /

check h_errno for cause of error

11 bzero((char

) &serveraddr, sizeof(serveraddr));

12 serveraddr.sin_family = AF_INET;

13 bcopy((char

)serverHostEntry->h_addr_list[0],

14 (char

)&serveraddr.sin_addr.s_addr, serverHostEntry->h_length);

15 serveraddr.sin_port = htons(port);

17 /

Establish a connection with the server

18 if (connect(toserverfd, (SA

) &serveraddr, sizeof(serveraddr)) < 0)

19 return -1;

20 return toserverfd;

21 } // open_clientfd

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Cirrus Logic CS485 Manual de usuario Pagina 50