- 36-
/* end of line but still some data in buffer => return line */
if(rcv_ptr <n-1) {
/* set last byte to END_LINE */
*(line_to_return+offset)=END_LINE;
rcv_ptr++;
return ++offset;
}
/* end of buffer but line is not ended => */
/* wait for more data to arrive on socket */
if(rcv_ptr == n) {
rcv_ptr = 0;
}
} /* while */
}/*main*/
9.2. Lập trình client /server theo giao thức UDP/IP
• Chương trình udpClient.c
/* udpClient.c */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
/* memset() */
#include <sys/time.h>
/* select() */
#define REMOTE_SERVER_PORT 1500
#define MAX_MSG 100
int main(int argc, char *argv[]) {
int sd, rc, i;
struct sockaddr_in cliAddr, remoteServAddr;
struct hostent *h;
/* check command line args */
if(argc<3) {
printf("usage : %s <server> <data1> ... <dataN> \n", argv[0]);
exit(1);
}
/* get server IP address (no check if input is IP address or DNS name */
h = gethostbyname(argv[1]);
if(h==NULL) {
printf("%s: unknown host '%s' \n", argv[0], argv[1]);
exit(1);
}
