UDP client

#include
#include
#include
#include
#include
#include
void error(char *);
int main(int argc, char *argv[])
{
int sock, length, n;
struct sockaddr_in server, from;
struct hostent *hp;
char buffer[256];
if (argc != 3) { printf("Usage: server port\n");
exit(1);
}
sock= socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) error("socket");
server.sin_family = AF_INET;
hp = gethostbyname(argv[1]);
if (hp==0) error("Unknown host");
bcopy((char *)hp->h_addr,(char *)&server.sin_addr,hp->h_length);
server.sin_port = htons(atoi(argv[2]));
length=sizeof(struct sockaddr_in);
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n=sendto(sock,buffer,strlen(buffer),0,&server,length);
if (n < 0) error("Sendto");
n = recvfrom(sock,buffer,256,0,&from, &length);
if (n < 0) error("recvfrom");
write(1,"Got an ack: ",12);
write(1,buffer,n);
}
void error(char *msg)
{
perror(msg);
exit(0);
}

Udp Server

/* Creates a datagram server. The port
number is passed as an argument. This
server runs forever */
#include
#include
#include
#include
#include
void error(char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sock, length, fromlen, n;
struct sockaddr_in server;
struct sockaddr_in from;
char buf[1024];
if (argc < 2) {
fprintf(stderr, "ERROR, no port provided\n");
exit(0);
}
sock=socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) error("Opening socket");
length = sizeof(server);
bzero(&server,length);
server.sin_family=AF_INET;
server.sin_addr.s_addr=INADDR_ANY;
server.sin_port=htons(atoi(argv[1]));
if (bind(sock,(struct sockaddr *)&server,length)<0)
error("binding");
fromlen = sizeof(from);
while (1) {
n = recvfrom(sock,buf,1024,0,(struct sockaddr *)&from,&fromlen);
if (n < 0) error("recvfrom");
write(1,"Received a datagram: ",21);
write(1,buf,n);
n = sendto(sock,"Got your message\n",17,0,(struct sockaddr *)&from,fromlen);
if (n < 0) error("sendto");
}
}

Reservation

reservations are dividing india into castes and will result in hatred among people when deserving candidates will remain jobless and these will rule over them