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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/select.h>
#define BUFFER_SIZE 1024
typedef struct number_val {
int val;
struct timeval tv;
} num;
int sock_init(argv)
char **argv;
{
struct sockaddr_in address, serv_addr;
int sock = 0, valread;
char buffer[1024] = {0};
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Socket creation error\n");
return -1;
}
memset(&serv_addr, '0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(atoi(argv[2]));
if (inet_pton(AF_INET, argv[1], &serv_addr.sin_addr) <= 0) {
perror("Invalid address/Address not supported\n");
return -1;
}
if (connect(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
perror("Connection Failed");
return -1;
}
return sock;
}
int main(argc, argv)
int argc;
char **argv;
{
int sock = 0, valread, start_ptr = -1, end_ptr = 0, qset, i;
double avg = 0, cnt;
char buffer[1024] = {0};
num num_buffer[BUFFER_SIZE];
fd_set rs, ws, es;
struct timeval now, *ww, tmp;
sock = sock_init(argv);
while (1) {
FD_ZERO(&rs); FD_ZERO(&ws); FD_ZERO(&es);
FD_SET(sock, &rs);
qset = select(sock + 1, &rs, (fd_set *) 0, (fd_set *) 0, ww);
gettimeofday(&now, NULL);
now.tv_sec = now.tv_sec - 60;
ww = &tmp;
tmp.tv_sec = 0;
tmp.tv_usec = 500000;
if (FD_ISSET(sock, &rs)) {
valread = read(sock, buffer, 1024);
for (i = 0; i < valread; i+=2) {
if (end_ptr == BUFFER_SIZE)
end_ptr = 0;
if (end_ptr != start_ptr) {
gettimeofday(&(num_buffer[end_ptr].tv), NULL);
num_buffer[end_ptr].val = atoi(buffer);
end_ptr++;
} else {
printf("dropping number...\n");
}
}
}
if (start_ptr == -1)
start_ptr = 0;
if (start_ptr < end_ptr) {
for (i = start_ptr; i < end_ptr; i++) {
if (num_buffer[i].tv.tv_sec <= now.tv_sec)
start_ptr = i + 1;
}
} else {
for (i = start_ptr; i < BUFFER_SIZE; i++) {
if (num_buffer[i].tv.tv_sec <= now.tv_sec)
start_ptr = i + 1;
}
for (i = 0; i < end_ptr; i++) {
if (num_buffer[i].tv.tv_sec <= now.tv_sec)
start_ptr = i + 1;
}
start_ptr %= BUFFER_SIZE;
}
avg = 0;
cnt = start_ptr > end_ptr ? (BUFFER_SIZE - start_ptr + end_ptr) : (end_ptr - start_ptr);
cnt = cnt == 0 ? 10 : cnt;
if (start_ptr < end_ptr) {
for (i = start_ptr; i < end_ptr; i++)
avg += num_buffer[i].val / cnt;
} else {
for (i = start_ptr; i < BUFFER_SIZE; i++)
avg += num_buffer[i].val / cnt;
for (i = 0; i < end_ptr; i++)
avg += num_buffer[i].val /cnt;
}
printf("avg: %10.5f\n", avg);
}
}
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