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/* Projekt: Transport
* Autor: Franciszek Malinka 316093
*/
#include "utils.h"
#include <poll.h>
#include <errno.h>
#include <stdio.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
size_t min(size_t x, size_t y) { return (x<y ? x : y); }
int get_socket() {
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
fprintf(stderr, "socket error: %s", strerror(errno));
exit(EXIT_FAILURE);
}
return sockfd;
}
long get_time_interval(struct timespec start, struct timespec finish) {
return S_TO_MS(finish.tv_sec - start.tv_sec) + NS_TO_MS(finish.tv_nsec - start.tv_nsec);
}
int poll_socket_modify_timeout(int sockfd, int *timeout) {
if (*timeout < 0) {
*timeout = 0;
return 0;
}
struct pollfd fds;
struct timespec start;
struct timespec finish;
fds.fd = sockfd;
fds.events = POLLIN;
fds.revents = 0;
clock_gettime(CLOCK_REALTIME, &start);
int result = poll(&fds, 1, *timeout);
clock_gettime(CLOCK_REALTIME, &finish);
if (result == -1) {
fprintf(stderr, "poll error: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
if (result == 0) {
*timeout = 0;
return 0;
}
*timeout -= get_time_interval(start, finish);
return result;
}
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