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#include <sys/types.h>
#include <sys/socket.h>
#include "protocol.h"
#define TCP_TIMEOUT 100000 // 100ms in microseconds
#define MAX_PACKET_SIZE 512
int send_all(int sock, char *buf, int *len)
{
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = TCP_TIMEOUT;
// if (setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, &timeout,
// sizeof timeout) < 0)
// perror("setsockopt failed\n");
int total = 0; // how many bytes we've sent
int bytesleft = *len; // how many we have left to send
int n;
// ensure we don't send more than MAX_PACKET_SIZE bytes
size_t max_send = bytesleft >= MAX_PACKET_SIZE ? MAX_PACKET_SIZE : bytesleft;
while(total < *len) {
n = send(sock, buf+total, max_send, 0);
if (n == -1) { break; }
total += n;
bytesleft -= n;
}
*len = total; // return number actually sent here
return n==-1?-1:0; // return -1 on failure, 0 on success
}
int recv_all(int sock, char *buf, int *len)
{
// setup the timeout on the socket
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = TCP_TIMEOUT;
if (setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, &timeout,
sizeof timeout) < 0)
perror("setsockopt failed\n");
// printf("start: %ld\n", start);
int total = 0; // how many bytes we've sent
int bytesleft = *len; // how many we have left to send
int n;
while(total < *len) {
n = recv(sock, buf+total, bytesleft, 0);
// start = time(NULL);
if (n == -1) { break; }
total += n;
bytesleft -= n;
}
timeout.tv_sec = 0;
timeout.tv_usec = 0;
if (setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, &timeout,
sizeof timeout) < 0)
perror("setsockopt failed\n");
*len = total; // return number actually sent here
return n==-1?-1:0; // return -1 on failure, 0 on success
}
int apply_timeout(int fd) {
// handle handshake
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = TCP_TIMEOUT;
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
perror("setsockopt (in apply_timeout)");
return -1;
}
return 1;
}
int remove_timeout(int fd)
{
// handle handshake
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
perror("setsockopt (in remove_timeout)");
return -1;
}
return 1;
}
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