poll() method not working in Linux but working in Mac - c++

Question

I am using C++ code snippet for port forwarding. The requirement is to do the hand shake between two ports. It should be two way communication. That is to forward what ever iscoming on the source port to destination port. And then to forward the response of the destination port to the source port.
This piece of code is working as expected on my mac system. But when I am running this code on Linux system I am facing one issue.
Issue:
The C++ code that I am using is having 3 parts:
establish_connection_to_source();
open_connection_to_destination();
processconnetion();
On Linux: establish_connection_to_source(); and open_connection_to_destination(); is working perfectly fine. But processconnetion(); is havng one issue.
Following is the process connection method:
void processconnetion()
{
buffer *todest = new buffer(socket_list[e_source].fd,socket_list[e_dest].fd);
buffer *tosrc = new buffer(socket_list[e_dest].fd,socket_list[e_source].fd);
if (todest == NULL || tosrc == NULL){
fprintf(stderr,"out of mememory\n");
exit(-1);
}
unsigned int loopcnt;
profilecommuncation srcprofile(COMM_BUFSIZE);
profilecommuncation destprofile(COMM_BUFSIZE);
while (true) {
int withevent = poll(socket_list, 2, -1);
loopcnt++;
fprintf(stderr,"loopcnt %d socketswith events = %d source:0x%x dest:0x%x\n", loopcnt, withevent, socket_list[e_source].revents, socket_list[e_dest].revents);
if ((socket_list[e_source].revents | socket_list[e_dest].revents) & (POLLHUP | POLLERR)) {
// one of the connections has a problem or has Hungup
fprintf(stderr,"socket_list[e_source].revents= 0x%X\n", socket_list[e_source].revents);
fprintf(stderr,"socket_list[e_dest].revents= 0x%X\n", socket_list[e_dest].revents);
fprintf(stderr,"POLLHUP= 0x%X\n", POLLHUP);
fprintf(stderr,"POLLERR= 0x%X\n", POLLERR);
int result;
socklen_t result_len = sizeof(result);
getsockopt(socket_list[e_dest].fd, SOL_SOCKET, SO_ERROR, &result, &result_len);
fprintf(stderr, "result = %d\n", result);
fprintf(stderr,"exiting as one connection had an issue\n");
break;
}
if (socket_list[e_source].revents & POLLIN) {
srcprofile.increment_size(todest->copydata());
}
if (socket_list[e_dest].revents & POLLIN) {
destprofile.increment_size(tosrc->copydata());
}
}
delete todest;
delete tosrc;
close(socket_list[e_source].fd);
close(socket_list[e_dest].fd);
srcprofile.dumpseensizes("source");
destprofile.dumpseensizes("destination");
}
Here it is giving error - exiting as one connection had an issue that means that if ((socket_list[e_source].revents | socket_list[e_dest].revents) & (POLLHUP | POLLERR)) is returning true. The issue is with the destination port and not in case of source.
Note:
Variales used in the processconnetion(); method:
socket_list is a structure of type pollfd. Following is the description:
struct pollfd {
int fd;
short events;
short revents;
};
pollfd socket_list[3];
#define e_source 0
#define e_dest 1
#define e_listen 2
Following is the output at the time for exit:
connecting to destination: destination IP / 32001.
connected...
loopcnt 1 socketswith events = 1 source:0x0 dest:0x10
socket_list[e_source].revents= 0x0
socket_list[e_dest].revents= 0x10
POLLHUP= 0x10
POLLERR= 0x8
result = 0
exiting as one connection had an issue
int withevent = poll(socket_list, 2, -1); here the withevent value returned is 1
Socket List Initialisation:
guard( (socket_list[e_listen].fd = socket( PF_INET, SOCK_STREAM, IPPROTO_TCP )), "Failed to create socket listen, error: %s\n", "created listen socket");
void guard(int n, char *msg, char *success)
{
if (n < 0) {
fprintf(stderr, msg, strerror(errno) );
exit(-1);
}
fprintf(stderr,"n = %d %s\n",n, success);
}
I am not able to figure out the issue as it is working fine in mac. Any leads why this behaviour in Linux is highly appreciated. Thanks in advance.