SO_KEEPALIVE

tcpKeepAlive.c

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
 
int enableKeepAlive = 1;
int fd = tcpSocket->socketDescriptor();
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &enableKeepAlive, sizeof(enableKeepAlive));
 
int maxIdle = 300;
setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &maxIdle, sizeof(maxIdle));
 
int count = 4;
setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &count, sizeof(count));
 
int interval = 4;
setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &interval, sizeof(interval));