完全实现linux下SOCKET连接断开判断

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/* Net check Make sure you have not used OUT OF BAND DATA AND YOU CAN use OOB */
int netcheck(int fd)
{
int buf_size = 1024;
char buf[buf_size];
//clear OOB DATA
recv(fd, buf, buf_size);
if(send(fd, (void *)"\0", 1, MSG_OOB) < 0 )
{
fprintf(stderr, "Connection[%d] send OOB failed, %s", fd, strerror(errno));
return -1;
}
return 0;
}

复制代码

/* Setting SO_TCP KEEPALIVE */
//int keep_alive = 1;//设定KeepAlive
//int keep_idle = 1;//开始首次KeepAlive探测前的TCP空闭时间
//int keep_interval = 1;//两次KeepAlive探测间的时间间隔
//int keep_count = 3;//判定断开前的KeepAlive探测次数
void set_keepalive(int fd, int keep_alive, int keep_idle, int keep_interval, int keep_count)
{
int opt = 1;
if(keep_alive)
{
if(setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
(void*)&keep_alive, sizeof(keep_alive)) == -1)
{
fprintf(stderr,
"setsockopt SOL_SOCKET::SO_KEEPALIVE failed, %s\n",strerror(errno));
}
if(setsockopt(fd, SOL_TCP, TCP_KEEPIDLE,
(void *)&keep_idle,sizeof(keep_idle)) == -1)
{
fprintf(stderr,
"setsockopt SOL_TCP::TCP_KEEPIDLE failed, %s\n", strerror(errno));
}
if(setsockopt(fd,SOL_TCP,TCP_KEEPINTVL,
(void *)&keep_interval, sizeof(keep_interval)) == -1)
{
fprintf(stderr,
"setsockopt SOL_tcp::TCP_KEEPINTVL failed, %s\n", strerror(errno));
}
if(setsockopt(fd,SOL_TCP,TCP_KEEPCNT,
(void *)&keep_count,sizeof(keep_count)) == -1)
{
fprintf(stderr,
"setsockopt SOL_TCP::TCP_KEEPCNT failed, %s\n", strerror(errno));
}
}
}