sockopt KEEPALIVE
时间：2010-07-18 来源：ubuntuer
# include <netinet/tcp.h>
int keepalive; // 打开TCP KEEPALIVE开关
int keepidle; // 系统等待多长时间开始检测
int keepintvl; // 系统每次探测时间
int keepcnt; // 系统探测几次后执行关闭操作。
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char*)&keepalive, sizeof(keepalive))；
isetsockopt(fd, SOL_TCP, TCP_KEEPIDLE, (char *)&keepidle, sizeof(keepidle))；
setsockopt(fd, SOL_TCP, TCP_KEEPINTVL,(char *)&keepintvl, sizeof(keepintvl))；
setsockopt(fd, SOL_TCP, TCP_KEEPCNT,(char *)&keepcnt, sizeof(keepcnt))；
int keepalive; // 打开TCP KEEPALIVE开关
int keepidle; // 系统等待多长时间开始检测
int keepintvl; // 系统每次探测时间
int keepcnt; // 系统探测几次后执行关闭操作。
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char*)&keepalive, sizeof(keepalive))；
isetsockopt(fd, SOL_TCP, TCP_KEEPIDLE, (char *)&keepidle, sizeof(keepidle))；
setsockopt(fd, SOL_TCP, TCP_KEEPINTVL,(char *)&keepintvl, sizeof(keepintvl))；
setsockopt(fd, SOL_TCP, TCP_KEEPCNT,(char *)&keepcnt, sizeof(keepcnt))；
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