AIX中setsockopt设置参数失败

aix上的应用程序作为客户端，设置网络参数以控制心跳包的属性，以下代码从linux移植过来，即在setsockopt中把SOL_TCP改成了IPPROTO_TCP，但在运行后，出现设置失败现象，错误码是： No such file or directory（通过strerror(errno)获取），跪求专家们帮忙分析，谢谢！
int keep_alive = 1;

int keep_idle = 1;

int keep_interval = 1;

int keep_count = 3;

if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void*) &keep_alive,

sizeof(keep_alive)) == -1)

{

trace_log(ERR, "setsockopt SOL_SOCKET::SO_KEEPALIVE failed, %s. ",

strerror(errno));

}

if (setsockopt(s, 'IPPROTO_TCP'/*SOL_TCP*/, TCP_KEEPIDLE, (void *) &keep_idle,

sizeof(keep_idle)) == -1)

{

trace_log(ERR, "setsockopt SOL_TCP::TCP_KEEPIDLE failed, %s. ",

strerror(errno));

}