iOS SDK 的 tcp.h 中未定义 TCP_KEEPINTVL 和 TCP_KEEPCNT
我在尝试在套接字上启用 TCP 保持活动数据包时遇到了困难。这是在 tcp.h 第 201 行中定义的：
#define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */
...但是 TCP_KEEPINTVL 和 TCP_KEEPCNT 不存在，而且我还没有找到提到它们的手册页。它们是否在其他地方定义并可能命名为其他名称？它们在 iOS 上被禁用了吗？
I've hit a brick wall trying to enable tcp keep alive packets on a socket. This is defined in tcp.h line 201:
#define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */
...but the TCP_KEEPINTVL and TCP_KEEPCNT aren't there, and I haven't found a man page yet that mentions them. Are these defined somewhere else and possibly named something else? Are they disabled for iOS?
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它们肯定是在 iOS 7 和 OS X 10.9（可能更早）中定义的。
然而，我在苹果开发论坛上发现了一篇帖子，表明它实际上并未实现。
They are certainly defined in iOS 7 and OS X 10.9 (and probably earlier).
However, I've found a post on the Apple dev forums which suggests that it's not actually implemented.