guodongxiaren commented on issue #1895:
URL:
https://github.com/apache/incubator-brpc/issues/1895#issuecomment-1221225264
可以通过给客户端socket设置SO_KEEPALIVE参数来实现。开启keepalive操作系统会来探活然后关闭已经断开的socket。
```cpp
if (setsockopt(client_fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val))
== -1) {
...
}
```
对代码侵入性比较小。另外可以把把TCP_KEEPIDLE、TCP_KEEPINTVL、TCP_KEEPCNT三个socket选项的值提供给Channel设置。
让用户自定义探活动时间
```cpp
if (setsockopt(client_fd, IPPROTO_TCP, TCP_KEEPIDLE, &val1, sizeof(val))
< 0) {
...
}
if (setsockopt(cliend_fd, IPPROTO_TCP, TCP_KEEPINTVL, &val2,
sizeof(val)) < 0) {
...
}
if (setsockopt(, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof(val3)) < 0) {
...
}
```
不设置的时候会走系统中对应的配置：
```bash
cat /proc/sys/net/ipv4/tcp_keepalive_time
7200
cat /proc/sys/net/ipv4/tcp_keepalive_intvl
75
cat /proc/sys/net/ipv4/tcp_keepalive_probes
9
```
2个小时以后会被操作系统关闭。
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