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查询单个进程的网络连接信息，是否有更好的方法？
从gopsutil那儿发现的这个项目
gopsutil 的做法是
- 从 /proc/{PID}/fd 提取inode
- 在 /proc/{PID}/net/(tcp| udp| unix)寻找inode
但是/proc/{PID}/net/tcp其实等同于/proc/net/tcp，也就是机器的所有tcp连接信息
如果在一些存在上万连接的机器上，每触发一个进程就需要遍历一次机器的全量连接信息，太消耗资源。
使用了你的项目确实快上不少，但是获取到的依旧是机器的全量连接
stat error
stat /proc/12906/fd: stat /proc/12906/fd: no such file or directory
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