摘要：
1. https://answers.ros.org/question/189867/what-is-the-timestamp/ In ROS messages timestamp is taken from your system, which is unix epoch time. Check 阅读全文
摘要：
https://blog.csdn.net/aganlengzi/article/details/21888351 article 1 在一些系统调用中需要指定时间是用CLOCK_MONOTONIC还是CLOCK_REALTIME，以前总是搞不太清楚它们之间的差别，现在终于有所理解了。 CLOCK_ 阅读全文