在到达指定的日期/时间时，是否可以在Linux的C/C ++中得到通知? [英] Is it possible in C/C++ in Linux to get informed when a specified date/time is reached?

问题描述

在Linux上使用标准C ++是否有可能在系统时间到达指定的日期/时间时得到通知(假设我的过程已经完成)?

Is it possible using standard C++ in Linux to get informed when a specified date/time is reached by the system time (assuming my process is up of course)?

我可以将计时器设置为需要等待的时间，但是如果用户更改系统时间会怎样?系统能否通知我用户更改了系统时间来重置我的计时器?

I could just set a timer to the time I need to wait, but what happens if the user changes the system time? Can I get informed by the system that the user changed the system time to reset my timers?

推荐答案

Linux内核具有此类系统调用，尽管它们未集成到libc API中.您可以创建一个计时器，从内核获取它的文件描述符，然后对描述符进行选择或epoll调用，以在计时器触发时得到通知.

The Linux kernel has such system calls, although, they are not integrated into the libc API. You can create a timer, get a file descriptor for it from the kernel, and do a select or epoll call on the descriptor to be notified when the timer fires.

手册页: http://www.kernel.org/doc/man-pages/online/pages/man2/timerfd_create.2.html

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