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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)?
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?
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.
The man page for it: http://www.kernel.org/doc/man-pages/online/pages/man2/timerfd_create.2.html