问题
if (!wheel) { wheel = new Wheel(); } // or some such
My google goggles aren't working too well today. I figured this one must have been coded a gazillion times already and was looking for some FOSS code, but couldn't find any.
Before I reinvent the spherical axle-surrounding device, can anyone point me at a URL?
I am coding in C for an embedded system (Atmel UC3), but that shouldn't make any difference, just explain why I need a cyclical logfile (because of limited storage).
I want to log events to a file on an SD card and when the reaches a certain size I want to start writing again at the start. Any URLs for that? (fixed entry size is ok; otherwise it might get nasty on wraparound).
Thanks a 1,000,000 in advance!
回答1:
Sourceforge has a project called Cyclic Logs which may be what you need.
If not, it's not the hardest thing to implement. Just treat it like a normal cyclic memory space. But instead of having it be resident in memory have it reside on the disk.
( maintain a pointer to the head of the log and the end of the log ( increment as needed ))
Store those as headers to the log or as another flat file.
来源：https://stackoverflow.com/questions/9075532/open-source-solutions-for-creating-a-cyclical-logfile