我将如何检查我在C中工作的文件系统

Question

I'm making a program and one of the things it needs to do is transfer files. I would like to be able to check before I start moving files if the File system supports files of size X. What is the best way of going about this?

Answer 1

There's no C standard generic API for this. You could simply try creating a file and writing junk to it until it is the size you want, then deleting it, but even that isn't guaranteed to give you the info you need - for instance another process might have come and written a large file in between your test and your transfer, taking up space you were hoping to use.

Answer 2

继续使用像ftruncate类的函数在移动之前预先创建所需大小的文件，并在失败时进行适当的错误处理。