当文件仍在 OS / 磁盘驱动程序缓存中时是否可以重命名文件？

Question

例如，我将一个大缓冲区写入一个临时文件，然后立即重命名该文件。会发生什么？

const char* tmp_file = "test.bin.tmp";
const char* real_file = "test.bin";

FILE* fp = fopen(tmp_file, "w+b");
if(fp)
{
    fwrite(large_buffer, sizeof(large_buffer), 1, fp);
    fclose(fp);

    // Here, assume that the data is still in the OS's / Disk driver's cache
    rename(tmp_file, real_file);
}

Answer 1

OS会刷新缓存，然后正常执行重命名操作。