通常程序执行 IO 操作时,需要涉及用户空间和内核空间的两个缓冲区。 Only the kernel can operate with hardware such as disks; therefore, when data flows to the program, it must first r[......] 继续阅读
通常程序执行 IO 操作时,需要涉及用户空间和内核空间的两个缓冲区。 Only the kernel can operate with hardware such as disks; therefore, when data flows to the program, it must first r[......] 继续阅读