In some cases, you can also map a file descriptor to a plain file or another device into memory.
在某些情况下，还可以把一般文件或另一个设备的文件描述符映射到内存。
This system call requires the file descriptor from shm_open and returns a pointer to memory.
这个系统调用需要shm_open返回的文件描述符，它返回指向内存的指针。
shm_unlink(): Deletes a shared memory region given a file descriptor (returned from shm_open()).
shm_unlink()：根据（shm_open()返回的）文件描述符，删除共享内存段。
A reference was made to a segment not present in memory (one in which the Segment-Present flag of the segment Descriptor was cleared).
引用一个不在内存中的段(段描述符的段存在标志为空)。
In order to update a segment register, the corresponding segment descriptor must be modified in kernel memory and then reloaded into the segment register.
更新段寄存器时，与其相应的段描述符必须在核心内存中修改，然后重新载入段寄存器。
Each time a segment selector is loaded on to segment registers, the corresponding segment descriptor is loaded from memory into a matching non-programmable CPU register.
每次将段选择器加载到段寄存器中时，对应的段描述符都会从内存加载到相匹配的不可编程CPU寄存器中。
The main function of DMA engine is to handle the receive and transmit data and descriptor transfers between the host memory and the NIC.
DMA引擎的主要功能是进行主机和网卡之间的接收和发送数据以及描述符的传送。
The main function of DMA engine is to handle the receive and transmit data and descriptor transfers between the host memory and the NIC.
DMA引擎的主要功能是进行主机和网卡之间的接收和发送数据以及描述符的传送。
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