Method and device for acquiring limited access information in user mode

Abstract

The invention discloses a method and a device for acquiring limited access information in a user mode. The method comprises the following steps: applying a large-block continuous memory as a shared memory and recording the address and the size of the memory when a Linux kernel is initialized; creating a data structure of the limited access information in the kernel and enabling a storage path of the data structure to point to the address of the applied shared memory; acquiring the limited access information by the creating thread of the kernel and assigning the acquired limited access information to the data structure of the limited access information in the shared memory; when the user mode is initialized, acquiring the address and the size of the applied shared memory, creating a data structure of the limited access information which is consistent with that of the kernel, and enabling the storage path of the created data structure to point to the address of the shared memory. According to the method and the device disclosed by the invention, the loss performance of the system is minimized while the limited access information is acquired in the user mode.

Description

technical field [0001] The invention belongs to the technical field of computer networks, and in particular relates to a method and a device for obtaining restricted access information in a user state. Background technique [0002] At present, the access information obtained directly from the kernel by the Linux user mode is limited. If the user mode wants to obtain those restricted access information directly from the kernel, some methods must be adopted. For example, when the Linux kernel drives a network device, it can normally obtain the interface status of the network device, such as the up / down status, speed, duplex status, and statistics of packets sent and received by the interface of the network device. Common, but for kernel-driven devices, the user mode cannot directly read the hardware registers, resulting in the user mode not being able to directly obtain the interface status of the network device, that is, the direct access to the interface status of the networ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for obtaining restricted access information in the user state, which can meet the perception needs of the user state for restricted access information, and at the same time reduce the loss of system performance, so as to solve the problem of using other communications in the user state. The problem of degrading system performance by obtaining restricted access information

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