c system call return value

References:"Linux kernel design and implementation"0 SummarySystem call process for Linux:Levels such as the following:User program------>C library (i.e. API): INT 0x80----->system_call-------> System invoke Service Routines--------> Kernel

Reference:"Linux kernel design and implementation"0 SummarySystem call process for Linux:The hierarchy is as follows:User program------>C library (i.e. API): INT 0x80----->system_call-------> System invoke Service Routines--------> Kernel

Chapter 5 5.5 Linux system call 5.5.1 System Call Interface System calls (commonly referred to as syscils) are the only interface for interaction between linux kernels and upper-layer applications. See Figure 5-4. According to the description of

This article transferred from: http://www.cnblogs.com/landeanfen/p/5501487.htmlRead Catalogue One, void no return value Second, Ihttpactionresult 1. Json (T content) 2, OK (), OK (T content) 3, NotFound () 4.

implementation of system call under Linux Introduction to architecture and system invocation of Unix/linux operating system what is an operating system and system call The operating system is a virtual machine that is abstracted from the hardware,

function of the return value The return value of the main function is used to describe the exit state of the program. If 0 is returned, the program exits normally, and the meaning of the other numbers is determined by the system. Typically, the

System Call (2): System Call (5) implementation of system calls 1: Implement system calls Implementing a system call is to consider its purpose. Each system call has a definite purpose, in Linux, multi-purpose system calls are not recommended (a

System Call (1), System Call ( (1): communication with the kernel The system call adds an intermediate layer between the user space and the hardware device. This layer has three main functions: 1. It provides a hardware abstract interface for the

1. What is system call In the Linux World, we often encounter the term system call. The so-called system call is a series of functions provided by the kernel with very powerful functions. These system calls are implemented in the kernel, and then

Fifth Chapter system call5.1 communicating with the kernel1. The system call adds a middle layer between the user space process and the hardware device, which has a primary role of three:(1) Provides a hardware abstraction interface for user space(2)