Define "system call", list some of them, and describe the system call mechanics.
- [Voiceover] Surveying the Linux Kernel…Understanding System Call Mechanics.…Let's talk about system calls.…Well, system calls are functions implemented by the kernel…and meant to be called from user space.…They are the application interface to the kernel.…For Linux, there's about 300 of 'em.…You can see the prototypes for the functions…in the "include" file,…include uapi asm-generic uni standard dot h.…Of course, the path name may differ…for different kernel versions…or different implementations, distros of Linux,…but uni standard dot h is a key header file.…
Also, on Linux, in the man pages,…those functions that are system calls…are put in section two.…For example, there's a number of things…that are also commands, and system calls, and maybe files,…so there might be entries in different sections…with the same name.…So, if you want to find out about system call,…you need to look in section two.…Now, "application" doesn't call a system call directly,…as it turns out.…Applications call library functions,…and the system calls from C…
We survey the Linux kernel specification, boot process, and loadable kernel modules. You will practice techniques such as downloading and searching Linux kernel source code and configuring a Linux kernel from scratch. Challenge and solution videos at the end of almost every chapter allow you to test your new Linux skills along the way.
- What is the Linux kernel?
- Controlling hardware
- Reading Linux kernel messages
- Reading and writing files from the proc and sysfs filesystems
- Configuring GRUB
- Using kernel command-line parameters
- Configuring run levels
- Working with loadable kernel modules (LKMs)
- Searching the kernel source code
- Building and installing a Linux kernel
Skill Level Advanced
1. Surveying the Linux Kernel
3. Working with Loadable Kernel Modules
4. Examining Linux Kernel Source Code
5. Configuring and Building a Linux Kernel
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