> For the complete documentation index, see [llms.txt](https://0xax.gitbook.io/linux-insides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://0xax.gitbook.io/linux-insides/summary/syscall.md).

# System calls

This chapter describes the `system call` concept in the Linux kernel.

* [Introduction to system call concept](/linux-insides/summary/syscall/linux-syscall-1.md) - this part is introduction to the `system call` concept in the Linux kernel.
* [How the Linux kernel handles a system call](/linux-insides/summary/syscall/linux-syscall-2.md) - this part describes how the Linux kernel handles a system call from a userspace application.
* [vsyscall and vDSO](/linux-insides/summary/syscall/linux-syscall-3.md) - third part describes `vsyscall` and `vDSO` concepts.
* [How the Linux kernel runs a program](/linux-insides/summary/syscall/linux-syscall-4.md) - this part describes startup process of a program.
* [Implementation of the open system call](/linux-insides/summary/syscall/linux-syscall-5.md) - this part describes implementation of the [open](http://man7.org/linux/man-pages/man2/open.2.html) system call.
* [Limits on resources in Linux](/linux-insides/summary/syscall/linux-syscall-6.md) - this part describes implementation of the [getrlimit/setrlimit](https://linux.die.net/man/2/getrlimit) system calls.