Understanding system calls on Linux with strace
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A system call is a programmatic way a program requests a service from the kernel, and strace is a powerful tool that allows you to trace the thin layer between user processes and the Linux kernel.
To understand how an operating system works, you first need to understand how system calls work. One of the main functions of an operating system is to provide abstractions to user programs.
An operating system can roughly be divided into two modes:
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