undefined syscall

A syscall, short for system call, is a programmatic request made by an application to the operating system (OS) for a service or resource that it does not have permission to access directly. Examples of system calls include opening a file, reading or writing data, creating a process, accessing network resources or hardware devices, and managing memory. System calls provide an interface between user-level applications and the kernel of the operating system, allowing them to interact with each other and exchange information. System calls are an essential part of the functionality of any operating system and are often used by programmers to develop low-level software and drivers.