System-Calls

Time APIs in C: From time() to timespec_get() Time measurement in computing has evolved from simple second-based timestamps to high-precision APIs. This guide covers the main time functions available in C, focusing on timespec_get() - a C11 standard function and its implementation in real-time systems. Why Multiple Time APIs? Time measurement serves different purposes: file timestamps, process scheduling, timeouts, performance measurement, and real-time applications. Each use case has different precision and reliability requirements, leading to multiple APIs optimized for specific needs. ...

The Exit Family: Understanding Program Termination in C When a C program needs to terminate, there are several different functions available, each with distinct behaviors and use cases. Understanding the differences between exit(), _exit(), _Exit(), abort(), and quick_exit() is crucial for writing robust system software and understanding how programs interact with the operating system. The Standard exit() Function The exit() function is the most commonly used program termination function, defined in <stdlib.h>. It performs a clean shutdown of the program by executing cleanup routines before terminating. ...