System Monitoring Program

Overview

This C program provides a comprehensive system monitoring tool, collecting and displaying information on CPU usage, memory utilization, and active user sessions. The program utilizes various system calls and signals to retrieve and present real-time data.

Dependencies

• Standard C Library (libc)
• Linux-specific libraries: sys/resource.h, utmp.h, unistd.h, sys/sysinfo.h, string.h, sys/utsname.h
• Custom header file: systemUtil.h

Compilation

gcc systemMonitor.c systemUtil.c -o systemMonitor -lm

Usage

The program supports the following command-line options:

--samples=: Number of samples to collect (default: 10) --tdelay=: Time delay between samples in seconds (default: 1) --sequential: Display output in sequential mode --graphics or -g: Enable graphical representation of data --user: Display information about active user sessions --system: Display additional system information Example usage:

bash
Copy code
./systemMonitor --samples=20 --tdelay=2 --sequential --graphics --user --system

Features

CPU Usage: Displays total CPU usage over time, with an optional graphical representation. Memory Utilization: Shows physical and virtual memory usage, along with graphical representation. User Sessions: Lists users currently logged in along with their session details. System Information: Provides basic information about the system. Signals The program responds to the following signals:

SIGINT (Ctrl-C): Gracefully terminates the program after user confirmation. SIGTSTP (Ctrl-Z): Pauses the program, allowing the user to decide whether to continue or exit.

Notes

The program uses forked processes to simultaneously collect CPU, memory, and user information. Graphics mode displays a visual representation of data changes over time.