System_Software_HandsOnList2/002.c at main · superv13/System_Software_HandsOnList2 · GitHub

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/*
..........................................................................................................................................
Name : 002.c
Author : SHRUTI VERMA
Description : Write a program to print the system resource limits. Use getrlimit system call.
Date : 29 Sep 2025
..........................................................................................................................................
*/

#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<sys/resource.h>

void print_limit(int resource, const char *name) {
    struct rlimit rl;

    (getrlimit(resource, &rl) == 0);
    long int soft = (long) rl.rlim_cur;
    long int hard = (long) rl.rlim_max;

    printf("%-20s Soft Limit : ", name);
    if(soft == RLIM_INFINITY)
    printf("UNLIMITED\t");
    else printf("%ld  \t", soft);

    printf("Hard Limit : ");
    if(hard == RLIM_INFINITY)
    printf("UNLIMITED\n");
    else printf("%ld\n", hard);
    //printf("%-20s: Soft limit = %ld, Hard limit = %ld\n", name, soft, hard);

}

int main() {

    print_limit(RLIMIT_CPU, "CPU Time");
    print_limit(RLIMIT_FSIZE, "File Size");
    print_limit(RLIMIT_DATA, "Data Segment Size");
    print_limit(RLIMIT_STACK, "Stack Size");
    print_limit(RLIMIT_CORE, "Core File Size");
    print_limit(RLIMIT_RSS, "Resident Set Size");
    print_limit(RLIMIT_NOFILE, "Number of Open Files");
    print_limit(RLIMIT_AS, "Address Space Size");
    print_limit(RLIMIT_NPROC, "Number of Processes");
    print_limit(RLIMIT_MEMLOCK, "Locked Memory Size");
    print_limit(RLIMIT_LOCKS, "File Locks");

    return 0;
}

/*--------------------------------_OUTPUT------------------------------------------------------
CPU Time             Soft Limit : UNLIMITED     Hard Limit : UNLIMITED
File Size            Soft Limit : UNLIMITED     Hard Limit : UNLIMITED
Data Segment Size    Soft Limit : UNLIMITED     Hard Limit : UNLIMITED
Stack Size           Soft Limit : 8388608       Hard Limit : UNLIMITED
Core File Size       Soft Limit : 0     Hard Limit : UNLIMITED
Resident Set Size    Soft Limit : UNLIMITED     Hard Limit : UNLIMITED
Number of Open Files Soft Limit : 1048576       Hard Limit : 1048576
Address Space Size   Soft Limit : UNLIMITED     Hard Limit : UNLIMITED
Number of Processes  Soft Limit : 30107         Hard Limit : 30107
Locked Memory Size   Soft Limit : 1025282048    Hard Limit : 1025282048
File Locks           Soft Limit : UNLIMITED     Hard Limit : UNLIMITED
*/