Prove pratiche 2022

2022-09-07

Esercizio 1

Proposta 1

Da controllare, 09/03/2023

#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <stdlib.h>

int main(int argc, char *const argv[]) {
    if (argc < 2) {
        fprintf(stderr, "Non ci sono abbastanza parametri per lo script\n");
        return 1;
    }

    while (1) {
        int wstatus;
        if (fork()) {
            execvp(argv[1], argv + 1);
        } else {
            wait(&wstatus);
            int status = WEXITSTATUS(wstatus);
            printf("return value ***************** %d\n", status);
            if (status != 0) {
                break;
            }
        }
    }

    return 0;
}

Esercizio 3

Proposta 1

Da contorllare Flecart (talk) 14:52, 9 March 2023 (CET)

import sys
import os
import stat

def is_elf(file):
    with open(file, "rb") as f:
        magic = f.read()[:4]
        if magic == b'\x7fELF':
            return True
    return False

def count(dir):
    if not os.path.isdir(dir):
        return 0

    num_bits = 0 
    for root, dir, files in os.walk(dir):
        for file in files:
            end_path = os.path.join(root, file)
            if is_elf(end_path):
                num_bits += os.lstat(end_path).st_size

        break; # per non andare in altre directory

    return num_bits

if __name__ == "__main__":
    num_args = len(sys.argv);
    
    num_bits = 0
    for i in range(1, num_args):
        num_bits += count(sys.argv[i]) 

    if num_args == 1:
        num_bits += count("./")

    print(f"number of bits is : {num_bits}");