Software Construction

#include <stdio.h>
#include <stdlib.h>

int is_prime(int number) {
    for (int possible_factor = 2; possible_factor < number; possible_factor++) {
        if (number % possible_factor == 0) {
            return 0;
        }
    }
    return 1;
}

int main(int argc, char *argv[]) {
    int n = atoi(argv[1]);
    int n_primes = 0;
    for (int number = 2; n_primes < n; number++) {
        n_primes += is_prime(number);
        if (n_primes == n) {
            printf("%d\n", number);
            return 0;
        }
    }
}

import os, shutil, sys

myname = os.path.basename(sys.argv[0])
if myname == "echo":
    print(*sys.argv[1:])
elif myname == "cp":
    shutil.copyfile(sys.argv[1], sys.argv[2])
elif myname == "rm":
    for pathname in sys.argv[1:]:
        os.unlink(pathname)
else:
    print(f"Unknown name: {myname}", file=sys.stderr)

#include <stdio.h>
#include <linux/reboot.h>
#include <sys/reboot.h>

int main(void) {
   printf("hello from myinit\n");
   reboot(LINUX_REBOOT_CMD_POWER_OFF);
}

FROM alpine

RUN \
	apk update &&\
	# install apache web server
	apk add apache2 curl &&\
	# a configuration file Apache needs
	echo ServerName my-web-server >/etc/apache2/conf.d/localhost.conf

# add a file to the image for our webserver to serve
ADD hello.txt /var/www/localhost/htdocs/hello.txt

# run web-server plus shell when container started
ENTRYPOINT \
	/usr/sbin/httpd &&\
	ash &&\
	killall httpd