Prove pratiche 2022 - Revision history

Flecart: /* Proposta 1 (da controllare) */

2023-04-26T19:34:49Z

Proposta 1 (da controllare)

Flecart at 19:34, 26 April 2023

2023-04-26T19:34:37Z

Keks: /* Proposta 2 */

2023-04-02T12:06:08Z

Proposta 2

Keks: /* Proposta 1 */

2023-04-02T11:54:05Z

Proposta 1

Keks: /* rx */

2023-04-01T14:52:06Z

Keks at 14:50, 1 April 2023

2023-04-01T14:50:48Z

Flecart: /* Proposta 1 */

2023-03-09T14:54:35Z

Proposta 1

Flecart: /* Esercizio 3 */

2023-03-09T13:52:47Z

Esercizio 3

Flecart: /* Esercizio 1 */

2023-03-09T13:17:36Z

Esercizio 1

Flecart: Created page with " = 2022-09-07 = == Esercizio 1 == == Esercizio 2 == == Esercizio 3 == == Esercizio 4 =="

2023-03-09T13:16:00Z

Created page with " = 2022-09-07 = == Esercizio 1 == == Esercizio 2 == == Esercizio 3 == == Esercizio 4 =="

New page

= 2022-09-07 =

== Esercizio 1 ==

== Esercizio 2 ==

== Esercizio 3 ==

== Esercizio 4 ==

@@ Line 182: / Line 182: @@
 === Proposta 1 (da controllare) ===
+[[User:Flecart|Flecart]] ([[User talk:Flecart|talk]]) 21:34, 26 April 2023 (CEST)
 <syntaxhighlight lang="C">

@@ Line 174: / Line 174: @@
      return 0;
+}
 </syntaxhighlight>

@@ Line 91: / Line 91: @@
 <syntaxhighlight lang="python">
 import os, sys, subprocess, re
-print(sum([os.path.getsize(pa+'/'+f) if re.search("ELF\s.*exec", str(subprocess.run(["file", pa+"/"+f], stdout=subprocess.PIPE).stdout)) else 0 for pa in (sys.argv[1:] if len(sys.argv)>1 else ["."]) for f in os.listdir(pa)])+" bytes") if __name__=="__main__" else None
+print(sum([os.path.getsize(pa+'/'+f) if re.search("ELF\s.*exec", str(subprocess.run(["file", pa+"/"+f], stdout=subprocess.PIPE).stdout)) else 0 for pa in (sys.argv[1:] if len(sys.argv)>1 else ["."]) for f in os.listdir(pa)]),"bytes") if __name__=="__main__" else None
 </syntaxhighlight>

← Older revision		Revision as of 11:54, 2 April 2023
Line 87:		Line 87:
	print(f"number of bits is : {num_bits}");		print(f"number of bits is : {num_bits}");

		+	</syntaxhighlight>
		+	=== Proposta 2 ===
		+	<syntaxhighlight lang="python">
		+	import os, sys, subprocess, re
		+	print(sum([os.path.getsize(pa+'/'+f) if re.search("ELF\s.*exec", str(subprocess.run(["file", pa+"/"+f], stdout=subprocess.PIPE).stdout)) else 0 for pa in (sys.argv[1:] if len(sys.argv)>1 else ["."]) for f in os.listdir(pa)])+" bytes") if __name__=="__main__" else None
	</syntaxhighlight>		</syntaxhighlight>

@@ Line 118: / Line 118: @@
              printf("%c", last);
+         }
+     }
      union sigval v;

← Older revision		Revision as of 14:50, 1 April 2023
Line 90:		Line 90:

	== Esercizio 4 ==		== Esercizio 4 ==
		+
		+
		+	= 2022-06-22 =
		+
		+	== Esercizio 1 ==
		+
		+	== Esercizio 2 ==
		+
		+	=== Proposta 1 ===
		+
		+	==== rx ====
		+	<syntaxhighlight lang="C">
		+	#include <stdio.h>
		+	#include <unistd.h>
		+	#include <signal.h>
		+
		+
		+	void received_string(int signo, siginfo_t info, void context){
		+	long msg_long = (long)info->si_value.sival_ptr;
		+	if(msg_long == 0)
		+	printf("\n");
		+	else{
		+	char msg;
		+	for(int i=0, last = 0; i<8; i++){
		+	last = msg_long%256;
		+	msg_long = msg_long>>8;
		+	printf("%c", last);
		+	}
		+	fflush(stdout);
		+	}
		+	union sigval v;
		+	sigqueue(info->si_pid, SIGUSR1, v);
		+	}
		+
		+	int main(int argc, char *argv[]){
		+	printf("%d\n", getpid());
		+	struct sigaction act;
		+	act.sa_sigaction = received_string;
		+	act.sa_flags = SA_SIGINFO;
		+	sigaction(SIGUSR1, &act, NULL);
		+	while(1)
		+	sleep(20);
		+	return 0;
		+	}
		+	</syntaxhighlight>
		+
		+	==== tx ====
		+	<syntaxhighlight lang="C">
		+	#include <signal.h>
		+	#include <stdlib.h>
		+	#include <stdio.h>
		+	#include <unistd.h>
		+
		+	int main(int argc, char *argv[]){
		+	if(argc<3)
		+	exit(EXIT_FAILURE);
		+	int rxpid = atoi(argv[1]),
		+	base = 0,
		+	i,
		+	retsig;
		+	long msg;
		+	union sigval val;
		+
		+	sigset_t ret_set;
		+	sigemptyset(&ret_set);
		+	sigaddset(&ret_set, SIGUSR1);
		+	sigprocmask(SIG_BLOCK, &ret_set, NULL);
		+	do{
		+	msg = 0;
		+	for(i=base; i<base+8&&argv[2][i]!=0; i++)
		+	msg += (long)argv[2][i]<<8*(i%8);
		+	val.sival_ptr = (void*)msg;
		+	sigqueue(rxpid, SIGUSR1, val);
		+	sigwait(&ret_set, &retsig);
		+	base+=8;
		+	}while(argv[2][i]!=0);
		+	val.sival_ptr = 0;
		+	sigqueue(rxpid, SIGUSR1, val);
		+	return 0;
		+	}
		+	</syntaxhighlight>

@@ Line 70: / Line 70: @@
              if is_elf(end_path):
                  num_bits += os.lstat(end_path).st_size
      return num_bits

← Older revision		Revision as of 13:52, 9 March 2023
Line 43:		Line 43:

	== Esercizio 3 ==		== Esercizio 3 ==
		+
		+	=== Proposta 1 ===
		+
		+	Da contorllare [[User:Flecart\|Flecart]] ([[User talk:Flecart\|talk]]) 14:52, 9 March 2023 (CET)
		+
		+	<syntaxhighlight lang="python">
		+	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
		+
		+	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}");
		+
		+	</syntaxhighlight>

	== Esercizio 4 ==		== Esercizio 4 ==

← Older revision		Revision as of 13:17, 9 March 2023
Line 3:		Line 3:

	== Esercizio 1 ==		== Esercizio 1 ==
		+
		+	=== Proposta 1 ===
		+
		+	Da controllare, 09/03/2023
		+
		+	<syntaxhighlight lang="C">
		+
		+	#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;
		+	}
		+	</syntaxhighlight>

	== Esercizio 2 ==		== Esercizio 2 ==