Task-killer: a command-line Windows task manager/task killer in C

task-killer.c

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

// Copyright (c) 2016, SYZYGY-DEV333
// All rights reserved.
// Licensed under SPL 1.0 [splicense.pen.io]

int menu();
void lista_processos();
void mata_processo_nome();
void mata_processo_PID();
void mata_processo(char *comando);

FILE *arq;
int op, i;
char processo[1000], cmd_kill[2000], op_menu[2000];

int main() {

  while (menu() == 1);

  system("pause");
  return 0;
}

void lista_processos() {
  char c;
  system("cls");
  arq = system("tasklist");

  while( (c = fgetc(arq))!= EOF )
    printf("%c", c);

  fclose(arq);
}

int menu() {
 int valida = 1;

  printf("\n>  1   | List Process");
  printf("\n>  2   | Kill Process by PID");
  printf("\n>  3   | Kill Process by name");
  printf("\n>  4   | Clear screen");
  printf("\n>  0   | EXIT");
  printf("\n\n>  Your Option is: ");

  do {
    valida = 1;
    scanf("%s", op_menu);

    for (i = 0; op_menu[i] != '\0'; i++)
      if( isdigit(op_menu[i]) == 0 )
        valida = 0;

    if (valida == 0)
      printf("\nOnly positive, numbers: ");

  } while (valida != 1);

  op = atoi(op_menu);

  if (op == 0)
    return 0;
  else if (op == 1)
    lista_processos();
  else if (op == 2)
    mata_processo_PID();
  else if (op == 3)
    mata_processo_nome();
  else
    system("cls");

  return 1;
}

void mata_processo(char *comando) {
  printf("\nexecuta: %s", comando);
}

void mata_processo_nome() {
  printf("\nName of process(example: \"chrome.exe\"): ");
  scanf("%s", processo);

  sprintf(cmd_kill, "TASKKILL /F /IM \"%s\"", processo);
  system("cls");
  system(cmd_kill);

}

void mata_processo_PID() {
  printf("\nPID of process(example: \"1050\"): ");
  scanf("%s", processo);

  sprintf(cmd_kill, "TASKKILL /F /PID \"%s\"", processo);
  system("cls");
  system(cmd_kill);
}

Licence

Copyright (c) 2016, SYZYGY-DEV333
All rights reserved.

Redistribution and use in source or compiled forms, with or
without modification, are permitted provided that the following
conditions are met:

• Redistributions of source code must retain the above
  copyright notice this list of conditions and the following
  disclaimer.

• Redistributions in compiled form must reproduce the
  above copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution. Compiled forms
  are any forms of the software other than source form.

• Neither the name of the [organization] nor the names of
  its contributors may be used to endorse or promote
  products derived from this software without specific prior
  written permission.

• Unless explicitly stated otherwise, contributions submitted
  for inclusion in this software must be under the terms and
  conditions of this License, without any further terms or
  conditions.

• Contributers to this software grant the [organization] a
  permanent patent grant to use, make, sell, and otherwise
  transfer this software, where such license applies only to
  those patent claims licensable by such contributor that are
  necessarily infringed by their contributions alone or by
  combination of their contributions with the Work to which
  such contributions was submitted.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.

I compiled this with Codeblocks/GCC on Windows.