Re: lug-bg: system()

[mitko@xxxxxxx (Dimitar Peikov)]

On Sun, 5 May 2002 15:07:22 +0300
"Ilia Trendafilov" <edac@xxxxxxxxxxx> wrote:

>     Zdraveite,
>   Kak moga da ubia process pusnat ot programa chrez system()? Ideiata
>   e ako procesa ne e grymnal sled niakolko sekundi da se ubiva rychno.
>   Zasega edinstvenoto smisleno neshto do koeto uspiah da stigna e
>   neshto ot roda
> 
> signal(SIGALRM,killchild);
> alarm(3);
> system("wa");
> signal(SIGALRM,SIG_DFL);

Ne ti preporuchvam da polzvash system(), mozesh da beresh jadove. Po dobra realizacia e fork() - exec(), kato v tozi varian njama da ti se nalozi da pravish evristiki po koj proces trjabva da streljash s pushkata kill().

> 
> Vyprosyt e kakvo tochno da sydyrja procedurata killchild(), taka che
> da ubiva. Ne e zadyljitelno za celta da se izpolzva system(), no tova
> mi se vijda po-prosto ot fork() i exec()-proizvodni funkcii, pyk i
> dori da izpolzvam exec() pak ne moga da se setia za nachin da grymna
> procesa.  Pak v syshtia duh - kak moga da ogranicha po niakakyv nachin
> pametta izpolzvana ot vyprosnia child process do niakakvi tvyrdi
> granici naprimer 16MB data size i 1MB stack. Znam za setrlimit(), samo

Viz primera po dolu. Ako v 'ulimit -a' imash njakakvi po malki ogranichenja tova njama da sraboti (man getrlimit)!

----------------------------
#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>

int zzz() {
  struct rlimit my_limit;

  if (getrlimit(RLIMIT_DATA, &my_limit) != 0) {
        /* Error */
        return -1;
  }

  printf("RLIMIT_DATA: %u %u\n", my_limit.rlim_cur, my_limit.rlim_max);

  if (getrlimit(RLIMIT_STACK, &my_limit) != 0) {
        /* Error */
        return -1;
  }

  printf("RLIMIT_STACK: %u %u\n", my_limit.rlim_cur, my_limit.rlim_max);

}

int xxx() {
  struct rlimit my_limit;

  my_limit.rlim_cur = 1024 * 16;
  my_limit.rlim_max = 1024 * 16;
  if (setrlimit(RLIMIT_DATA, &my_limit) != 0) {
        /* Error */
        return -1;
  }

  my_limit.rlim_cur = 1024 * 1;
  my_limit.rlim_max = 1024 * 1;
  if (setrlimit(RLIMIT_STACK, &my_limit) != 0) {
        /* Error */
        return -1;
  }

  return 0;
}

int main() {
  zzz();
  xxx();
  zzz();
}

----------------------------

> che (ne mi se smeite :) ne mojah da zacepia kak tochno raboti...
>   Blagodaria predvaritelno...
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-- 
Dimitar Peikov
Programmer Analyst
Globalization Group
"We Build e-Business"  

RILA Solutions  
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1113 Sofia, Bulgaria  

phone: (+359 2) 9797320 
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