Archiv rubriky: ping

OpenWrt 6: ping watchdog

Napsat komentář

Obcas se stane, ze spadne internet, vytuhne router, nebo nastane chyba v Matrixu. Prave pro tyto pripady se hodi mit watchdog.

Celý příspěvek →

Sleep ve Windows

Napsat komentář

Program sleep pocka pozadovanou dobu a ukonci se. V Linuxu casto pouzivam tento program pri psani skriptu. Ve Windows XP vsak nic podobneho neni. Co by kdo taky cekal od 8 let stareho operacniho systemu (XP je z 25.10.2001)? Jak je to s Windows Vista nevim – nepouzivam.

V Linuxu je syntaxe nasledujici:
sleep 3
pocka 3s

I kdyz ve Windows XP nic podobneho neni, lze si pomoci jinak – programem PING. Kazdeho asi napadne, co ma ping a sleep spolecneho. Odpoved je jednoducha, jestlize se ping spusti se spravnymi parametry, funguje stejne jako sleep. Popis vsech parametru je na strankach Microsoftu.

ping 127.0.0.1 -n 3 -w 1000> nul
pocka 3s

-w doba, po kterou bude ping cekat na odpoved. Zadava se v ms.
-n pocet pozadavku na odpoved. Jelikoz ma ping na localhost (127.0.0.1) prakticky nulovou odezvou, poslouzi jako parametr pro "uspani".

> nul zahodit (nevypisovat) vypisy

Nejjednodussi je vytvorit program, ktery bude vyuzivat funkci sleep. V C by se to dalo napsat nejak podobne:

<font color="#0000ff"><strong>#include <font color="#008000"><stdio.h></font></strong></font> <font color="#0000ff"><strong>#include <font color="#008000"><stdlib.h></font></strong></font> <font color="#0000ff"><strong>#include <font color="#008000"><Windows.h></font> <font color="#444444"> /* sleep() */</font></strong></font> <strong>int</strong> <font color="#2040a0">main</font><font color="#4444ff">(</font><strong>int</strong> <font color="#2040a0">argc</font>, <strong>char</strong> <font color="#4444ff">*</font><font color="#2040a0">argv</font><font color="#4444ff">[</font><font color="#4444ff">]</font><font color="#4444ff">)</font> <font color="#4444ff"><strong>{</strong></font> <strong>int</strong> <font color="#2040a0">cekat</font><font color="#4444ff">;</font> <strong>if</strong> <font color="#4444ff">(</font><font color="#2040a0">argv</font><font color="#4444ff">[</font><font color="#ff0000">1</font><font color="#4444ff">]</font> <font color="#4444ff">=</font><font color="#4444ff">=</font> <font color="#2040a0">NULL</font><font color="#4444ff">)</font> <font color="#4444ff"><strong>{</strong></font> <font color="#2040a0">printf</font><font color="#4444ff">(</font><font color="#008000">"Jako parametr uvedte cas v sekundach!<font color="#77dd77">\n</font>"</font><font color="#4444ff">)</font><font color="#4444ff">;</font> <font color="#4444ff"><strong>}</strong></font> <strong>else</strong> <font color="#4444ff"><strong>{</strong></font> <strong>while</strong> <font color="#4444ff">(</font><font color="#4444ff">(</font><font color="#2040a0">cekat</font> <font color="#4444ff">=</font> <font color="#2040a0">atoi</font><font color="#4444ff">(</font><font color="#2040a0">argv</font><font color="#4444ff">[</font><font color="#ff0000">1</font><font color="#4444ff">]</font><font color="#4444ff">)</font><font color="#4444ff">)</font> <font color="#4444ff">=</font><font color="#4444ff">=</font> <font color="#ff0000">0</font><font color="#4444ff">)</font><font color="#4444ff">;</font> <font color="#444444">/* retezec z argv[1] se prevede na cislo */</font> <font color="#2040a0">cekat</font> <font color="#4444ff">=</font> <font color="#4444ff">(</font><font color="#2040a0">cekat</font> <font color="#4444ff">*</font> <font color="#ff0000">1000</font><font color="#4444ff">)</font><font color="#4444ff">;</font> <font color="#444444">/* funkci sleep se musi zadavat cas v [ms] => * 1000 */</font> <font color="#2040a0">sleep</font><font color="#4444ff">(</font><font color="#2040a0">cekat</font><font color="#4444ff">)</font><font color="#4444ff">;</font> <font color="#4444ff"><strong>}</strong></font> <strong>return</strong> <font color="#ff0000">0</font><font color="#4444ff">;</font> <font color="#4444ff"><strong>}</strong></font>

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<font color="#0000ff"><strong>#include <font color="#008000"><stdio.h></font></strong></font>
<font color="#0000ff"><strong>#include <font color="#008000"><stdlib.h></font></strong></font>
<font color="#0000ff"><strong>#include <font color="#008000"><Windows.h></font> <font color="#444444"> /* sleep() */</font></strong></font>

<strong>int</strong> <font color="#2040a0">main</font><font color="#4444ff">(</font><strong>int</strong> <font color="#2040a0">argc</font>, <strong>char</strong> <font color="#4444ff">*</font><font color="#2040a0">argv</font><font color="#4444ff">[</font><font color="#4444ff">]</font><font color="#4444ff">)</font>
<font color="#4444ff"><strong>{</strong></font>
  <strong>int</strong> <font color="#2040a0">cekat</font><font color="#4444ff">;</font>

  <strong>if</strong> <font color="#4444ff">(</font><font color="#2040a0">argv</font><font color="#4444ff">[</font><font color="#ff0000">1</font><font color="#4444ff">]</font> <font color="#4444ff">=</font><font color="#4444ff">=</font> <font color="#2040a0">NULL</font><font color="#4444ff">)</font>
  <font color="#4444ff"><strong>{</strong></font>
    <font color="#2040a0">printf</font><font color="#4444ff">(</font><font color="#008000">"Jako parametr uvedte cas v sekundach!<font color="#77dd77">\n</font>"</font><font color="#4444ff">)</font><font color="#4444ff">;</font>
  <font color="#4444ff"><strong>}</strong></font>
  <strong>else</strong>
  <font color="#4444ff"><strong>{</strong></font>
    <strong>while</strong> <font color="#4444ff">(</font><font color="#4444ff">(</font><font color="#2040a0">cekat</font> <font color="#4444ff">=</font> <font color="#2040a0">atoi</font><font color="#4444ff">(</font><font color="#2040a0">argv</font><font color="#4444ff">[</font><font color="#ff0000">1</font><font color="#4444ff">]</font><font color="#4444ff">)</font><font color="#4444ff">)</font> <font color="#4444ff">=</font><font color="#4444ff">=</font> <font color="#ff0000">0</font><font color="#4444ff">)</font><font color="#4444ff">;</font>
    <font color="#444444">/* retezec z argv[1] se prevede na cislo */</font>

    <font color="#2040a0">cekat</font> <font color="#4444ff">=</font> <font color="#4444ff">(</font><font color="#2040a0">cekat</font> <font color="#4444ff">*</font> <font color="#ff0000">1000</font><font color="#4444ff">)</font><font color="#4444ff">;</font>
    <font color="#444444">/* funkci sleep se musi zadavat cas v [ms] => * 1000 */</font>

    <font color="#2040a0">sleep</font><font color="#4444ff">(</font><font color="#2040a0">cekat</font><font color="#4444ff">)</font><font color="#4444ff">;</font>
   <font color="#4444ff"><strong>}</strong></font>

   <strong>return</strong> <font color="#ff0000">0</font><font color="#4444ff">;</font>
<font color="#4444ff"><strong>}</strong></font>

Pokud to nekdo chcete pouzit, tady je 32bit exe. Jestlize ma nekdo 64bit, nebo si to chce nejak upravit, tak tady je projekt v Dev-C++.

Program je dobre nakopirovat do C:\Windows, nebo do jine slozky, ktera je uvedena v promene PATH.