BDD P. Système P. Linéaire POO G. Logiciel Simu Anglais

L3

Sujet

Écrire un programme en C qui crée deux processus communiquant par tube. Le premier processus lit un fichier donné en paramètre, le second processus affiche le contenu du fichier.

#include <stdlib.h>
#define MAX 1024


int main(int argc, char **argv) {
  int pid, T[2], n, i;
  char tampon[MAX];

if (pipe(T) == -1) {
    perror("Erreur de pipe");
    exit(1);
  }

if (argc != 3) {
    perror("Nombre d'arguments incorrect");
    exit(1);
  }

pid = fork();

if (pid < 0) {
    perror("Erreur lors de la creation du processus");
    exit(1);
  }

if (pid == 0) {
    close(T[0]);
<span class="k">while</span> <span class="p">(</span><span class="n">n</span> <span class="o">=</span> <span class="n">read</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">tampon</span><span class="p">,</span> <span class="n">MAX</span><span class="p">))</span>
  <span class="n">write</span><span class="p">(</span><span class="n">T</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">tampon</span><span class="p">,</span> <span class="n">n</span><span class="p">);</span>

} else {
    close(T[1]);
<span class="k">while</span> <span class="p">(</span><span class="n">n</span> <span class="o">=</span> <span class="n">read</span><span class="p">(</span><span class="n">T</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">tampon</span><span class="p">,</span> <span class="n">MAX</span><span class="p">))</span>
  <span class="n">write</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">tampon</span><span class="p">,</span> <span class="n">n</span><span class="p">);</span>

<span class="n">close</span><span class="p">(</span><span class="n">T</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
<span class="n">close</span><span class="p">(</span><span class="n">T</span><span class="p">[</span><span class="mi">1</span><span class="p">]);</span>

}
}