squelette

.gitignore

+cheval
+*.o
\ No newline at end of file

Makefile

+CC = gcc
+CFLAGS = -Wall
+
+cheval: main.o user.o
+	$(CC) -o cheval main.o user.o
+
+clean:
+	rm *.o
+	rm cheval

main.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "user.h"
+
+#define NB_USERS 4
+#define NB_CHEVALS 4
+
+int main(int argc, char ** argv){
+  user_t users[NB_USERS];
+  int pipes[2];
+  
+  int pipes_b[2], o_pipes_b[2];
+  if(pipe(pipes_b)){
+    fprintf(stderr, "erreur de creation du pipe principal");
+    exit(0);
+  }
+  pipes[1] = pipes_b[1];
+  o_pipes_b[0] = pipes_b[0];
+  
+  for(int i=0; i<NB_USERS; i++){
+    o_pipes_b[0] = pipes_b[0];
+    if(pipe(pipes_b)){
+      fprintf(stderr, "erreur de creation de pipe");
+      exit(-1);
+    }
+    
+    switch(fork()){
+      case -1:
+        fprintf(stderr, "Erreur lors du fork");
+        exit(-1);
+      break;
+      case 0:
+        ;
+        int p[2];
+        p[0] = o_pipes_b[0]; // pipe de sortie du fils précedent
+        
+        p[1] = pipes_b[1]; // pipe d'entree du fils suivant
+        user_t user = user_init(i, NB_CHEVALS, p);
+        while(1) user_loop(user);
+      break;
+    }
+  }
+  pipes[0] = pipes_b[0];
+
+  int in = 12;
+  write(pipes[1], &in, sizeof(int));
+  
+  int out;
+  read(pipes[0], &out, sizeof(int));
+  printf("master %d\n", out);
+}

user.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "user.h"
+
+user_t user_init(unsigned int id, unsigned int nb_cheval, int pipes[]){
+  cheval_t chevals[nb_cheval];
+  
+  user_t out = {
+    .id = id,
+    .c = chevals,
+    .nb_chevals = nb_cheval,
+    .pipes = pipes,
+  };
+
+  return out;
+}
+
+void user_loop(user_t user){
+  int out;
+  read(user.pipes[0], &out, sizeof(int));
+  printf("I'm user %d : %d \n", user.id, out);
+  out++;
+  write(user.pipes[1], &out, sizeof(int));
+}
\ No newline at end of file

user.h

+
+typedef struct {
+  int pos;
+  int escalier; // si le cheval est dans l'escalier
+} cheval_t;
+
+typedef struct {
+  unsigned int id;
+  cheval_t* c;
+  unsigned char nb_chevals;
+  int* pipes;
+} user_t;
+
+user_t user_init(unsigned int id, unsigned int nb_cheval, int pipes[]);
+void user_loop(user_t user);