tkt

SCR3.1/TP3/Exo5/v2.c

@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <string.h>
+
+#define SIZE 1000
+
+int search(const unsigned char *t, int start, int end) {
+    int i;
+    for (i = start; i <= end; i++) {
+        if (t[i] == 0) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <number_of_processes>\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    int n_procs = atoi(argv[1]);
+    if (n_procs < 1 || n_procs > 100) {
+        fprintf(stderr, "Number of processes must be between 1 and 100.\n");
+        exit(EXIT_FAILURE);
+    }
+
+    int i, status;
+    unsigned char arr[SIZE];
+    pid_t pid;
+    int found = 0;
+    int chunk_size = SIZE / n_procs;
+    int remainder = SIZE % n_procs;
+
+    srandom(time(NULL));
+
+    for (i = 0; i < SIZE; i++)
+        arr[i] = (unsigned char)(random() % 255) + 1;
+
+    printf("Entrez un nombre entre 0 et %d: ", SIZE - 1);
+    scanf(" %d", &i);
+    if (i >= 0 && i < SIZE) arr[i] = 0;
+
+    for (i = 0; i < n_procs; i++) {
+        pid = fork();
+        if (pid == -1) {
+            perror("fork");
+            exit(EXIT_FAILURE);
+        }
+
+        if (pid == 0) { // Processus fils
+            int start = i * chunk_size;
+            int end = start + chunk_size - 1;
+            if (i == n_procs - 1) { // Le dernier fils gère le reste
+                end += remainder;
+            }
+            int result = search(arr, start, end);
+            exit(result);
+        }
+    }
+
+    for (i = 0; i < n_procs; i++) {
+        waitpid(-1, &status, 0);
+        if (WIFEXITED(status)) {
+            if (WEXITSTATUS(status) == 1) {
+                found = 1;
+            }
+        }
+    }
+
+    if (found)
+        printf("Found !\n");
+    else
+        printf("Not found !\n");
+
+    return EXIT_SUCCESS;
+}
+