"depot M311"

S3T_TP_06_IPC/Demonstrations/demo_sem.c

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+///*****************************************************************/
+///* IUT NICE-COTE D'AZUR - Departement INFORMATIQUE - R. CHIGNOLI */
+///* Module DUT M311                               Theme IPC POSIX */
+///*****************************************************************/
+/// demo_sem.c : Demonstration d'utilisation d'un sémaphore
+/// usage : commande [-creation]  cle
+/// premier acces : utiliser l'option "-create"
+/// Depuis bash, utiliser la commande ls -l /dev/shm
+/// Depuis bash, utiliser la commande rm /dev/shm/*
+
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <semaphore.h>
+
+int main(int argc, char *argv[]) {
+    char reponse;
+    int mode, encore = 1;
+    sem_t *sem;
+
+    if (argc < 3) {
+        fprintf(stderr, "Usage: %s [ -create | -use ] nom_sem\n",
+                argv[0]);
+        exit(1);
+    }
+    if ((argc == 3) && (strcmp (argv[1], "-create") == 0)) {
+        mode =  O_RDWR | O_CREAT | O_EXCL;
+        printf ("\nMode creation\n\n");
+    } else if ((argc == 3) && (strcmp (argv[1], "-use") == 0)) {
+        mode = O_RDWR;
+        printf ("\nMode utilisation\n\n");
+    } else {
+        fprintf(stderr, "Usage: %s [ -create | -use ] nom\n", argv[0]);
+        exit(2);
+    }
+
+    sem = sem_open(argv[2], mode, 0600, 1);
+    if (sem == SEM_FAILED) {
+        perror ("open");
+        exit (3);
+    }
+    while (encore) {
+        printf("W,P,X,Q ? ");
+        reponse = getchar();
+        __fpurge(stdin); ///... pour bonne gestion du buffer clavier ...
+        switch (reponse) {
+        case 'P':
+            sem_wait (sem);
+            printf("... W OK.\n");
+            break;
+        case 'V':
+            sem_post (sem);
+            printf("... P OK.\n");
+            break;
+        case 'X':
+            sem_close (sem);
+            chdir ("/dev/shm");
+            sem_unlink (argv[2]);
+            printf("\n... Semaphore /dev/shm/sem.%s detruit\n", argv[2]);
+            encore = 0;
+            break;
+        case 'Q':
+            encore = 0;
+            break;
+        default:
+            printf("... Commande incorrecte\n");
+        }
+    }
+    printf("\n... Bye\n\n");
+}

S3T_TP_06_IPC/Demonstrations/demo_shm.c

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+///******************************************************************/
+///* IUT NICE-COTE D'AZUR - Departement INFORMATIQUE - R. CHIGNOLI  */
+///* Module M311                              Theme IPC POSIX       */
+///******************************************************************/
+///* demo_shm.c : Demonstration d'utilisation d'un segment          */
+///*              de memoire partagee                               */
+///* UTILISATION : commande ( -create | -use )                      */
+///* Utiliser ls, etc ... pour gerer les ressources                 */
+///******************************************************************/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <time.h>
+
+/// Type de la zone mémoire
+typedef struct memoire
+{
+    int valeur;
+    int date;
+} Memoire;
+
+int main(int argc, char * argv[])
+{
+    struct memoire *zone;
+    int mem_fd;
+
+    if (argc != 2)
+    {
+        fprintf (stderr, "\nSyntaxe : %s ( -create | -use )\n\n", argv[0]);
+        exit (1);
+    }
+    mem_fd = shm_open ("demo_mem", O_CREAT |O_RDWR, 0777);
+    if (mem_fd == -1)
+    {
+        perror("shm_open");
+        exit (1);
+    }
+    if (ftruncate(mem_fd, sizeof(struct memoire)) != 0)
+    {
+        perror("ftruncate");
+        exit(2);
+    }
+    zone = mmap (NULL, 100, PROT_READ | PROT_WRITE, MAP_SHARED, mem_fd, 0);
+    if (zone  ==  (void *) -1)
+    {
+        perror("mmap");
+        exit (3);
+    }
+    if ((strcmp (argv[1], "-create")!= 0) && (strcmp (argv[1], "-use")!= 0))
+    {
+        fprintf (stderr, "\nSyntaxe : %s ( -create | -use )\n\n", argv[0]);
+        exit (2);
+    }
+    if (strcmp (argv[1], "-create")== 0)
+    {
+        zone->valeur = 0;
+        zone->date =time(NULL);
+        printf("\nCREATE : VALEURS en memoire : valeur = %d - date = %s\n",
+                zone->valeur, ctime ((time_t*)&zone->date));
+    }
+    else /// -use
+    {
+        printf("\nUSE : ANCIENNES VALEURS en memoire : valeur = %d - date = %s \n",
+                zone->valeur, ctime ((time_t*)&zone->date));
+        zone->valeur++;
+        zone->date =time(NULL);
+        printf("USE : NOUVELLES VALEURS en memoire : valeur = %d - date = %s \n",
+        zone->valeur, ctime ((time_t*)&zone->date));
+    }
+    
+
+    close(mem_fd);
+    return 0;
+}