Aggiunto il programma di lettura che era rimasto fuori, fatte alcune

[gapil.git] / sources / ReadMonitor.c

diff --git a/sources/ReadMonitor.c b/sources/ReadMonitor.c
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+/* ReadMonitor.c
+ * 
+ * Copyright (C) 2002 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*****************************************************************************
+ *
+ * File ReadMonitor: 
+ *
+ * An example for shared memory use: read data saved in a shared
+ * memory segment from the DirMonitor program
+ *
+ * Author: S. Piccardi Jan. 2003
+ *
+ * $Id: ReadMonitor.c,v 1.1 2003/01/10 09:28:49 piccardi Exp $
+ *
+ *****************************************************************************/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>        /* directory */
+#include <stdlib.h>        /* C standard library */
+#include <unistd.h>
+
+#include "Gapil.h"
+#include "macros.h"
+
+/* Help printing routine */
+void usage(void);
+
+/* variables for shared memory segment */
+int shmid; 
+struct DirProp {
+    int tot_size;    
+    int tot_files;   
+    int tot_regular; 
+    int tot_fifo;    
+    int tot_link;    
+    int tot_dir;     
+    int tot_block;   
+    int tot_char;    
+    int tot_sock;
+};
+struct DirProp *shmptr;
+int mutex;
+
+int main(int argc, char *argv[]) 
+{
+    int i;
+    key_t key;
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "hs:l:wrbf")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':                                            /* help option */
+           printf("Wrong -h option use\n");
+           usage();
+           return -1;
+           break;
+       case '?':                                    /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:                                       /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    /* create needed IPC objects */
+    key = ftok("./DirMonitor.c", 1);                         /* define a key */
+    shmid = shmget(key, 4096, 0);                  /* get a shared memory ID */
+    if (shmid < 0) {
+       perror("Cannot find shared memory");
+       exit(1);
+    }
+    if ( (shmptr = shmat(shmid, NULL, 0)) == NULL ) {   /* attach to process */
+       perror("Cannot attach segment");
+       exit(1);
+    }
+    if ((mutex = MutexFind(key)) == -1) {                   /* get the Mutex */
+       perror("Cannot find mutex");
+       exit(1);
+    }
+    /* main loop */
+    MutexLock(mutex);                                  /* lock shared memory */
+    printf("Ci sono %d file dati\n", shmptr->tot_regular);
+    printf("Ci sono %d directory\n", shmptr->tot_dir);
+    printf("Ci sono %d link\n", shmptr->tot_link);
+    printf("Ci sono %d fifo\n", shmptr->tot_fifo);
+    printf("Ci sono %d socket\n", shmptr->tot_sock);
+    printf("Ci sono %d device a caratteri\n", shmptr->tot_char);
+    printf("Ci sono %d device a blocchi\n", shmptr->tot_block);
+    printf("Totale  %d file, per %d byte\n",
+           shmptr->tot_files, shmptr->tot_size);
+    MutexUnlock(mutex);                              /* unlock shared memory */
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program myls: list file in a directory \n");
+    printf("Usage:\n");
+    printf("  myls [-h] dirname \n");
+    printf("  -h          print this help\n");
+    exit(1);
+}