X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2FDirMonitor.c;fp=sources%2FDirMonitor.c;h=e4c3dc538fd9649c6b79b5b214ab24c0a87c2faa;hp=0000000000000000000000000000000000000000;hb=b1ead1b930038e4f7cd6ee7f737d7ee4699a068c;hpb=d12bc3e1e4b3ee762036d1c226c3b2ba1a720fb9

diff --git a/sources/DirMonitor.c b/sources/DirMonitor.c
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+++ b/sources/DirMonitor.c
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+/* DirMonitor.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 DirMonitor: 
+ *
+ * An example for shared memory use: monitor a directory status,
+ * saving data in a shared memory segment
+ *
+ * Author: S. Piccardi Jan. 2003
+ *
+ * $Id: DirMonitor.c,v 1.8 2003/05/02 09:55:13 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);
+/* computation function for DirScan */
+int ComputeValues(struct dirent * direntry);
+void HandSIGTERM(int signo);
+
+/* global variables for shared memory segment */
+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;
+} *shmptr;
+key_t key;
+int mutex;
+
+int main(int argc, char *argv[]) 
+{
+    int i, pause = 10;
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;	 /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "hp:")) != -1) {
+	switch (i) {
+	/* 
+	 * Handling options 
+	 */ 
+	case 'p':                                     /* set pause (in sec.) */
+	    pause = strtol(optarg, NULL, 10);
+	    break;
+	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
+     * 
+     * ***********************************************************/
+    if ((argc - optind) != 1) {          /* There must be remaing parameters */
+	printf("Wrong number of arguments %d\n", argc - optind);
+        usage();
+    }
+    if (chdir(argv[1])) {                      /* chdir to be sure dir exist */
+	perror("Cannot find directory to monitor");
+	exit(1);
+    }
+    Signal(SIGTERM, HandSIGTERM);            /* set handlers for termination */
+    Signal(SIGINT, HandSIGTERM);
+    Signal(SIGQUIT, HandSIGTERM);
+    key = ftok("~/gapil/sources/DirMonitor.c", 1);  /* define a key, use dir */
+    shmptr = ShmCreate(key, 4096, 0666, 0);   /* get a shared memory segment */
+    if (!shmptr) {
+	perror("Cannot create shared memory");
+	exit(1);
+    }
+    if ((mutex = MutexCreate(key)) == -1) {                   /* get a Mutex */
+	perror("Cannot create mutex");
+	exit(1);
+    }
+    /* main loop, monitor directory properties each 10 sec */
+    daemon(1, 0);              /* demonize process, staying in monitored dir */
+    while (1) {
+	MutexLock(mutex);                              /* lock shared memory */
+	memset(shmptr, 0, sizeof(struct DirProp));    /* erase previous data */
+	DirScan(argv[1], ComputeValues);                     /* execute scan */
+	MutexUnlock(mutex);                          /* unlock shared memory */
+	sleep(pause);                              /* sleep until next watch */
+    }
+}
+/*
+ * Routine to compute directory properties inside DirScan
+ */
+int ComputeValues(struct dirent * direntry) 
+{
+    struct stat data;
+    stat(direntry->d_name, &data);                          /* get stat data */
+    shmptr->tot_size += data.st_size;
+    shmptr->tot_files++;
+    if (S_ISREG(data.st_mode)) shmptr->tot_regular++;
+    if (S_ISFIFO(data.st_mode)) shmptr->tot_fifo++;
+    if (S_ISLNK(data.st_mode)) shmptr->tot_link++;
+    if (S_ISDIR(data.st_mode)) shmptr->tot_dir++;
+    if (S_ISBLK(data.st_mode)) shmptr->tot_block++;
+    if (S_ISCHR(data.st_mode)) shmptr->tot_char++;
+    if (S_ISSOCK(data.st_mode)) shmptr->tot_sock++;
+    return 0;
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program myls: list file in a directory \n");
+    printf("Usage:\n");
+    printf("  DirMonitor [-h] [-p sec] dirname \n");
+    printf("  -h	   print this help\n");
+    printf("  -p sec	   set watch interval to sec seconds \n");
+    exit(1);
+}
+/*
+ * Signal Handler to manage termination
+ */
+void HandSIGTERM(int signo) {
+    MutexLock(mutex);
+    debug("Terminated by %s\n", strsignal(signo));
+    ShmRemove(key, shmptr);
+    MutexRemove(mutex);
+    exit(0);
+}