--- /dev/null
+/* 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);
+}
projects / gapil.git / blobdiff