X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2Finotify_monitor.c;h=60fa1035f8d5e4b2af625e92277c4648e3ecd8a1;hp=d2c4f2dd543b684d340442327ff94297349782f9;hb=26f7a8bb19c6cb198c213757a97b6ac79e40db4b;hpb=60e20d29c0515f95b8a171fb33c7214c9bf92021

diff --git a/sources/inotify_monitor.c b/sources/inotify_monitor.c
index d2c4f2d..60fa103 100644
--- a/sources/inotify_monitor.c
+++ b/sources/inotify_monitor.c
@@ -18,70 +18,84 @@
  */
 /*****************************************************************************
  *
- * File inotufy_monitor.c: 
+ * File inotify_monitor.c: 
  *
- * An example for shared memory use: monitor a directory status,
- * saving data in a shared memory segment
+ * An example of the inotify interface: use inotify to watch the
+ * status of a directory or a file
  *
  * Author: S. Piccardi Jul. 2007
  *
  *****************************************************************************/
-#include <sys/types.h>
-#include <sys/inotify.h>
-#include <stdlib.h>        /* C standard library */
-#include <unistd.h>
+#include <sys/types.h>   /* primitive system data types */
+#include <sys/stat.h>    /* file characteristics constants and functions */
+#include <sys/inotify.h> /* Linux inotify interface */
+#include <stdlib.h>      /* C standard library */
+#include <unistd.h>      /* unix standard library */
 #include <errno.h>       /* error definitions and routines */ 
 #include <stdio.h>       /* standard I/O library */
-#include <string.h>      /* string functions */
+#include <string.h>      /* C strings library */
+#include <fcntl.h>       /* file control functions */
+#include <sys/ioctl.h>   /* ioctl syscall and constants */
 
 
 #include "macros.h"
 
 /* Help printing routine */
 void usage(void);
+void printevent(unsigned int mask);
 
 int main(int argc, char *argv[]) 
 {
-    int i;
-    int fd;
+    int i, narg, nread;
+    int fd, wd;
+    char buffer[512 * (sizeof(struct inotify_event) + 16)];
     unsigned int mask=0;
+    struct inotify_event * event;
     /*
      * Input section: decode command line parameters 
      * Use getopt function
      */
     opterr = 0;	 /* don't want writing to stderr */
-    while ( (i = getopt(argc, argv, "hrwcda")) != -1) {
+    while ((i = getopt(argc, argv, "hrwcdaCM")) != -1) {
 	switch (i) {
 	/* 
 	 * Handling options 
 	 */ 
-	case 'h':                                             /* help option */
+	case 'h':       /* help option */
 	    printf("Wrong -h option use\n");
 	    usage();
-	    return -1;
-	    break;
-	case 'r':                                             /* read access */
+	case 'r':       /* read access */
 	    mask |= IN_ACCESS;
 	    break;
-	case 'w':                                            /* write access */
+	case 'w':       /* write access */
 	    mask |= IN_MODIFY;
 	    break;
-	case 'c':                                                /* creation */
+	case 'c':       /* creation */
 	    mask |= IN_CREATE;
 	    break;
-	case 'd':                                                /* deletion */
+	case 'd':       /* deletion */
 	    mask |= IN_DELETE;
 	    break;
-	case 'a':                                              /* all events */
+	case 'a':       /* all events */
 	    mask |= IN_ALL_EVENTS;
 	    break;
-	case '?':                                    /* unrecognized options */
+	case 'C':       /* creation */
+	    mask |= IN_CLOSE;
+	    break;
+	case 'M':       /* creation */
+	    mask |= IN_MOVE;
+	    break;
+	case '?':       /* unrecognized options */
 	    printf("Unrecognized options -%c\n",optopt);
 	    usage();
-	default:                                       /* should not reached */
+	default:        /* should not reached */
 	    usage();
 	}
     }
+    if (mask == 0) {
+	printf("No events to monitor\n");
+	usage();
+    }
     /* ***********************************************************
      * 
      *		 Options processing completed
@@ -89,24 +103,53 @@ int main(int argc, char *argv[])
      *		      Main code beginning
      * 
      * ***********************************************************/
-    if ((argc - optind) != 1) {          /* There must be remaing parameters */
+    narg = argc - optind; 
+    if (narg < 1) { /* There must be at least one argument */
 	printf("Wrong number of arguments %d\n", argc - optind);
         usage();
     }
-    /* initalialize */
-    fd = inotify_init ();
-    if (fd < 0)
-        perror("Failing on inotify_init");
-
-    /* add watch */
-    if (inotify_add_watch(fd, argv[1], mask) != 0) {
-	printf("Failing to add watched file %s; %s\n", 
-	      argv[1], strerror(errno));
+    fd = inotify_init();       /* initialize inotify */
+    if (fd < 0) {
+	perror("Failing on inotify_init");
 	exit(-1);
     }
-
+    i = 0;
+    while (i < narg) {
+	wd = inotify_add_watch(fd, argv[optind+i], mask);  /* add watch */
+	if (wd <= 0) {
+	    printf("Failing to add watched file %s, mask %i; %s\n", 
+		   argv[optind+i], mask, strerror(errno));
+	    exit(-1);
+	}
+	i++;
+    }
+    /* 
+     * Main Loop: read events and print them
+     */
+    while (1) {
+	nread = read(fd, buffer, sizeof(buffer));
+	if (nread < 0) {
+	    if (errno == EINTR) {
+		continue;
+	    } else {
+		perror("error reading inotify data");
+		exit(1);
+	    }
+	} else {
+	    i = 0;
+	    while (i < nread) { 
+		event = (struct inotify_event *) buffer + i;
+		printf("Watch descriptor %i\n", event->wd);
+		printf("Observed event on %s\n", argv[optind-1+event->wd]);
+		if (event->len) {
+		    printf("On file %s\n", event->name);
+		}
+		printevent(event->mask);
+		i += sizeof(struct inotify_event) + event->len;
+	    }
+	}
+    }
     return 0;
-
 }
 /*
  * routine to print usage info and exit
@@ -114,12 +157,45 @@ int main(int argc, char *argv[])
 void usage(void) {
     printf("Program inotify_monitor: monitor file changes \n");
     printf("Usage:\n");
-    printf(" inotify_monitor [-h] -rwcd dirname/filename \n");
+    printf(" inotify_monitor [-h] -rwcdCMa dirname/filename dir/file ... \n");
     printf("  -h	   print this help\n");
     printf("  -w	   watch write\n");
     printf("  -r	   watch read\n");
     printf("  -c	   watch create\n");
     printf("  -d	   watch delete\n");
+    printf("  -C	   watch closing\n");
+    printf("  -M	   watch moving\n");
     printf("  -a	   watch all\n");
     exit(1);
 }
+
+void printevent(unsigned int mask) {
+    int i;
+    int val;
+    char * inotify_event[] = {
+	"IN_ACCESS", 
+	"IN_MODIFY", 
+	"IN_ATTRIB", 
+	"IN_CLOSE_WRITE", 
+	"IN_CLOSE_NOWRITE", 
+	"IN_OPEN", 
+	"IN_MOVED_FROM", 
+	"IN_MOVED_TO",
+	"IN_CREATE", 
+	"IN_DELETE", 
+	"IN_DELETE_SELF", 
+	"IN_MOVE_SELF", 
+	"ERROR!!!", 
+	"IN_UNMOUNT", 
+	"IN_Q_OVERFLOW", 
+	"IN_IGNORED"
+    };
+    
+    val=1;
+    for (i=0; i<16; i++) {
+	if (mask & val) 
+	    printf("%s, ", inotify_event[i]); 
+	val = val << 1;
+    }
+    printf("\n");
+}