inotify test

tests/inotify.c

@@ -0,0 +1,66 @@
+/*This is the sample program to notify us for the file creation and file deletion takes place in “/tmp” directory*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/inotify.h>
+#include <unistd.h>
+
+#define EVENT_SIZE  ( sizeof (struct inotify_event) )
+#define EVENT_BUF_LEN     ( 1024 * ( EVENT_SIZE + 16 ) )
+
+int main( )
+{
+  int length, i = 0;
+  int fd;
+  int wd;
+  char buffer[EVENT_BUF_LEN];
+
+  /*creating the INOTIFY instance*/
+  fd = inotify_init1(IN_NONBLOCK);
+
+  /*checking for error*/
+  if ( fd < 0 ) {
+    perror( "inotify_init" );
+  }
+
+  /*adding the “/tmp” directory into watch list. Here, the suggestion is to validate the existence of the directory before adding into monitoring list.*/
+  wd = inotify_add_watch( fd, "/dev/input/", IN_CREATE | IN_DELETE );
+
+  printf("%d\t%d\n", fd, wd);
+  /*read to determine the event change happens on “/tmp” directory. Actually this read blocks until the change event occurs*/
+  while ((length = read( fd, buffer, EVENT_BUF_LEN )) < 0);
+
+  /*checking for error*/
+  if ( length < 0 ) {
+    perror( "read" );
+  }
+
+  /*actually read return the list of change events happens. Here, read the change event one by one and process it accordingly.*/
+  while ( i < length ) {     struct inotify_event *event = ( struct inotify_event * ) &buffer[ i ];     if ( event->len ) {
+      if ( event->mask & IN_CREATE ) {
+        if ( event->mask & IN_ISDIR ) {
+          printf( "New directory %s created.\n", event->name );
+        }
+        else {
+          printf( "New file %s created.\n", event->name );
+        }
+      }
+      else if ( event->mask & IN_DELETE ) {
+        if ( event->mask & IN_ISDIR ) {
+          printf( "Directory %s deleted.\n", event->name );
+        }
+        else {
+          printf( "File %s deleted.\n", event->name );
+        }
+      }
+    }
+    i += EVENT_SIZE + event->len;
+  }
+  /*removing the “/tmp” directory from the watch list.*/
+   inotify_rm_watch( fd, wd );
+
+  /*closing the INOTIFY instance*/
+   close( fd );
+
+}

tests/makefile

@@ -7,5 +7,7 @@ ioctl: ioctl.c
 
 evtest: evtest.c
 
+inotify: inotify.c
+
 clean:
-	rm *.o parse ioctl 2> /dev/null
+	rm *.o parse ioctl inotify 2> /dev/null