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    Command:

    inotify_add_watch

    
    
    

    SYNOPSIS

           #include <sys/inotify.h>
    
           int inotify_add_watch(int fd, const char *pathname, uint32_t mask);
    
    
    

    DESCRIPTION

           inotify_add_watch()  adds  a  new watch, or modifies an existing watch,
           for the file whose location is specified in pathname; the  caller  must
           have read permission for this file.  The fd argument is a file descrip-
           tor referring to the inotify instance whose watch list is to  be  modi-
           fied.   The  events  to  be monitored for pathname are specified in the
           mask bit-mask argument.  See inotify(7) for a description of  the  bits
           that can be set in mask.
    
           A  successful  call  to  inotify_add_watch()  returns  the unique watch
           descriptor associated with pathname  for  this  inotify  instance.   If
           pathname  was  not  previously  being watched by this inotify instance,
           then the watch descriptor is newly allocated.  If pathname was  already
           being  watched, then the descriptor for the existing watch is returned.
    
           The watch descriptor is returned by later  read(2)s  from  the  inotify
           file  descriptor.  These reads fetch inotify_event structures (see ino-
           tify(7)) indicating filesystem events; the watch descriptor inside this
           structure identifies the object for which the event occurred.
    
    
    

    RETURN VALUE

           On success, inotify_add_watch() returns a nonnegative watch descriptor.
           On error, -1 is returned and errno is set appropriately.
    
    
    

    ERRORS

           EACCES Read access to the given file is not permitted.
    
           EBADF  The given file descriptor is not valid.
    
           EFAULT pathname points outside  of  the  process's  accessible  address
                  space.
    
           EINVAL The  given  event mask contains no valid events; or fd is not an
                  inotify file descriptor.
    
           ENOENT A directory component in pathname does not exist or  is  a  dan-
                  gling symbolic link.
    
           ENOMEM Insufficient kernel memory was available.
    
           ENOSPC The  user  limit  on  the  total  number  of inotify watches was
                  reached or the kernel failed to allocate a needed resource.
    
    
    

    VERSIONS

           Inotify was merged into the 2.6.13 Linux kernel.
    
    
    

    CONFORMING TO

    
    
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