umount(2)							System Calls Manual							 umount(2)

NAME

       umount(), umount2() - unmount a file system

SYNOPSIS


DESCRIPTION

       requests that a previously mounted file system contained on the block special device identified by name be unmounted.

       requests  that  a  previously  mounted  file  system  contained	on  the block special device identified by name be unmounted in the manner
       described in flags.

       name is a pointer to a path name.

       flags is a bitmask of flags, specified in that are combined to describe the type of unmount to be performed.  Valid flags are:

	      perform a normal unmount

	      perform a forced unmount

       MS_NORMAL and MS_FORCE are mutually exclusive.

       A forced unmount is one which will occur regardless of activity on the file system.

       After unmounting the file system, the directory upon which the file system was mounted reverts to its ordinary interpretation.

       and can also request that a file system mounted previously on the directory identified by name be unmounted.   After  unmounting  the  file
       system, name reverts to its ordinary interpretation.

       and can be invoked only by the user with the appropriate privilege.

NETWORKING FEATURES

   NFS
       path must indicate a directory name when unmounting an NFS file system.

RETURN VALUE

       If successful, and return a value of Otherwise, they return a value of -1 and set to indicate the error.

ERRORS

       and fail if one or more of the following are true:

       A component of the path prefix of
		      name denies search permission.

       A file on      name is busy.

       name	      points outside the allocated address space of the process.  Reliable detection of this error is implementation dependent.

       name	      is not mounted.

       flags	      is not a valid combination of flags.

       Too many symbolic links were encountered in translating the path
		      name.

       name	      exceeds bytes, or a component of name exceeds bytes while is in effect.

       name	      does not exist.

       name	      is null.

       A forced unmount was requested on a file system that does not
		      support it.

       name	      is not a block special device.

       A component of name is not a directory.

       The device associated with
		      name does not exist.

       The effective user ID of the process
		      is not that of a user with appropriate privileges.

SEE ALSO

       mount(1M), mount(2), privileges(5).

STANDARDS CONFORMANCE

																	 umount(2)