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umount(3)
NAME
  umount - Unmount a file system

SYNOPSIS
  #include <sys/mount.h>

  int unmount(
	  char *spec );

LIBRARY
  System V Compatibility Library (libsys5.a)

PARAMETERS
  spec
      Points to the pathname of the special file or file system to be
      unmounted.

DESCRIPTION
  The umount() function unmounts a previously-mounted file system contained
  on the block special file pointed to by the spec parameter. When the file
  system is unmounted, the directory mount point where the file system was
  mounted returns to its normal interpretation.

  The umount() function can only be invoked by the superuser.

NOTES
  Two umount() functions are supported by the Tru64 UNIX operating system:
  the BSD umount() and the System V umount(). The default umount() function
  is the BSD umount() . To use the version of umount() documented on this
  reference page, you must link with the libsys5 library before you link with
  libc.

ERRORS
  If the umount() function fails, errno may be set to one of the following
  values:

  [EPERM]
      The effective user ID of the calling process is not root.

  [ENOENT]
      The spec parameter points to a pathname that does not exist.

  [ENOTDIR]
      A component of the path prefix of spec is not a directory.

  [ENOTBLK]
      The device identified by spec is not a block-special device.

  [ENXIO]
      The device identified by spec does not exist.

  [EBUSY]
      A file on the device pointed to by the spec parameter is busy.

  [EINVAL]
      The device pointed to by the spec parameter is not mounted.

RETURN VALUE
  The umount() function returns 0 (zero) if the file system was successfully
  unmounted. Otherwise, -1 is returned and errno is set to indicate the
  error.

SEE ALSO
  Commands: mount(8)

Index for Section 3

Alphabetical listing for U

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