HP-UX Reference (11i v3 07/02) - 2 System Calls (vol 5)

u
umount(2) umount(2)
[ENOTBLK] name is not a block special device.
[ENOTDIR] A component of name is not a directory.
[ENXIO] The device associated with name does not exist.
[EPERM] 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(): SVID2, SVID3, XPG2
HP-UX 11i Version 3: February 2007 − 2 − Hewlett-Packard Company 527