umount - Unmount a file system
char *spec );
System V Compatibility Library (libsys5.a)
Points to the pathname of the special file or file system
to be unmounted.
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.
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.
If the umount() function fails, errno may be set to one of
the following values: The effective user ID of the calling
process is not root. The spec parameter points to a pathname
that does not exist. A component of the path prefix
of spec is not a directory. The device identified by spec
is not a block-special device. The device identified by
spec does not exist. A file on the device pointed to by
the spec parameter is busy. The device pointed to by the
spec parameter is not mounted.
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.
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