NAME

unmount − remove a file system

SYNOPSIS

unmount(name)
char ∗name;

DESCRIPTION

Unmount announces to the system that the directory name is no longer to refer to the root of a mounted file system.  The directory name reverts to its ordinary interpretation. 

RETURN VALUE

Unmount returns 0 if it was able to remove the file system successfully.  It returns −1 if the directory is inaccessible or does not have a mounted file system.  It also returns −1 if there are active files in the mounted file system. 

ERRORS

Unmount may fail with one of the following errors:

[EPERM] The caller is not the super-user. 

[EINVAL] Name is not the root of a mounted file system. 

[EBUSY] A process is holding a reference to a file located on the file system. 

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

[EPERM] The pathname contains a character with the high-order bit set. 

[ENAMETOOLONG]
The pathname was too long.

[ENOENT] name does not exist. 

[EACCES] Search permission is denied for a component of the path prefix. 

[EFAULT] name points outside the process’s allocated address space. 

[ELOOP] Too many symbolic links were encountered in translating the pathname. 

[EIO] An I/O error occurred while reading from or writing to the file system. 

SEE ALSO

mount(2), mount(8), umount(8)

BUGS

The error codes are in a state of disarray.  Too many errors appear to the caller as one value. 

INTEGRATED SOLUTIONS 4.3 BSD  —  19 August 1985