NFSv2/usr/man/man2/unmount.2

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.\" @(#)unmount.2 1.2 85/04/04 SMI; from UCB 4.2
.TH UNMOUNT 2 "1 February 1985"
.SH NAME
unmount \- remove a file system
.SH SYNOPSIS
.nf
.ft B
unmount(name)
char *name;
.fi
.IX  unmount  ""  \fLunmount\fP
.IX  "file system"  unmount  ""  \fLunmount\fP
.IX  "remove file system"
.IX  "demount file system"
.SH DESCRIPTION
.I Unmount
announces to the system that the directory
.I name
is no longer to refer to the root of a mounted file system.
The directory
.I name
reverts to its ordinary interpretation.
.SH "RETURN VALUE
.I Unmount
returns 0 if the action occurred; \-1 if
if the directory is inaccessible or
does not have a mounted file system,
or if there are active files in the mounted 
file system.
.SH ERRORS
.I Unmount
may fail with one of the following errors:
.TP 15
[EINVAL]
The caller is not the super-user.
.TP 15
[EINVAL]
.I Name
is not the root of a mounted file system.
.TP 15
[EBUSY]
A process is holding a reference to a file located
on the file system.
.SH "SEE ALSO"
mount(2), mount(8), umount(8)
.SH BUGS
The error codes are in a state of disarray; too many errors
appear to the caller as one value.