2.9BSD/usr/man/man2/unlink.2

.TH UNLINK 2 
.UC
.SH NAME
unlink \- remove directory entry
.SH SYNOPSIS
.B unlink(name)
.br
.B char *name;
.SH DESCRIPTION
.I Unlink
removes the entry for the file pointed to by
.I name
from its directory.
If this entry was the last link to the file,
the contents of the file are freed and the file is destroyed.
If, however, the file was open in any process, the actual
destruction is delayed until it is closed, even though
the directory entry has disappeared.
.SH ERRORS
.I Unlink
will succeed unless:
.TP 20
[EINVAL]
The path name contains a non-ASCII byte.
.TP 20
[ENOTDIR]
A component of the path prefix is not a directory.
.TP 20
[ENOENT]
The named file does not exist.
.TP 20
[EACCES]
Search permission is denied for a component of the path prefix.
.TP 20
[EACCES]
Write permission is denied on the directory containing the link to be removed.
.TP 20
[EPERM]
The named file is a directory and the process's effective user ID
is not the super-user.
.TP 20
[EBUSY]
The entry to be unlinked is the mount point for a mounted file system.
.TP 20
[EROFS]
The named file resides on a read-only file system.
.TP 20
[EFAULT]
.I Name
points to an address outside the process's allocated address space.
.TP 20
[ELOOP]
Too many symbolic links were encountered in translating the path name.
.SH "SEE ALSO"
rm(1), link(2)
.SH ASSEMBLER
(unlink = 10.)
.br
.B sys  unlink; name