b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
121 lines
3.9 KiB
Groff
121 lines
3.9 KiB
Groff
.\" $NetBSD: unlink.2,v 1.23 2010/05/31 12:16:20 njoly Exp $
|
|
.\"
|
|
.\" Copyright (c) 1980, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)unlink.2 8.1 (Berkeley) 6/4/93
|
|
.\"
|
|
.Dd April 3, 2010
|
|
.Dt UNLINK 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm unlink
|
|
.Nd remove directory entry
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fn unlink "const char *path"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn unlink
|
|
function
|
|
removes the link named by
|
|
.Fa path
|
|
from its directory and decrements the link count of the
|
|
file which was referenced by the link.
|
|
If that decrement reduces the link count of the file
|
|
to zero,
|
|
and no process has the file open, then
|
|
all resources associated with the file are reclaimed.
|
|
If one or more process have the file open when the last link is removed,
|
|
the link is removed, but the removal of the file is delayed until
|
|
all references to it have been closed.
|
|
.Sh RETURN VALUES
|
|
Upon successful completion, a value of 0 is returned.
|
|
Otherwise, a value of \-1 is returned and
|
|
.Va errno
|
|
is set to indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn unlink
|
|
succeeds unless:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix, or
|
|
write permission is denied on the directory containing the link
|
|
to be removed.
|
|
.It Bq Er EBUSY
|
|
The entry to be unlinked is the mount point for a
|
|
mounted file system.
|
|
.It Bq Er EFAULT
|
|
.Fa path
|
|
points outside the process's allocated address space.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while deleting the directory entry
|
|
or deallocating the inode.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of a pathname exceeded
|
|
.Brq Dv NAME_MAX
|
|
characters, or an entire path name exceeded
|
|
.Brq Dv PATH_MAX
|
|
characters.
|
|
.It Bq Er ENOENT
|
|
The named file does not exist.
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.It Bq Er EPERM
|
|
The named file is a directory and the effective user ID
|
|
of the process is not the super-user, the file system
|
|
containing the file does not permit the use of
|
|
.Fn unlink
|
|
on a directory,
|
|
or the directory containing the file is marked sticky,
|
|
and neither the containing directory nor the file to be removed
|
|
are owned by the effective user ID.
|
|
.It Bq Er EROFS
|
|
The named file resides on a read-only file system.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr close 2 ,
|
|
.Xr link 2 ,
|
|
.Xr rmdir 2 ,
|
|
.Xr symlink 7
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn unlink
|
|
function conforms to
|
|
.St -p1003.1-90 .
|
|
.Sh HISTORY
|
|
An
|
|
.Fn unlink
|
|
function call appeared in
|
|
.At v2 .
|