1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
120 lines
4.1 KiB
Groff
120 lines
4.1 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)unlink.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt UNLINK 2
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.Os BSD 4
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.Sh NAME
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.Nm unlink
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.Nd remove directory entry
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.Sh SYNOPSIS
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.Fd #include <unistd.h>
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.Ft int
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.Fn unlink "const char *path"
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.Sh DESCRIPTION
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The
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.Fn unlink
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function
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removes the link named by
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.Fa path
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from its directory and decrements the link count of the
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file which was referenced by the link.
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If that decrement reduces the link count of the file
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to zero,
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and no process has the file open, then
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all resources associated with the file are reclaimed.
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If one or more process have the file open when the last link is removed,
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the link is removed, but the removal of the file is delayed until
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all references to it have been closed.
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.Fa path
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may not be a directory.
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned.
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Otherwise, a value of -1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn unlink
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succeeds unless:
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.Bl -tag -width ENAMETOOLONGAA
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters,
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or an entire path name exceeded 1023 characters.
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.It Bq Er ENOENT
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The named file does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix.
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.It Bq Er EACCES
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Write permission is denied on the directory containing the link
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to be removed.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EPERM
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The named file is a directory.
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.It Bq Er EPERM
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The directory containing the file is marked sticky,
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and neither the containing directory nor the file to be removed
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are owned by the effective user ID.
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.It Bq Er EBUSY
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The entry to be unlinked is the mount point for a
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mounted file system.
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.It Bq Er EIO
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An I/O error occurred while deleting the directory entry
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or deallocating the inode.
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.It Bq Er EROFS
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The named file resides on a read-only file system.
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.It Bq Er EFAULT
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.Fa Path
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points outside the process's allocated address space.
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.El
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.Sh SEE ALSO
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.Xr close 2 ,
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.Xr link 2 ,
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.Xr rmdir 2 ,
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.Xr symlink 7
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.Sh HISTORY
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An
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.Fn unlink
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function call appeared in
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.At v6 .
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.Pp
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The
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.Fn unlink
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system call traditionally allows the super-user to unlink directories which
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can damage the filesystem integrity. This implementation no longer permits
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it.
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