mirror of https://github.com/mkerrisk/man-pages
114 lines
3.9 KiB
Groff
114 lines
3.9 KiB
Groff
.\" Copyright (c) 1983, 1991 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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.
|
|
.\"
|
|
.\" @(#)readlink.2 6.8 (Berkeley) 3/10/91
|
|
.\"
|
|
.\" Modified Sat Jul 24 00:10:21 1993 by Rik Faith (faith@cs.unc.edu)
|
|
.\" Modified Tue Jul 9 23:55:17 1996 by aeb
|
|
.\" Modified Fri Jan 24 00:26:00 1997 by aeb
|
|
.\"
|
|
.TH READLINK 2 1997-08-21 "Linux 2.0.30" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
readlink \- read value of a symbolic link
|
|
.SH SYNOPSIS
|
|
.B #include <unistd.h>
|
|
.sp
|
|
.BI "int readlink(const char *" path ", char *" buf ", size_t " bufsiz );
|
|
.\" FIXME . In 2005-04-01, the return type was changed to the
|
|
.\" the POSIX compliant 'size_t'. When this is actually released
|
|
.\" we should udate the above prototype and add a NOTE about the
|
|
.\" variation across glibc versions.
|
|
.\" See http://sourceware.org/bugzilla/show_bug.cg1?id=2450
|
|
.\"
|
|
.SH DESCRIPTION
|
|
.BR readlink ()
|
|
places the contents of the symbolic link
|
|
.I path
|
|
in the buffer
|
|
.IR buf ,
|
|
which has size
|
|
.IR bufsiz .
|
|
.BR readlink ()
|
|
does not append a null byte to
|
|
.IR buf .
|
|
It will truncate the contents (to a length of
|
|
.I bufsiz
|
|
characters), in case the buffer is too small to hold all of the contents.
|
|
.SH "RETURN VALUE"
|
|
The call returns the count of characters placed in the buffer
|
|
if it succeeds, or a \-1 if an error occurs, placing the error
|
|
code in
|
|
.IR errno .
|
|
.SH ERRORS
|
|
.TP
|
|
.B EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
(See also
|
|
.BR path_resolution (2).)
|
|
.TP
|
|
.B EFAULT
|
|
.I buf
|
|
extends outside the process's allocated address space.
|
|
.TP
|
|
.B EINVAL
|
|
.I bufsiz
|
|
is not positive.
|
|
.TP
|
|
.B EINVAL
|
|
The named file is not a symbolic link.
|
|
.TP
|
|
.B EIO
|
|
An I/O error occurred while reading from the file system.
|
|
.TP
|
|
.B ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.TP
|
|
.B ENAMETOOLONG
|
|
A pathname, or a component of a pathname, was too long.
|
|
.TP
|
|
.B ENOENT
|
|
The named file does not exist.
|
|
.TP
|
|
.B ENOMEM
|
|
Insufficient kernel memory was available.
|
|
.TP
|
|
.B ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.SH "CONFORMING TO"
|
|
X/OPEN, 4.4BSD (the
|
|
.BR readlink ()
|
|
function call appeared in 4.2BSD).
|
|
.SH "SEE ALSO"
|
|
.BR lstat (2),
|
|
.BR path_resolution (2),
|
|
.BR stat (2),
|
|
.BR symlink (2)
|