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'\" te
.\" Copyright 1989 AT&T. Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved. Portions Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
.\" http://www.opengroup.org/bookstore/.
.\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
.\" This notice shall appear on any product containing this material.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
.\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.TH realpath 3C "9 Oct 2003" "SunOS 5.11" "Standard C Library Functions"
.SH NAME
realpath \- resolve pathname
.SH SYNOPSIS
.LP
.nf
#include <stdlib.h>
\fBchar *\fR\fBrealpath\fR(\fBconst char *restrict\fR \fIfile_name\fR,
\fBchar *restrict\fR \fIresolved_name\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBrealpath()\fR function derives, from the pathname pointed to by
\fIfile_name\fR, an absolute pathname that names the same file, whose
resolution does not involve "\fB\&.\fR", "\fB\&..\fR", or symbolic links. The
generated pathname is stored as a null-terminated string, up to a maximum of
{\fBPATH_MAX\fR} bytes (defined in \fBlimits.h\fR(3HEAD)), in the buffer
pointed to by \fIresolved_name\fR.
.SH RETURN VALUES
.sp
.LP
On successful completion, \fBrealpath()\fR returns a pointer to the resolved
name. Otherwise, \fBrealpath()\fR returns a null pointer and sets \fBerrno\fR
to indicate the error, and the contents of the buffer pointed to by
\fIresolved_name\fR are left in an indeterminate state.
.SH ERRORS
.sp
.LP
The \fBrealpath()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEACCES\fR\fR
.ad
.RS 16n
.rt
Read or search permission was denied for a component of \fIfile_name\fR.
.RE
.sp
.ne 2
.mk
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 16n
.rt
Either the \fIfile_name\fR or \fIresolved_name\fR argument is a null pointer.
.RE
.sp
.ne 2
.mk
.na
\fB\fBEIO\fR\fR
.ad
.RS 16n
.rt
An error occurred while reading from the file system.
.RE
.sp
.ne 2
.mk
.na
\fB\fBELOOP\fR\fR
.ad
.RS 16n
.rt
Too many symbolic links were encountered in resolving \fIfile_name\fR.
.RE
.sp
.ne 2
.mk
.na
\fB\fBELOOP\fR\fR
.ad
.RS 16n
.rt
A loop exists in symbolic links encountered during resolution of the
\fIfile_name\fR argument.
.RE
.sp
.ne 2
.mk
.na
\fB\fBENAMETOOLONG\fR\fR
.ad
.RS 16n
.rt
The \fIfile_name\fR argument is longer than {\fBPATH_MAX\fR} or a pathname
component is longer than {\fBNAME_MAX\fR}.
.RE
.sp
.ne 2
.mk
.na
\fB\fBENOENT\fR\fR
.ad
.RS 16n
.rt
A component of \fIfile_name\fR does not name an existing file or
\fIfile_name\fR points to an empty string.
.RE
.sp
.ne 2
.mk
.na
\fB\fBENOTDIR\fR\fR
.ad
.RS 16n
.rt
A component of the path prefix is not a directory.
.RE
.sp
.LP
The \fBrealpath()\fR function may fail if:
.sp
.ne 2
.mk
.na
\fB\fBENAMETOOLONG\fR\fR
.ad
.RS 16n
.rt
Pathname resolution of a symbolic link produced an intermediate result whose
length exceeds {\fBPATH_MAX\fR}.
.RE
.sp
.ne 2
.mk
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 16n
.rt
Insufficient storage space is available.
.RE
.SH USAGE
.sp
.LP
The \fBrealpath()\fR function operates on null-terminated strings.
.sp
.LP
Execute permission is required for all the directories in the given and the
resolved path.
.sp
.LP
The \fBrealpath()\fR function might fail to return to the current directory if
an error occurs.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i)
lw(2.75i) |lw(2.75i)
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityStandard
_
MT-LevelMT-Safe
.TE
.SH SEE ALSO
.sp
.LP
\fBgetcwd\fR(3C), \fBlimits.h\fR(3HEAD), \fBsysconf\fR(3C),
\fBattributes\fR(5), \fBstandards\fR(5)
|
