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.\" $KAME: ipsec_strerror.3,v 1.9 2001/08/17 07:21:36 itojun Exp $
.\" $FreeBSD$
.\"
.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
.\" 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 project 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 PROJECT 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 PROJECT 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.
.\"
.Dd May 6, 1998
.Dt IPSEC_STRERROR 3
.Os
.\"
.Sh NAME
.Nm ipsec_strerror
.Nd error message for IPsec policy manipulation library
.\"
.Sh SYNOPSIS
.In netinet6/ipsec.h
.Ft "const char *"
.Fn ipsec_strerror
.\"
.Sh DESCRIPTION
.In netinet6/ipsec.h
declares
.Pp
.Dl extern int ipsec_errcode;
.Pp
which is used to pass an error code from IPsec policy manipulation library
to an user program.
The
.Fn ipsec_strerror
function can be used to obtain the error message string for the error code.
.Pp
The array pointed to is not to be modified by the program.
Since
.Fn ipsec_strerror
uses
.Xr strerror 3
as underlying function, calling
.Xr strerror 3
after
.Fn ipsec_strerror
would make the return value from
.Fn ipsec_strerror
invalid, or overwritten.
.\"
.Sh RETURN VALUES
The
.Fn ipsec_strerror
function always returns a pointer to C string.
The C string must not be overwritten by user programs.
.\"
.Sh SEE ALSO
.Xr ipsec_set_policy 3
.\"
.Sh HISTORY
The
.Fn ipsec_strerror
function first appeared in WIDE/KAME IPv6 protocol stack kit.
.\"
.Sh BUGS
The
.Fn ipsec_strerror
function will return its result which may be overwritten by subsequent calls.
.Pp
.Va ipsec_errcode
is not thread safe.
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