freebsd-skq/lib/libipsec/ipsec_strerror.3

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.\" $KAME: ipsec_strerror.3,v 1.9 2001/08/17 07:21:36 itojun Exp $
.\"
.\" Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
.\" All rights reserved.
.\"
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.\" 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.
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" SUCH DAMAGE.
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.\" $FreeBSD$
.\"
.Dd February 14, 2006
.Dt IPSEC_STRERROR 3
.Os
.\"
.Sh NAME
.Nm ipsec_strerror
.Nd error messages for the IPsec policy manipulation library
.\"
.Sh SYNOPSIS
.In netipsec/ipsec.h
.Ft "const char *"
.Fn ipsec_strerror
.\"
.Sh DESCRIPTION
.In netipsec/ipsec.h
declares
.Pp
.Dl extern int ipsec_errcode;
.Pp
which is used to pass an error code from IPsec policy manipulation library
to a user program.
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The
.Fn ipsec_strerror
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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 an underlying function, calling
.Xr strerror 3
after
.Fn ipsec_strerror
would overwrite the the return value from
.Fn ipsec_strerror
and make it invalid.
.\"
.Sh RETURN VALUES
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The
.Fn ipsec_strerror
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function always returns a pointer to C string.
The C string must not be overwritten by the caller.
.\"
.Sh SEE ALSO
.Xr ipsec_set_policy 3
.\"
.Sh HISTORY
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The
.Fn ipsec_strerror
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function first appeared in WIDE/KAME IPv6 protocol stack kit.
.\"
.Sh BUGS
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The
.Fn ipsec_strerror
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function will return its result which may be overwritten by subsequent calls.
.Pp
.Va ipsec_errcode
is not thread safe.