.\"	$KAME: ipsec_strerror.3,v 1.8 2000/11/20 00:35:14 sakane Exp $
.\"	$FreeBSD: src/lib/libipsec/ipsec_strerror.3,v 1.2.2.5 2001/07/03 11:01:14 ume Exp $
.\"
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.Dd May 6, 1998
.Dt IPSEC_STRERROR 3
.Os
.\"
.Sh NAME
.Nm ipsec_strerror
.Nd error message for IPsec policy manipulation library
.\"
.Sh SYNOPSIS
.Fd #include <netinet6/ipsec.h>
.Ft "const char *"
.Fn ipsec_strerror
.\"
.Sh DESCRIPTION
.Pa 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.
.Fn ipsec_strerror
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
.Fn ipsec_strerror
always return 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
.Fn ipsec_strerror
first appeared in WIDE/KAME IPv6 protocol stack kit.
.\"
.Sh BUGS
.Fn ipsec_strerror
will return its result which may be overwritten by subsequent calls.