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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 n netipsec/ipsec.h .Ft "const char *" .Fn ipsec_strerror
.Sh DESCRIPTION n netipsec/ipsec.h declares
p .Dl extern int ipsec_errcode;
p which is used to pass an error code from IPsec policy manipulation library to a user program. The .Fn ipsec_strerror function can be used to obtain the error message string for the error code.
p
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 return value from
.Fn ipsec_strerror
and make it invalid.
.Sh RETURN VALUES
The
.Fn ipsec_strerror
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
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.
p .Va ipsec_errcode is not thread safe.