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.\" $Id$
.\"
.\" Copyright (c) 2001, 2003, 2006 Kungliga Tekniska Högskolan
.\" (Royal Institute of Technology, Stockholm, Sweden).
.\" 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
.\"
.\" $Id$
.\"
.Dd September 16, 2006
.Dt KRB5_TIMEOFDAY 3
.Os HEIMDAL
.Sh NAME
.Nm krb5_timeofday ,
.Nm krb5_set_real_time ,
.Nm krb5_us_timeofday ,
.Nm krb5_format_time ,
.Nm krb5_string_to_deltat
.Nd Kerberos 5 time handling functions
.Sh LIBRARY
Kerberos 5 Library (libkrb5, -lkrb5)
.Sh SYNOPSIS
.In krb5.h
.Pp
.Li krb5_timestamp ;
.Pp
.Li krb5_deltat ;
.Ft krb5_error_code
.Fo krb5_set_real_time
.Fa "krb5_context context"
.Fa "krb5_timestamp sec"
.Fa "int32_t usec"
.Fc
.Ft krb5_error_code
.Fo krb5_timeofday
.Fa "krb5_context context"
.Fa "krb5_timestamp *timeret"
.Fc
.Ft krb5_error_code
.Fo krb5_us_timeofday
.Fa "krb5_context context"
.Fa "krb5_timestamp *sec"
.Fa "int32_t *usec"
.Fc
.Ft krb5_error_code
.Fo krb5_format_time
.Fa "krb5_context context"
.Fa "time_t t"
.Fa "char *s"
.Fa "size_t len"
.Fa "krb5_boolean include_time"
.Fc
.Ft krb5_error_code
.Fo krb5_string_to_deltat
.Fa "const char *string"
.Fa "krb5_deltat *deltat"
.Fc
.Sh DESCRIPTION
.Nm krb5_set_real_time
sets the absolute time that the caller knows the KDC has.
With this the Kerberos library can calculate the relative
difference between the KDC time and the local system time and store it
in the
.Fa context .
With this information the Kerberos library can adjust all time stamps
in Kerberos packages.
.Pp
.Fn krb5_timeofday
returns the current time, but adjusted with the time difference
between the local host and the KDC.
.Fn krb5_us_timeofday
also returns microseconds.
.Pp
.Nm krb5_format_time
formats the time
.Fa t
into the string
.Fa s
of length
.Fa len .
If
.Fa include_time
is set, the time is set include_time.
.Pp
.Nm krb5_string_to_deltat
parses delta time
.Fa string
into
.Fa deltat .
.Sh SEE ALSO
.Xr gettimeofday 2 ,
.Xr krb5 3
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