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.\" Copyright (c) 2016 The FreeBSD Foundation. All rights reserved.
.\"
.\" This documentation was written by Ed Maste under sponsorship of
.\" the FreeBSD Foundation.
.\"
.\" 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.
.\"
.\" This software is provided by the author 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 author 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 August 24, 2016
.Os
.Dt ELFTC_TIMESTAMP 3
.Sh NAME
.Nm elftc_timestamp
.Nd return the current or environment-provided timestamp
.Sh LIBRARY
.Lb libelftc
.Sh SYNOPSIS
.In libelftc.h
.Ft int
.Fo elftc_timestamp
.Fa "time_t *timestamp"
.Fc
.Sh DESCRIPTION
The
.Fn elftc_timestamp
function returns a timestamp supplied by the
.Ev SOURCE_DATE_EPOCH
environment variable, or the current time provided by
.Xr time 3
if the environment variable is not set.
.Pp
The
.Ar timestamp
argument specifies a pointer to the location where the timestamp will be
stored.
.Sh RETURN VALUE
Function
.Fn elftc_timestamp
returns 0 on success, and -1 in the event of an error.
.Sh ERRORS
The
.Fn elftc_timestamp
function may fail with the following errors:
.Bl -tag -width ".Bq Er ERANGE"
.It Bq Er EINVAL
.Ev SOURCE_DATE_EPOCH
contains invalid characters.
.It Bq Er ERANGE
.Ev SOURCE_DATE_EPOCH
specifies a negative value or a value that cannot be stored in a
time_t.
.El
The
.Fn elftc_timestamp
function may also fail for any of the reasons described in
.Xr strtoll 3 .
.Sh SEE ALSO
.Xr strtoll 3 ,
.Xr time 3
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