2016-09-22 01:58:13 +00:00
|
|
|
/*
|
2017-11-12 16:00:26 +00:00
|
|
|
* (C) 2016 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
|
|
|
|
* Authors: Neels Hofmeyr <nhofmeyr@sysmocom.de>
|
2016-09-22 01:58:13 +00:00
|
|
|
* All Rights Reserved
|
|
|
|
*
|
2017-11-12 16:00:26 +00:00
|
|
|
* SPDX-License-Identifier: GPL-2.0+
|
2016-09-22 01:58:13 +00:00
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*! \addtogroup timer
|
|
|
|
* @{
|
2018-02-28 17:28:53 +00:00
|
|
|
* \file timer_gettimeofday.c
|
|
|
|
* Overriding Time: osmo_gettimeofday()
|
|
|
|
* - Useful to write and reproduce tests that depend on specific time
|
|
|
|
* factors. This API allows to fake the timeval provided by `gettimeofday()`
|
|
|
|
* by using a small shim osmo_gettimeofday().
|
|
|
|
* - If the clock override is disabled (default) for a given clock,
|
|
|
|
* osmo_gettimeofday() will do the same as regular `gettimeofday()`.
|
|
|
|
* - If you want osmo_gettimeofday() to provide a specific time, you must
|
|
|
|
* enable time override by setting the global variable
|
|
|
|
* osmo_gettimeofday_override (`osmo_gettimeofday_override = true`), then
|
|
|
|
* set the global struct timeval osmo_gettimeofday_override_time wih the
|
|
|
|
* desired value. Next time osmo_gettimeofday() is called, it will return
|
|
|
|
* the values previously set.
|
|
|
|
* - A helper osmo_gettimeofday_override_add() is provided to easily
|
|
|
|
* increment osmo_gettimeofday_override_time with a specific amount of
|
|
|
|
* time.
|
|
|
|
*/
|
2016-09-22 01:58:13 +00:00
|
|
|
|
|
|
|
#include <stdbool.h>
|
|
|
|
#include <sys/time.h>
|
2017-06-18 09:41:32 +00:00
|
|
|
#include <osmocom/core/timer_compat.h>
|
2016-09-22 01:58:13 +00:00
|
|
|
|
|
|
|
bool osmo_gettimeofday_override = false;
|
|
|
|
struct timeval osmo_gettimeofday_override_time = { 23, 424242 };
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! shim around gettimeofday to be able to set the time manually.
|
2016-09-22 01:58:13 +00:00
|
|
|
* To override, set osmo_gettimeofday_override == true and set the desired
|
2017-10-20 10:48:04 +00:00
|
|
|
* current time in osmo_gettimeofday_override_time.
|
|
|
|
*
|
|
|
|
* N. B: gettimeofday() is affected by discontinuous jumps in the system time
|
|
|
|
* (e.g., if the system administrator manually changes the system time).
|
|
|
|
* Hence this should NEVER be used for elapsed time computation.
|
2018-02-26 18:42:22 +00:00
|
|
|
* Instead, osmo_clock_gettime() with CLOCK_MONOTONIC should be used for that.
|
2017-10-20 10:48:04 +00:00
|
|
|
*/
|
2016-09-22 01:58:13 +00:00
|
|
|
int osmo_gettimeofday(struct timeval *tv, struct timezone *tz)
|
|
|
|
{
|
|
|
|
if (osmo_gettimeofday_override) {
|
|
|
|
*tv = osmo_gettimeofday_override_time;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return gettimeofday(tv, tz);
|
|
|
|
}
|
|
|
|
|
2017-06-19 22:17:59 +00:00
|
|
|
/*! convenience function to advance the fake time.
|
2016-09-22 01:58:13 +00:00
|
|
|
* Add the given values to osmo_gettimeofday_override_time. */
|
|
|
|
void osmo_gettimeofday_override_add(time_t secs, suseconds_t usecs)
|
|
|
|
{
|
|
|
|
struct timeval val = { secs, usecs };
|
|
|
|
timeradd(&osmo_gettimeofday_override_time, &val,
|
|
|
|
&osmo_gettimeofday_override_time);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*! @} */
|