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/*
* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Authors: Pau Espin Pedrol <pespin@sysmocom.de>
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/*! \addtogroup timer
* @{
* \file timer_clockgettime.c
* Overriding Time: osmo_clock_gettime()
* - Useful to write and reproduce tests that depend on specific time
* factors. This API allows to fake the timespec provided by `clock_gettime()`
* by using a small shim osmo_clock_gettime().
* - Choose the clock you want to override, for instance CLOCK_MONOTONIC.
* - If the clock override is disabled (default) for a given clock,
* osmo_clock_gettime() will do the same as regular `clock_gettime()`.
* - If you want osmo_clock_gettime() to provide a specific time, you must
* enable time override with osmo_clock_override_enable(),
* then set a pointer to the timespec storing the fake time for that
* specific clock (`struct timespec *ts =
* osmo_clock_override_gettimespec()`) and set it as
* desired. Next time osmo_clock_gettime() is called, it will return the
* values previously set through the ts pointer.
* - A helper osmo_clock_override_add() is provided to increment a given
* overriden clock with a specific amount of time.
*/
/*! \file timer_clockgettime.c
*/
#include <stdlib.h>
#include <stdbool.h>
#include <sys/time.h>
#include <time.h>
#include <osmocom/core/timer_compat.h>
/*! An internal structure to handle overriden time for each clock type. */
struct fakeclock {
bool override;
struct timespec time;
};
static struct fakeclock realtime;
static struct fakeclock realtime_coarse;
static struct fakeclock mono;
static struct fakeclock mono_coarse;
static struct fakeclock mono_raw;
static struct fakeclock boottime;
static struct fakeclock boottime;
static struct fakeclock proc_cputime_id;
static struct fakeclock th_cputime_id;
static struct fakeclock* clkid_to_fakeclock(clockid_t clk_id)
{
switch(clk_id) {
case CLOCK_REALTIME:
return &realtime;
case CLOCK_REALTIME_COARSE:
return &realtime_coarse;
case CLOCK_MONOTONIC:
return &mono;
case CLOCK_MONOTONIC_COARSE:
return &mono_coarse;
case CLOCK_MONOTONIC_RAW:
return &mono_raw;
case CLOCK_BOOTTIME:
return &boottime;
case CLOCK_PROCESS_CPUTIME_ID:
return &proc_cputime_id;
case CLOCK_THREAD_CPUTIME_ID:
return &th_cputime_id;
default:
return NULL;
}
}
/*! Shim around clock_gettime to be able to set the time manually.
*
* To override, use osmo_clock_override_enable and set the desired
* current time with osmo_clock_gettimespec. */
int osmo_clock_gettime(clockid_t clk_id, struct timespec *tp)
{
struct fakeclock* c = clkid_to_fakeclock(clk_id);
if (!c || !c->override)
return clock_gettime(clk_id, tp);
*tp = c->time;
return 0;
}
/*! Convenience function to enable or disable a specific clock fake time.
*/
void osmo_clock_override_enable(clockid_t clk_id, bool enable)
{
struct fakeclock* c = clkid_to_fakeclock(clk_id);
if (c)
c->override = enable;
}
/*! Convenience function to return a pointer to the timespec handling the
* fake time for clock clk_id. */
struct timespec *osmo_clock_override_gettimespec(clockid_t clk_id)
{
struct fakeclock* c = clkid_to_fakeclock(clk_id);
if (c)
return &c->time;
return NULL;
}
/*! Convenience function to advance the fake time.
*
* Adds the given values to the clock time. */
void osmo_clock_override_add(clockid_t clk_id, time_t secs, long nsecs)
{
struct timespec val = { secs, nsecs };
struct fakeclock* c = clkid_to_fakeclock(clk_id);
if (c)
timespecadd(&c->time, &val, &c->time);
}
/*! @} */
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