tor-android/external/badvpn_dns/ncd/modules/timer.c

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2015-01-25 11:08:34 +00:00
/**
* @file timer.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* 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 author 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 COPYRIGHT HOLDERS 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 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.
*
* @section DESCRIPTION
*
* Synopsis:
* periodic_timer(string down_time, string up_time)
*
* Description:
* Periodically goes up and down. Starting in the down state, waits 'down_time'
* milliseconds. Then it goes up, and after 'up_time' milliseconds, goes back down,
* and the process repeats. When requested to terminate, terminates immedietely.
*/
#include <stddef.h>
#include <misc/debug.h>
#include <ncd/NCDModule.h>
#include <ncd/extra/value_utils.h>
#include <generated/blog_channel_ncd_timer.h>
#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
#define STATE_DOWN 1
#define STATE_UP 2
struct instance {
NCDModuleInst *i;
btime_t down_time;
btime_t up_time;
BTimer timer;
int state;
};
static void timer_handler (void *vo)
{
struct instance *o = vo;
switch (o->state) {
case STATE_DOWN: {
o->state = STATE_UP;
BReactor_SetTimerAfter(o->i->params->iparams->reactor, &o->timer, o->up_time);
NCDModuleInst_Backend_Up(o->i);
} break;
case STATE_UP: {
o->state = STATE_DOWN;
BReactor_SetTimerAfter(o->i->params->iparams->reactor, &o->timer, o->down_time);
NCDModuleInst_Backend_Down(o->i);
} break;
default: ASSERT(0);
}
}
static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
struct instance *o = vo;
o->i = i;
// check arguments
NCDValRef down_time_arg;
NCDValRef up_time_arg;
if (!NCDVal_ListRead(params->args, 2, &down_time_arg, &up_time_arg)) {
ModuleLog(o->i, BLOG_ERROR, "wrong arity");
goto fail0;
}
if (!NCDVal_IsString(down_time_arg) || !NCDVal_IsString(up_time_arg)) {
ModuleLog(o->i, BLOG_ERROR, "wrong type");
goto fail0;
}
// read times
if (!ncd_read_time(down_time_arg, &o->down_time)) {
ModuleLog(o->i, BLOG_ERROR, "wrong down time");
goto fail0;
}
if (!ncd_read_time(up_time_arg, &o->up_time)) {
ModuleLog(o->i, BLOG_ERROR, "wrong up time");
goto fail0;
}
// init timer
BTimer_Init(&o->timer, 0, timer_handler, o);
// set state down
o->state = STATE_DOWN;
// set timer
BReactor_SetTimerAfter(o->i->params->iparams->reactor, &o->timer, o->down_time);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void func_die (void *vo)
{
struct instance *o = vo;
// free timer
BReactor_RemoveTimer(o->i->params->iparams->reactor, &o->timer);
NCDModuleInst_Backend_Dead(o->i);
}
static struct NCDModule modules[] = {
{
.type = "periodic_timer",
.func_new2 = func_new,
.func_die = func_die,
.alloc_size = sizeof(struct instance)
}, {
.type = NULL
}
};
const struct NCDModuleGroup ncdmodule_timer = {
.modules = modules
};