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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2012-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "erl_driver.h"
#ifdef __WIN32__
#include <windows.h>
#else
#include <unistd.h>
#endif
#include <stdio.h>
#include <string.h>
static void stop(ErlDrvData drv_data);
static ErlDrvData start(ErlDrvPort port,
char *command);
static void output(ErlDrvData drv_data,
char *buf, ErlDrvSizeT len);
static ErlDrvSSizeT control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen);
static ErlDrvEntry consume_timeslice_drv_entry = {
NULL /* init */,
start,
stop,
output,
NULL /* ready_input */,
NULL /* ready_output */,
"consume_timeslice_drv",
NULL /* finish */,
NULL /* handle */,
control,
NULL /* timeout */,
NULL /* outputv */,
NULL /* ready_async */,
NULL /* flush */,
NULL /* call */,
NULL /* event */,
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
ERL_DRV_FLAG_USE_PORT_LOCKING,
NULL /* handle2 */,
NULL /* handle_monitor */
};
typedef struct {
ErlDrvPort port;
ErlDrvTermData tport;
ErlDrvTermData cmd_msg[6];
int consume_timeslice;
} consume_timeslice_data_t;
DRIVER_INIT(consume_timeslice_drv)
{
return &consume_timeslice_drv_entry;
}
static void stop(ErlDrvData drv_data)
{
driver_free((void *) drv_data);
}
static ErlDrvData start(ErlDrvPort port,
char *command)
{
consume_timeslice_data_t *ctsd;
ctsd = driver_alloc(sizeof(consume_timeslice_data_t));
if (!ctsd)
return ERL_DRV_ERROR_GENERAL;
ctsd->port = port;
ctsd->tport = driver_mk_port(port);
ctsd->consume_timeslice = 0;
ctsd->cmd_msg[0] = ERL_DRV_PORT;
ctsd->cmd_msg[1] = ctsd->tport;
ctsd->cmd_msg[2] = ERL_DRV_ATOM;
ctsd->cmd_msg[3] = driver_mk_atom("command");
ctsd->cmd_msg[4] = ERL_DRV_TUPLE;
ctsd->cmd_msg[5] = (ErlDrvTermData) 2;
return (ErlDrvData) ctsd;
}
static void output(ErlDrvData drv_data,
char *buf, ErlDrvSizeT len)
{
consume_timeslice_data_t *ctsd = (consume_timeslice_data_t *) drv_data;
int res;
if (ctsd->consume_timeslice) {
int res = erl_drv_consume_timeslice(ctsd->port, 50);
if (res < 0) {
driver_failure_atom(ctsd->port, "erl_drv_consume_timeslice() failed");
return;
}
}
res = erl_drv_output_term(ctsd->tport,
ctsd->cmd_msg,
sizeof(ctsd->cmd_msg)/sizeof(ErlDrvTermData));
if (res <= 0) {
driver_failure_atom(ctsd->port, "erl_drv_output_term() failed");
return;
}
}
static ErlDrvSSizeT control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
consume_timeslice_data_t *ctsd = (consume_timeslice_data_t *) drv_data;
int res;
char *res_str;
ErlDrvSSizeT res_len;
switch (command) {
case 'E':
ctsd->consume_timeslice = 1;
res_str = "enabled";
break;
case 'D':
ctsd->consume_timeslice = 0;
res_str = "disabled";
break;
case 'S':
#ifdef __WIN32__
Sleep((DWORD) 1000);
#else
sleep(1);
#endif
res_str = "sleeped";
break;
default:
res_str = "what?";
break;
}
res_len = strlen(res_str);
if (res_len > rlen) {
char *abuf = driver_alloc(sizeof(char)*res_len);
if (!abuf) {
driver_failure_atom(ctsd->port, "driver_alloc() failed");
return 0;
}
*rbuf = abuf;
}
memcpy((void *) *rbuf, (void *) res_str, res_len);
return res_len;
}
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