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/* ``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.
*
* The Initial Developer of the Original Code is Ericsson Utvecklings AB.
* Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
* AB. All Rights Reserved.''
*
* $Id$
*/
#include <stdlib.h>
#include <string.h>
#include "erl_driver.h"
static ErlDrvData start(ErlDrvPort port,
char *command);
static void output(ErlDrvData drv_data,
char *buf, ErlDrvSizeT len);
static void outputv(ErlDrvData drv_data,
ErlIOVec *ev);
static ErlDrvSSizeT control(ErlDrvData drv_data,
unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen);
static ErlDrvSSizeT call(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen,
unsigned int *flags);
static ErlDrvEntry caller_drv_entry = {
NULL /* init */,
start,
NULL /* stop */,
output,
NULL /* ready_input */,
NULL /* ready_output */,
"caller_drv",
NULL /* finish */,
NULL /* handle */,
control,
NULL /* timeout */,
outputv,
NULL /* ready_async */,
NULL /* flush */,
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 */
};
DRIVER_INIT(caller_drv)
{
char buf[10];
size_t bufsz = sizeof(buf);
char *use_outputv;
use_outputv = (erl_drv_getenv("CALLER_DRV_USE_OUTPUTV", buf, &bufsz) == 0
? buf
: "false");
if (strcmp(use_outputv, "true") != 0)
caller_drv_entry.outputv = NULL;
return &caller_drv_entry;
}
void
send_caller(ErlDrvData drv_data, char *func)
{
int res;
ErlDrvPort port = (ErlDrvPort) drv_data;
ErlDrvTermData msg[] = {
ERL_DRV_ATOM, driver_mk_atom("caller"),
ERL_DRV_PORT, driver_mk_port(port),
ERL_DRV_ATOM, driver_mk_atom(func),
ERL_DRV_PID, driver_caller(port),
ERL_DRV_TUPLE, (ErlDrvTermData) 4
};
res = erl_drv_output_term(driver_mk_port(port), msg, sizeof(msg)/sizeof(ErlDrvTermData));
if (res <= 0)
driver_failure_atom(port, "erl_drv_output_term failed");
}
static ErlDrvData
start(ErlDrvPort port, char *command)
{
send_caller((ErlDrvData) port, "start");
return (ErlDrvData) port;
}
static void
output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len)
{
send_caller(drv_data, "output");
}
static void
outputv(ErlDrvData drv_data, ErlIOVec *ev)
{
send_caller(drv_data, "outputv");
}
static ErlDrvSSizeT
control(ErlDrvData drv_data,
unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
{
send_caller(drv_data, "control");
return 0;
}
static ErlDrvSSizeT
call(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen,
unsigned int *flags)
{
/* echo call */
if (len > rlen)
*rbuf = driver_alloc(len);
memcpy((void *) *rbuf, (void *) buf, len);
send_caller(drv_data, "call");
return len;
}
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