/* ``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 AB. Portions
* created by Ericsson are Copyright 2008, Ericsson Utvecklings AB. All
* Rights Reserved.''
*
* $Id$
*/
#ifndef UNIX
#if !defined(__WIN32__)
#define UNIX 1
#endif
#endif
#ifdef UNIX
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef HAVE_POLL_H
# include <poll.h>
#endif
#endif /* UNIX */
#include "erl_driver.h"
typedef struct {
int ofd;
int ifd;
int efd;
#ifdef HAVE_POLL_H
struct erl_drv_event_data edata;
#endif
} mcd_data_t;
static ErlDrvData start(ErlDrvPort port, char *command);
static void stop(ErlDrvData data);
static ErlDrvEntry missing_callback_drv_entry = {
NULL /* init */,
start,
stop,
NULL /* output */,
NULL /* ready_input */,
NULL /* ready_output */,
"missing_callback_drv",
NULL /* finish */,
NULL /* handle */,
NULL /* 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 /* process_exit */
};
DRIVER_INIT(missing_callback_drv)
{
return &missing_callback_drv_entry;
}
static ErlDrvData
start(ErlDrvPort port, char *command)
{
mcd_data_t *mcd = driver_alloc(sizeof(mcd_data_t));
if (!mcd)
goto error;
mcd->ofd = -1;
mcd->ifd = -1;
mcd->efd = -1;
#ifdef UNIX
mcd->ofd = open("/dev/null", O_WRONLY);
if (mcd->ofd < 0)
goto error;
if (driver_select(port, (ErlDrvEvent) (long) mcd->ofd, DO_WRITE, 1) != 0)
goto error;
mcd->ifd = open("/dev/zero", O_RDONLY);
if (mcd->ifd < 0)
goto error;
if (driver_select(port, (ErlDrvEvent) (long) mcd->ifd, DO_READ, 1) != 0)
goto error;
#ifdef HAVE_POLL_H
mcd->efd = open("/dev/null", O_WRONLY);
if (mcd->efd < 0)
goto error;
mcd->edata.events = POLLOUT;
mcd->edata.revents = 0;
driver_event(port, (ErlDrvEvent) (long) mcd->efd, &mcd->edata);
#endif
#endif
driver_set_timer(port, 0);
return (ErlDrvData) mcd;
error:
stop((ErlDrvData) mcd);
return ERL_DRV_ERROR_GENERAL;
}
static void
stop(ErlDrvData data)
{
mcd_data_t *mcd = (mcd_data_t *) data;
if (mcd) {
#ifdef UNIX
if (mcd->ofd >= 0)
close(mcd->ofd);
if (mcd->ifd >= 0)
close(mcd->ifd);
#ifdef HAVE_POLL_H
if (mcd->efd >= 0)
close(mcd->efd);
#endif
#endif
driver_free(mcd);
}
}
