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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.''
*
* $Id$
*/
#ifndef UNIX
#if !defined(__WIN32__)
#define UNIX 1
#endif
#endif
#include <stdio.h>
#include <string.h>
#ifdef UNIX
#include <unistd.h>
#endif
#include "erl_driver.h"
typedef struct {
ErlDrvPort port;
int fds[2];
} IOReadyExitDrvData;
static ErlDrvData io_ready_exit_drv_start(ErlDrvPort, char *);
static void io_ready_exit_drv_stop(ErlDrvData);
static void io_ready_exit_ready_input(ErlDrvData, ErlDrvEvent);
static void io_ready_exit_ready_output(ErlDrvData, ErlDrvEvent);
static void io_ready_exit_drv_output(ErlDrvData, char *, int);
static void io_ready_exit_drv_finish(void);
static ErlDrvSSizeT io_ready_exit_drv_control(ErlDrvData, unsigned int,
char *, ErlDrvSizeT,
char **, ErlDrvSizeT);
static ErlDrvEntry io_ready_exit_drv_entry = {
NULL, /* init */
io_ready_exit_drv_start,
io_ready_exit_drv_stop,
NULL /* output */,
io_ready_exit_ready_input,
io_ready_exit_ready_output,
"io_ready_exit_drv",
NULL /* finish */,
NULL, /* handle */
io_ready_exit_drv_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,
0, /* ERL_DRV_FLAGs */
NULL, /* handle2 */
NULL, /* process_exit */
NULL /* stop_select */
};
/* -------------------------------------------------------------------------
** Entry functions
**/
DRIVER_INIT(io_ready_exit_drv)
{
return &io_ready_exit_drv_entry;
}
static ErlDrvData
io_ready_exit_drv_start(ErlDrvPort port, char *command) {
IOReadyExitDrvData *oeddp = driver_alloc(sizeof(IOReadyExitDrvData));
oeddp->port = port;
oeddp->fds[0] = -1;
oeddp->fds[1] = -1;
return (ErlDrvData) oeddp;
}
static void
io_ready_exit_drv_stop(ErlDrvData drv_data) {
IOReadyExitDrvData *oeddp = (IOReadyExitDrvData *) drv_data;
#ifdef UNIX
if (oeddp->fds[0] >= 0) {
driver_select(oeddp->port,
(ErlDrvEvent) (ErlDrvSInt) oeddp->fds[0],
DO_READ|DO_WRITE,
0);
close(oeddp->fds[0]);
}
if (oeddp->fds[1] >= 0)
close(oeddp->fds[1]);
#endif
driver_free((void *) oeddp);
}
static void
io_ready_exit_ready_output(ErlDrvData drv_data, ErlDrvEvent event)
{
IOReadyExitDrvData *oeddp = (IOReadyExitDrvData *) drv_data;
driver_failure_atom(oeddp->port, "ready_output_driver_failure");
}
static void
io_ready_exit_ready_input(ErlDrvData drv_data, ErlDrvEvent event)
{
IOReadyExitDrvData *oeddp = (IOReadyExitDrvData *) drv_data;
driver_failure_atom(oeddp->port, "ready_input_driver_failure");
}
static ErlDrvSSizeT
io_ready_exit_drv_control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
char *abuf;
char *res_str;
ErlDrvSSizeT res_len;
IOReadyExitDrvData *oeddp = (IOReadyExitDrvData *) drv_data;
#ifndef UNIX
res_str = "nyiftos";
#else
if (pipe(oeddp->fds) < 0) {
res_str = "pipe failed";
}
else {
res_str = "ok";
(void) write(oeddp->fds[1], "!", 1);
driver_select(oeddp->port,
(ErlDrvEvent) (ErlDrvSInt) oeddp->fds[0],
DO_READ|DO_WRITE,
1);
}
#endif
res_len = strlen(res_str);
if (res_len > rlen) {
abuf = driver_alloc(sizeof(char)*res_len);
if (!abuf)
return 0;
*rbuf = abuf;
}
memcpy((void *) *rbuf, (void *) res_str, res_len);
return res_len;
}
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