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/* ``The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved via the world wide web at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights 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__) && !defined(VXWORKS)
#define UNIX 1
#endif
#endif
/* We actually only want to run this on
Unix machines which have the usleep call */
#if defined(UNIX) && !defined(HAVE_USLEEP)
#undef UNIX
#endif
#ifdef UNIX
#include <errno.h>
#include <stdio.h>
#include <stdlib.h> /* rand */
#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"
static int slow_drv_init(void);
static void slow_drv_finish(void);
static ErlDrvData slow_drv_start(ErlDrvPort, char *);
static void slow_drv_stop(ErlDrvData);
static void slow_drv_ready_input(ErlDrvData, ErlDrvEvent);
static ErlDrvSSizeT slow_drv_control(ErlDrvData, unsigned int,
char *, ErlDrvSizeT, char **, ErlDrvSizeT);
static ErlDrvEntry slow_drv_entry = {
slow_drv_init,
slow_drv_start,
slow_drv_stop,
NULL, /* output */
slow_drv_ready_input,
NULL, /* ready_output */
"slow_drv",
slow_drv_finish,
NULL, /* handle */
slow_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,
ERL_DRV_FLAG_USE_PORT_LOCKING,
NULL,/* void *handle2 */
NULL,/* process_exit */
NULL /* stop select */
};
typedef struct {
ErlDrvPort port;
ErlDrvTermData id;
int test;
int s[2];
} SlowDrvData;
/* -------------------------------------------------------------------------
** Entry functions
**/
DRIVER_INIT(slow_drv)
{
return &slow_drv_entry;
}
static int
slow_drv_init(void)
{
return 0;
}
static void
slow_drv_finish(void)
{
}
static ErlDrvData
slow_drv_start(ErlDrvPort port, char *command)
{
#ifndef UNIX
return NULL;
#else
SlowDrvData *sddp = driver_alloc(sizeof(SlowDrvData));
if (!sddp) {
errno = ENOMEM;
return ERL_DRV_ERROR_ERRNO;
}
sddp->port = port;
sddp->id = driver_mk_port(port);
sddp->test = 0;
sddp->s[0] = sddp->s[1] = -1;
return (ErlDrvData) sddp;
#endif
}
static void
slow_drv_stop(ErlDrvData drv_data) {
#ifdef UNIX
SlowDrvData *sddp = (SlowDrvData *) drv_data;
if (sddp->test) {
driver_select(sddp->port, (ErlDrvEvent) (ErlDrvSInt) sddp->s[0], DO_READ, 0);
close(sddp->s[0]);
close(sddp->s[1]);
}
driver_free((void *) sddp);
#endif
}
static ErlDrvSSizeT
slow_drv_control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
SlowDrvData *sddp = (SlowDrvData *) drv_data;
char *res_str = "ok";
int res_len;
switch (command) {
case 0:
/* just be slow */
usleep(222000);
break;
case 1:
/* create pipes and select on input */
if (sddp->test) {
res_str = "no";
break;
}
sddp->test = 1;
pipe(sddp->s);
driver_select(sddp->port, (ErlDrvEvent) (ErlDrvSInt) sddp->s[0], DO_READ, 1);
break;
case 2:
if (!sddp->test) {
res_str = "no";
break;
}
write(sddp->s[1],"boo",3);
break;
}
res_len = strlen(res_str);
if (res_len > rlen) {
char *abuf = driver_alloc(sizeof(char)*res_len);
if (!abuf)
return 0;
*rbuf = abuf;
}
memcpy((void *) *rbuf, (void *) res_str, res_len);
return res_len;
}
static void
slow_drv_ready_input(ErlDrvData drv_data, ErlDrvEvent event)
{
#ifdef UNIX
SlowDrvData *sddp = (SlowDrvData *) drv_data;
int fd = (int) (ErlDrvSInt) event;
if (sddp->test) {
char buff[3];
usleep(212000);
read(sddp->s[0],buff,3);
driver_output(sddp->port, "TheEnd", 6);
}
#endif
}
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