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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2017. 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%
*/
/* Purpose: demonstrate how to include interrupt handlers in erlang */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_driver.h"
#include <signal.h>
#include <stdio.h>
static ErlDrvData sig_start(ErlDrvPort, char*);
static int sig_init(void);
static void sig_stop(ErlDrvData), doio(ErlDrvData, ErlDrvEvent);
ErlDrvEntry sig_driver_entry = {
sig_init,
sig_start,
sig_stop,
NULL,
doio,
NULL,
"sig_test"
};
static ErlDrvPort this_port;
static int sig_init(void)
{
this_port = (ErlDrvPort)-1;
return 0;
}
static sigc(int ino)
{
driver_interrupt(this_port, ino);
}
static ErlDrvData sig_start(ErlDrvPort port, char* buf)
{
if (this_port != (ErlDrvPort)-1)
return ERL_DRV_ERROR_GENERAL;
this_port = port;
signal(SIGUSR1, sigc);
return (ErlDrvData)port;
}
static void sig_stop(ErlDrvData port)
{
this_port = (ErlDrvPort)-1;
signal(SIGUSR1, SIG_DFL);
}
doio(ErlDrvData port, ErlDrvEvent ino)
{
/* First go get the io, unless we already did that */
/* In the sighandler */
/* Then send it to erlang */
driver_output(this_port, "y", 1);
}
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