path: root/lib/kernel/test/seq_trace_SUITE_data/echo_drv.c

#include <stdio.h>
#include "erl_driver.h"

static ErlDrvPort erlang_port;
static ErlDrvData echo_start(ErlDrvPort, char *);
static void echo_stop(ErlDrvData), echo_read(ErlDrvData, char*, ErlDrvSizeT);

static ErlDrvEntry echo_driver_entry = { 
    NULL,
    echo_start,
    echo_stop,
    echo_read,
    NULL,
    NULL,
    "echo_drv",
    NULL,
    NULL, /* handle */
    NULL, /* control */
    NULL, /* timeout */
    NULL, /* outputv */
    NULL, /* ready_async */
    NULL,
    NULL,
    NULL,
    ERL_DRV_EXTENDED_MARKER,
    ERL_DRV_EXTENDED_MAJOR_VERSION,
    ERL_DRV_EXTENDED_MINOR_VERSION,
    0,
    NULL,
    NULL,
    NULL,
};

DRIVER_INIT(echo_drv)
{
    erlang_port = (ErlDrvPort)-1;
    return &echo_driver_entry;
}

static ErlDrvData echo_start(ErlDrvPort port,char *buf)
{
    if (erlang_port != (ErlDrvPort)-1) {
	return ERL_DRV_ERROR_GENERAL;
    }
    erlang_port = port;
    return (ErlDrvData)port;
}

static void echo_read(ErlDrvData data, char *buf, ErlDrvSizeT count)
{
    driver_output(erlang_port, buf, count);
}

static void echo_stop(ErlDrvData data)
{
    erlang_port = (ErlDrvPort)-1;
}