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#include <stdio.h>
#include "erl_driver.h"
static ErlDrvPort erlang_port;
static ErlDrvData echo_start(ErlDrvPort, char *);
static void from_erlang(ErlDrvData, char*, ErlDrvSizeT);
static ErlDrvSSizeT echo_call(ErlDrvData drv_data, unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen, unsigned *ret_flags);
static ErlDrvEntry echo_driver_entry = {
NULL, /* Init */
echo_start,
NULL, /* Stop */
from_erlang,
NULL, /* Ready input */
NULL, /* Ready output */
"lock_drv",
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
echo_call,
NULL,
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
0,
NULL,
NULL,
NULL
};
DRIVER_INIT(echo_drv)
{
return &echo_driver_entry;
}
static ErlDrvData
echo_start(ErlDrvPort port, char *buf)
{
driver_lock_driver(port);
return (ErlDrvData) port;
}
static void
from_erlang(ErlDrvData data, char *buf, ErlDrvSizeT count)
{
driver_output((ErlDrvPort) data, buf, count);
}
static ErlDrvSSizeT
echo_call(ErlDrvData drv_data, unsigned int command,
char *buf, ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen,
unsigned *ret_flags)
{
ErlDrvPort port = (ErlDrvPort) drv_data;
driver_lock_driver(port);
*rbuf = buf;
*ret_flags |= DRIVER_CALL_KEEP_BUFFER;
return len;
}
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