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#include <stdio.h>
#include "erl_driver.h"
#include <errno.h>
#include <string.h>
/* -------------------------------------------------------------------------
** Data types
**/
typedef struct _erl_drv_data {
ErlDrvPort erlang_port;
ErlDrvTermData caller;
} EchoDrvData;
struct remote_send_term {
char *buf;
int len;
ErlDrvTermData port;
ErlDrvTermData caller;
};
#define ECHO_DRV_NOOP 0
#define ECHO_DRV_OUTPUT 1
#define ECHO_DRV_OUTPUT2 2
#define ECHO_DRV_OUTPUT_BINARY 3
#define ECHO_DRV_OUTPUTV 4
#define ECHO_DRV_SET_TIMER 5
#define ECHO_DRV_FAILURE_EOF 6
#define ECHO_DRV_FAILURE_ATOM 7
#define ECHO_DRV_FAILURE_POSIX 8
#define ECHO_DRV_FAILURE 9
#define ECHO_DRV_OUTPUT_TERM 10
#define ECHO_DRV_DRIVER_OUTPUT_TERM 11
#define ECHO_DRV_SEND_TERM 12
#define ECHO_DRV_DRIVER_SEND_TERM 13
#define ECHO_DRV_SAVE_CALLER 14
#define ECHO_DRV_REMOTE_SEND_TERM 15
/* -------------------------------------------------------------------------
** Entry struct
**/
static EchoDrvData *echo_drv_start(ErlDrvPort port, char *command);
static void echo_drv_stop(ErlDrvData drv_data);
static void echo_drv_output(ErlDrvData drv_data, char *buf,
ErlDrvSizeT len);
static void echo_drv_outputv(ErlDrvData drv_data, ErlIOVec *iov);
static void echo_drv_finish(void);
static ErlDrvSSizeT echo_drv_control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen);
static void echo_drv_timeout(ErlDrvData drv_data);
static ErlDrvSSizeT echo_drv_call(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen,
unsigned int *flags);
static ErlDrvEntry echo_drv_entry = {
NULL, /* init */
echo_drv_start,
echo_drv_stop,
echo_drv_output,
NULL, /* ready_input */
NULL, /* ready_output */
"echo_drv",
echo_drv_finish,
NULL, /* handle */
echo_drv_control,
echo_drv_timeout, /* timeout */
NULL, /* outputv */
NULL, /* ready_async */
NULL, /* flush */
echo_drv_call, /* call */
NULL, /* event */
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
0,
NULL,
NULL,
NULL
};
static void send_term_thread(void *);
/* -------------------------------------------------------------------------
** Entry functions
**/
DRIVER_INIT(echo_drv)
{
char buff[5];
size_t size = sizeof(buff);
if (erl_drv_getenv("OUTPUTV", buff, &size) == -1) {
echo_drv_entry.outputv = NULL;
} else {
echo_drv_entry.outputv = echo_drv_outputv;
}
return &echo_drv_entry;
}
static EchoDrvData *echo_drv_start(ErlDrvPort port, char *command)
{
EchoDrvData *echo_drv_data_p = driver_alloc(sizeof(EchoDrvData));
echo_drv_data_p->erlang_port = port;
echo_drv_data_p->caller = driver_caller(port);
return echo_drv_data_p;
}
static void echo_drv_stop(EchoDrvData *data_p) {
driver_free(data_p);
}
static void echo_drv_outputv(ErlDrvData drv_data, ErlIOVec *iov)
{
return;
}
static void echo_drv_output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len) {
EchoDrvData* data_p = (EchoDrvData *) drv_data;
ErlDrvPort port = data_p->erlang_port;
switch (buf[0]) {
case ECHO_DRV_OUTPUT:
{
driver_output(port, buf+1, len-1);
break;
}
case ECHO_DRV_OUTPUT2:
{
driver_output2(port, "a", 1, buf+1, len-1);
break;
}
case ECHO_DRV_OUTPUT_BINARY:
{
ErlDrvBinary *bin = driver_alloc_binary(len-1);
memcpy(&bin->orig_bytes, buf+1, len-1);
driver_output_binary(port, "a", 1, bin, 1, len - 2);
driver_free_binary(bin);
break;
}
case ECHO_DRV_OUTPUTV:
{
ErlIOVec iov;
ErlDrvSizeT sz;
driver_enq(port, buf + 1, len - 1);
sz = driver_peekqv(port, &iov);
driver_outputv(port, "a", 1, &iov, 0);
driver_deq(port, sz);
break;
}
case ECHO_DRV_SET_TIMER:
{
driver_set_timer(port, 10);
break;
}
case ECHO_DRV_FAILURE_EOF:
{
driver_failure_eof(port);
break;
}
case ECHO_DRV_FAILURE_ATOM:
{
driver_failure_atom(port, buf+1);
break;
}
case ECHO_DRV_FAILURE_POSIX:
{
driver_failure_posix(port, EAGAIN);
break;
}
case ECHO_DRV_FAILURE:
{
driver_failure(port, buf[1]);
break;
}
case ECHO_DRV_OUTPUT_TERM:
case ECHO_DRV_DRIVER_OUTPUT_TERM:
case ECHO_DRV_SEND_TERM:
case ECHO_DRV_DRIVER_SEND_TERM:
{
ErlDrvTermData term[] = {
ERL_DRV_ATOM, driver_mk_atom("echo"),
ERL_DRV_PORT, driver_mk_port(port),
ERL_DRV_BUF2BINARY, (ErlDrvTermData)(buf+1),
(ErlDrvTermData)(len - 1),
ERL_DRV_TUPLE, 3};
switch (buf[0]) {
case ECHO_DRV_OUTPUT_TERM:
erl_drv_output_term(driver_mk_port(port), term, sizeof(term) / sizeof(ErlDrvTermData));
break;
case ECHO_DRV_DRIVER_OUTPUT_TERM:
driver_output_term(port, term, sizeof(term) / sizeof(ErlDrvTermData));
break;
case ECHO_DRV_SEND_TERM:
driver_send_term(port, data_p->caller,
term, sizeof(term) / sizeof(ErlDrvTermData));
break;
case ECHO_DRV_DRIVER_SEND_TERM:
erl_drv_send_term(driver_mk_port(port), data_p->caller,
term, sizeof(term) / sizeof(ErlDrvTermData));
break;
}
break;
}
case ECHO_DRV_REMOTE_SEND_TERM:
{
ErlDrvTid tid;
struct remote_send_term *t = malloc(sizeof(struct remote_send_term));
t->len = len-1;
t->buf = malloc(len-1);
t->port = driver_mk_port(port);
t->caller = data_p->caller;
memcpy(t->buf, buf+1, t->len);
erl_drv_thread_create("tmp_thread", &tid, send_term_thread, t, NULL);
break;
}
case ECHO_DRV_SAVE_CALLER:
data_p->caller = driver_caller(port);
break;
default:
break;
}
}
static void echo_drv_finish() {
}
static ErlDrvSSizeT echo_drv_control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
if ((len - 1) > rlen)
*rbuf = driver_alloc(len - 1);
memcpy(*rbuf, buf+1, len-1);
return len-1;
}
static void echo_drv_timeout(ErlDrvData drv_data)
{
}
static ErlDrvSSizeT echo_drv_call(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen,
unsigned int *flags)
{
if ((len - command) > rlen)
*rbuf = driver_alloc(len - command);
memcpy(*rbuf, buf+command, len-command);
return len-command;
}
static void send_term_thread(void *a)
{
struct remote_send_term *t = (struct remote_send_term*)a;
ErlDrvTermData term[] = {
ERL_DRV_ATOM, driver_mk_atom("echo"),
ERL_DRV_PORT, t->port,
ERL_DRV_BUF2BINARY, (ErlDrvTermData)(t->buf),
(ErlDrvTermData)(t->len),
ERL_DRV_TUPLE, 3};
erl_drv_send_term(t->port, t->caller,
term, sizeof(term) / sizeof(ErlDrvTermData));
return;
}
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