1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
#ifdef __WIN32__
#include <windows.h>
#endif
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "erl_driver.h"
typedef struct _erl_drv_data {
ErlDrvPort erlang_port;
} EchoDrvData;
static EchoDrvData slow_drv_data, *slow_drv_data_p;
static EchoDrvData *slow_drv_start(ErlDrvPort port, char *command);
static void slow_drv_stop(EchoDrvData *data_p);
static void slow_drv_output(ErlDrvData drv_data, char *buf,
ErlDrvSizeT len);
static ErlDrvSSizeT slow_drv_control(ErlDrvData drv_data, unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen);
static void slow_drv_timeout(ErlDrvData drv_data);
static void slow_drv_finish(void);
static ErlDrvEntry slow_drv_entry = {
NULL, /* init */
slow_drv_start,
slow_drv_stop,
slow_drv_output,
NULL, /* ready_input */
NULL, /* ready_output */
"slow_drv",
slow_drv_finish,
NULL, /* handle */
slow_drv_control, /* control */
slow_drv_timeout, /* 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(slow_drv)
{
slow_drv_data_p = NULL;
return &slow_drv_entry;
}
static EchoDrvData *slow_drv_start(ErlDrvPort port, char *command)
{
if (slow_drv_data_p != NULL) {
return ERL_DRV_ERROR_GENERAL;
}
slow_drv_data_p = &slow_drv_data;
slow_drv_data_p->erlang_port = port;
return slow_drv_data_p;
}
static void slow_drv_stop(EchoDrvData *data_p) {
slow_drv_data_p = NULL;
}
static void slow_drv_output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len) {
EchoDrvData* data_p = (EchoDrvData *) drv_data;
driver_output(data_p->erlang_port, buf, len);
}
static ErlDrvSSizeT slow_drv_control(ErlDrvData drv_data, unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
EchoDrvData* data_p = (EchoDrvData *) drv_data;
memcpy(*rbuf,"ok",2);
if (command == 1) {
driver_set_timer(data_p->erlang_port, 0);
} else {
slow_drv_timeout(drv_data);
}
return 2;
}
static void slow_drv_timeout(ErlDrvData drv_data)
{
/* Sleep for 150 msec */
#ifdef __WIN32__
Sleep(150);
#else
usleep(150000);
#endif
}
static void slow_drv_finish() {
slow_drv_data_p = NULL;
}
|
