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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/select.h>
#include "input.h"
/* ------------------------------------------------------------------ */
static void show_events(int nr, int timeout, int grab)
{
struct input_event event;
struct timeval tv;
int fd, quit;
fd_set set;
fd = device_open(nr,1);
if (-1 == fd)
return;
device_info(fd);
if (grab) {
if (-1 == ioctl(fd,EVIOCGRAB,1)) {
perror("ioctl EVIOCGRAB(1)");
close(fd);
return;
}
printf("grabbed input device\n");
}
printf("waiting for events\n");
quit = 0;
for (;;) {
/* wait for input */
FD_ZERO(&set);
FD_SET(fd,&set);
tv.tv_sec = timeout;
tv.tv_usec = 0;
switch (select(fd+1,&set,NULL,NULL,&tv)) {
case -1:
perror("select");
quit = 1;
break;
case 0:
printf("timeout, quitting\n");
quit = 1;
break;
}
if (quit)
break;
/* read input */
if (FD_ISSET(fd,&set)) {
switch (read(fd,&event,sizeof(event))) {
case -1:
perror("read");
quit = 1;
break;
case 0:
printf("EOF\n");
quit = 1;
break;
default:
print_event(&event);
break;
}
}
if (quit)
break;
}
if (grab) {
if (-1 == ioctl(fd,EVIOCGRAB,0)) {
perror("ioctl EVIOCGRAB(0)");
close(fd);
return;
}
printf("released input device\n");
}
close(fd);
}
static int usage(char *prog, int error)
{
fprintf(error ? stderr : stdout,
"usage: %s"
" [ -g ] [ -t <sec> ]"
" devnr\n",
prog);
exit(error);
}
int main(int argc, char *argv[])
{
int timeout = 10;
int grab = 0;
int c,devnr;
for (;;) {
if (-1 == (c = getopt(argc, argv, "hgt:")))
break;
switch (c) {
case 't':
timeout = atoi(optarg);
break;
case 'g':
grab = 1;
break;
case 'h':
usage(argv[0],0);
default:
usage(argv[0],1);
}
}
if (optind == argc)
usage(argv[0],1);
devnr = atoi(argv[optind]);
show_events(devnr,timeout,grab);
return 0;
}
/* ---------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
|
