sendevent.c revision 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <stdint.h>
5#include <fcntl.h>
6#include <sys/ioctl.h>
7//#include <linux/input.h> // this does not compile
8#include <errno.h>
9
10
11// from <linux/input.h>
12
13struct input_event {
14	struct timeval time;
15	__u16 type;
16	__u16 code;
17	__s32 value;
18};
19
20#define EVIOCGVERSION		_IOR('E', 0x01, int)			/* get driver version */
21#define EVIOCGID		_IOR('E', 0x02, struct input_id)	/* get device ID */
22#define EVIOCGKEYCODE		_IOR('E', 0x04, int[2])			/* get keycode */
23#define EVIOCSKEYCODE		_IOW('E', 0x04, int[2])			/* set keycode */
24
25#define EVIOCGNAME(len)		_IOC(_IOC_READ, 'E', 0x06, len)		/* get device name */
26#define EVIOCGPHYS(len)		_IOC(_IOC_READ, 'E', 0x07, len)		/* get physical location */
27#define EVIOCGUNIQ(len)		_IOC(_IOC_READ, 'E', 0x08, len)		/* get unique identifier */
28
29#define EVIOCGKEY(len)		_IOC(_IOC_READ, 'E', 0x18, len)		/* get global keystate */
30#define EVIOCGLED(len)		_IOC(_IOC_READ, 'E', 0x19, len)		/* get all LEDs */
31#define EVIOCGSND(len)		_IOC(_IOC_READ, 'E', 0x1a, len)		/* get all sounds status */
32#define EVIOCGSW(len)		_IOC(_IOC_READ, 'E', 0x1b, len)		/* get all switch states */
33
34#define EVIOCGBIT(ev,len)	_IOC(_IOC_READ, 'E', 0x20 + ev, len)	/* get event bits */
35#define EVIOCGABS(abs)		_IOR('E', 0x40 + abs, struct input_absinfo)		/* get abs value/limits */
36#define EVIOCSABS(abs)		_IOW('E', 0xc0 + abs, struct input_absinfo)		/* set abs value/limits */
37
38#define EVIOCSFF		_IOC(_IOC_WRITE, 'E', 0x80, sizeof(struct ff_effect))	/* send a force effect to a force feedback device */
39#define EVIOCRMFF		_IOW('E', 0x81, int)			/* Erase a force effect */
40#define EVIOCGEFFECTS		_IOR('E', 0x84, int)			/* Report number of effects playable at the same time */
41
42#define EVIOCGRAB		_IOW('E', 0x90, int)			/* Grab/Release device */
43
44// end <linux/input.h>
45
46
47
48int sendevent_main(int argc, char *argv[])
49{
50    int i;
51    int fd;
52    int ret;
53    int version;
54    struct input_event event;
55
56    if(argc != 5) {
57        fprintf(stderr, "use: %s device type code value\n", argv[0]);
58        return 1;
59    }
60
61    fd = open(argv[1], O_RDWR);
62    if(fd < 0) {
63        fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));
64        return 1;
65    }
66    if (ioctl(fd, EVIOCGVERSION, &version)) {
67        fprintf(stderr, "could not get driver version for %s, %s\n", argv[optind], strerror(errno));
68        return 1;
69    }
70    memset(&event, 0, sizeof(event));
71    event.type = atoi(argv[2]);
72    event.code = atoi(argv[3]);
73    event.value = atoi(argv[4]);
74    ret = write(fd, &event, sizeof(event));
75    if(ret < sizeof(event)) {
76        fprintf(stderr, "write event failed, %s\n", strerror(errno));
77        return -1;
78    }
79    return 0;
80}
81