getevent.c revision f6d0f8af1768b3b9b10760bba5583c5e721b64ea 
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <stdint.h>
5#include <dirent.h>
6#include <fcntl.h>
7#include <sys/ioctl.h>
8#include <sys/inotify.h>
9#include <sys/limits.h>
10#include <sys/poll.h>
11#include <linux/input.h>
12#include <errno.h>
13
14#include "getevent.h"
15
16static struct pollfd *ufds;
17static char **device_names;
18static int nfds;
19
20enum {
21    PRINT_DEVICE_ERRORS     = 1U << 0,
22    PRINT_DEVICE            = 1U << 1,
23    PRINT_DEVICE_NAME       = 1U << 2,
24    PRINT_DEVICE_INFO       = 1U << 3,
25    PRINT_VERSION           = 1U << 4,
26    PRINT_POSSIBLE_EVENTS   = 1U << 5,
27    PRINT_INPUT_PROPS       = 1U << 6,
28
29    PRINT_ALL_INFO          = (1U << 7) - 1,
30
31    PRINT_LABELS            = 1U << 16,
32};
33
34static const char *get_label(const struct label *labels, int value)
35{
36    while(labels->name && value != labels->value) {
37        labels++;
38    }
39    return labels->name;
40}
41
42static int print_input_props(int fd)
43{
44    uint8_t bits[INPUT_PROP_CNT / 8];
45    int i, j;
46    int res;
47    int count;
48    const char *bit_label;
49
50    printf("  input props:\n");
51    res = ioctl(fd, EVIOCGPROP(sizeof(bits)), bits);
52    if(res < 0) {
53        printf("    <not available\n");
54        return 1;
55    }
56    count = 0;
57    for(i = 0; i < res; i++) {
58        for(j = 0; j < 8; j++) {
59            if (bits[i] & 1 << j) {
60                bit_label = get_label(input_prop_labels, i * 8 + j);
61                if(bit_label)
62                    printf("    %s\n", bit_label);
63                else
64                    printf("    %04x\n", i * 8 + j);
65                count++;
66            }
67        }
68    }
69    if (!count)
70        printf("    <none>\n");
71    return 0;
72}
73
74static int print_possible_events(int fd, int print_flags)
75{
76    uint8_t *bits = NULL;
77    ssize_t bits_size = 0;
78    const char* label;
79    int i, j, k;
80    int res, res2;
81    struct label* bit_labels;
82    const char *bit_label;
83
84    printf("  events:\n");
85    for(i = EV_KEY; i <= EV_MAX; i++) { // skip EV_SYN since we cannot query its available codes
86        int count = 0;
87        while(1) {
88            res = ioctl(fd, EVIOCGBIT(i, bits_size), bits);
89            if(res < bits_size)
90                break;
91            bits_size = res + 16;
92            bits = realloc(bits, bits_size * 2);
93            if(bits == NULL) {
94                fprintf(stderr, "failed to allocate buffer of size %d\n", (int)bits_size);
95                return 1;
96            }
97        }
98        res2 = 0;
99        switch(i) {
100            case EV_KEY:
101                res2 = ioctl(fd, EVIOCGKEY(res), bits + bits_size);
102                label = "KEY";
103                bit_labels = key_labels;
104                break;
105            case EV_REL:
106                label = "REL";
107                bit_labels = rel_labels;
108                break;
109            case EV_ABS:
110                label = "ABS";
111                bit_labels = abs_labels;
112                break;
113            case EV_MSC:
114                label = "MSC";
115                bit_labels = msc_labels;
116                break;
117            case EV_LED:
118                res2 = ioctl(fd, EVIOCGLED(res), bits + bits_size);
119                label = "LED";
120                bit_labels = led_labels;
121                break;
122            case EV_SND:
123                res2 = ioctl(fd, EVIOCGSND(res), bits + bits_size);
124                label = "SND";
125                bit_labels = snd_labels;
126                break;
127            case EV_SW:
128                res2 = ioctl(fd, EVIOCGSW(bits_size), bits + bits_size);
129                label = "SW ";
130                bit_labels = sw_labels;
131                break;
132            case EV_REP:
133                label = "REP";
134                bit_labels = rep_labels;
135                break;
136            case EV_FF:
137                label = "FF ";
138                bit_labels = ff_labels;
139                break;
140            case EV_PWR:
141                label = "PWR";
142                bit_labels = NULL;
143                break;
144            case EV_FF_STATUS:
145                label = "FFS";
146                bit_labels = ff_status_labels;
147                break;
148            default:
149                res2 = 0;
150                label = "???";
151                bit_labels = NULL;
152        }
153        for(j = 0; j < res; j++) {
154            for(k = 0; k < 8; k++)
155                if(bits[j] & 1 << k) {
156                    char down;
157                    if(j < res2 && (bits[j + bits_size] & 1 << k))
158                        down = '*';
159                    else
160                        down = ' ';
161                    if(count == 0)
162                        printf("    %s (%04x):", label, i);
163                    else if((count & (print_flags & PRINT_LABELS ? 0x3 : 0x7)) == 0 || i == EV_ABS)
164                        printf("\n               ");
165                    if(bit_labels && (print_flags & PRINT_LABELS)) {
166                        bit_label = get_label(bit_labels, j * 8 + k);
167                        if(bit_label)
168                            printf(" %.20s%c%*s", bit_label, down, 20 - strlen(bit_label), "");
169                        else
170                            printf(" %04x%c                ", j * 8 + k, down);
171                    } else {
172                        printf(" %04x%c", j * 8 + k, down);
173                    }
174                    if(i == EV_ABS) {
175                        struct input_absinfo abs;
176                        if(ioctl(fd, EVIOCGABS(j * 8 + k), &abs) == 0) {
177                            printf(" : value %d, min %d, max %d, fuzz %d flat %d", abs.value, abs.minimum, abs.maximum, abs.fuzz, abs.flat);
178                        }
179                    }
180                    count++;
181                }
182        }
183        if(count)
184            printf("\n");
185    }
186    free(bits);
187    return 0;
188}
189
190static void print_event(int type, int code, int value, int print_flags)
191{
192    const char *type_label, *code_label, *value_label;
193
194    if (print_flags & PRINT_LABELS) {
195        type_label = get_label(ev_labels, type);
196        code_label = NULL;
197        value_label = NULL;
198
199        switch(type) {
200            case EV_SYN:
201                code_label = get_label(syn_labels, code);
202                break;
203            case EV_KEY:
204                code_label = get_label(key_labels, code);
205                value_label = get_label(key_value_labels, value);
206                break;
207            case EV_REL:
208                code_label = get_label(rel_labels, code);
209                break;
210            case EV_ABS:
211                code_label = get_label(abs_labels, code);
212                switch(code) {
213                    case ABS_MT_TOOL_TYPE:
214                        value_label = get_label(mt_tool_labels, value);
215                }
216                break;
217            case EV_MSC:
218                code_label = get_label(msc_labels, code);
219                break;
220            case EV_LED:
221                code_label = get_label(led_labels, code);
222                break;
223            case EV_SND:
224                code_label = get_label(snd_labels, code);
225                break;
226            case EV_SW:
227                code_label = get_label(sw_labels, code);
228                break;
229            case EV_REP:
230                code_label = get_label(rep_labels, code);
231                break;
232            case EV_FF:
233                code_label = get_label(ff_labels, code);
234                break;
235            case EV_FF_STATUS:
236                code_label = get_label(ff_status_labels, code);
237                break;
238        }
239
240        if (type_label)
241            printf("%-12.12s", type_label);
242        else
243            printf("%04x        ", type);
244        if (code_label)
245            printf(" %-20.20s", code_label);
246        else
247            printf(" %04x                ", code);
248        if (value_label)
249            printf(" %-20.20s", value_label);
250        else
251            printf(" %08x            ", value);
252    } else {
253        printf("%04x %04x %08x", type, code, value);
254    }
255}
256
257static int open_device(const char *device, int print_flags)
258{
259    int version;
260    int fd;
261    struct pollfd *new_ufds;
262    char **new_device_names;
263    char name[80];
264    char location[80];
265    char idstr[80];
266    struct input_id id;
267
268    fd = open(device, O_RDWR);
269    if(fd < 0) {
270        if(print_flags & PRINT_DEVICE_ERRORS)
271            fprintf(stderr, "could not open %s, %s\n", device, strerror(errno));
272        return -1;
273    }
274
275    if(ioctl(fd, EVIOCGVERSION, &version)) {
276        if(print_flags & PRINT_DEVICE_ERRORS)
277            fprintf(stderr, "could not get driver version for %s, %s\n", device, strerror(errno));
278        return -1;
279    }
280    if(ioctl(fd, EVIOCGID, &id)) {
281        if(print_flags & PRINT_DEVICE_ERRORS)
282            fprintf(stderr, "could not get driver id for %s, %s\n", device, strerror(errno));
283        return -1;
284    }
285    name[sizeof(name) - 1] = '\0';
286    location[sizeof(location) - 1] = '\0';
287    idstr[sizeof(idstr) - 1] = '\0';
288    if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
289        //fprintf(stderr, "could not get device name for %s, %s\n", device, strerror(errno));
290        name[0] = '\0';
291    }
292    if(ioctl(fd, EVIOCGPHYS(sizeof(location) - 1), &location) < 1) {
293        //fprintf(stderr, "could not get location for %s, %s\n", device, strerror(errno));
294        location[0] = '\0';
295    }
296    if(ioctl(fd, EVIOCGUNIQ(sizeof(idstr) - 1), &idstr) < 1) {
297        //fprintf(stderr, "could not get idstring for %s, %s\n", device, strerror(errno));
298        idstr[0] = '\0';
299    }
300
301    new_ufds = realloc(ufds, sizeof(ufds[0]) * (nfds + 1));
302    if(new_ufds == NULL) {
303        fprintf(stderr, "out of memory\n");
304        return -1;
305    }
306    ufds = new_ufds;
307    new_device_names = realloc(device_names, sizeof(device_names[0]) * (nfds + 1));
308    if(new_device_names == NULL) {
309        fprintf(stderr, "out of memory\n");
310        return -1;
311    }
312    device_names = new_device_names;
313
314    if(print_flags & PRINT_DEVICE)
315        printf("add device %d: %s\n", nfds, device);
316    if(print_flags & PRINT_DEVICE_INFO)
317        printf("  bus:      %04x\n"
318               "  vendor    %04x\n"
319               "  product   %04x\n"
320               "  version   %04x\n",
321               id.bustype, id.vendor, id.product, id.version);
322    if(print_flags & PRINT_DEVICE_NAME)
323        printf("  name:     \"%s\"\n", name);
324    if(print_flags & PRINT_DEVICE_INFO)
325        printf("  location: \"%s\"\n"
326               "  id:       \"%s\"\n", location, idstr);
327    if(print_flags & PRINT_VERSION)
328        printf("  version:  %d.%d.%d\n",
329               version >> 16, (version >> 8) & 0xff, version & 0xff);
330
331    if(print_flags & PRINT_POSSIBLE_EVENTS) {
332        print_possible_events(fd, print_flags);
333    }
334
335    if(print_flags & PRINT_INPUT_PROPS) {
336        print_input_props(fd);
337    }
338
339    ufds[nfds].fd = fd;
340    ufds[nfds].events = POLLIN;
341    device_names[nfds] = strdup(device);
342    nfds++;
343
344    return 0;
345}
346
347int close_device(const char *device, int print_flags)
348{
349    int i;
350    for(i = 1; i < nfds; i++) {
351        if(strcmp(device_names[i], device) == 0) {
352            int count = nfds - i - 1;
353            if(print_flags & PRINT_DEVICE)
354                printf("remove device %d: %s\n", i, device);
355            free(device_names[i]);
356            memmove(device_names + i, device_names + i + 1, sizeof(device_names[0]) * count);
357            memmove(ufds + i, ufds + i + 1, sizeof(ufds[0]) * count);
358            nfds--;
359            return 0;
360        }
361    }
362    if(print_flags & PRINT_DEVICE_ERRORS)
363        fprintf(stderr, "remote device: %s not found\n", device);
364    return -1;
365}
366
367static int read_notify(const char *dirname, int nfd, int print_flags)
368{
369    int res;
370    char devname[PATH_MAX];
371    char *filename;
372    char event_buf[512];
373    int event_size;
374    int event_pos = 0;
375    struct inotify_event *event;
376
377    res = read(nfd, event_buf, sizeof(event_buf));
378    if(res < (int)sizeof(*event)) {
379        if(errno == EINTR)
380            return 0;
381        fprintf(stderr, "could not get event, %s\n", strerror(errno));
382        return 1;
383    }
384    //printf("got %d bytes of event information\n", res);
385
386    strcpy(devname, dirname);
387    filename = devname + strlen(devname);
388    *filename++ = '/';
389
390    while(res >= (int)sizeof(*event)) {
391        event = (struct inotify_event *)(event_buf + event_pos);
392        //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
393        if(event->len) {
394            strcpy(filename, event->name);
395            if(event->mask & IN_CREATE) {
396                open_device(devname, print_flags);
397            }
398            else {
399                close_device(devname, print_flags);
400            }
401        }
402        event_size = sizeof(*event) + event->len;
403        res -= event_size;
404        event_pos += event_size;
405    }
406    return 0;
407}
408
409static int scan_dir(const char *dirname, int print_flags)
410{
411    char devname[PATH_MAX];
412    char *filename;
413    DIR *dir;
414    struct dirent *de;
415    dir = opendir(dirname);
416    if(dir == NULL)
417        return -1;
418    strcpy(devname, dirname);
419    filename = devname + strlen(devname);
420    *filename++ = '/';
421    while((de = readdir(dir))) {
422        if(de->d_name[0] == '.' &&
423           (de->d_name[1] == '\0' ||
424            (de->d_name[1] == '.' && de->d_name[2] == '\0')))
425            continue;
426        strcpy(filename, de->d_name);
427        open_device(devname, print_flags);
428    }
429    closedir(dir);
430    return 0;
431}
432
433static void usage(int argc, char *argv[])
434{
435    fprintf(stderr, "Usage: %s [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-p] [-i] [-l] [-q] [-c count] [-r] [device]\n", argv[0]);
436    fprintf(stderr, "    -t: show time stamps\n");
437    fprintf(stderr, "    -n: don't print newlines\n");
438    fprintf(stderr, "    -s: print switch states for given bits\n");
439    fprintf(stderr, "    -S: print all switch states\n");
440    fprintf(stderr, "    -v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64)\n");
441    fprintf(stderr, "    -p: show possible events (errs, dev, name, pos. events)\n");
442    fprintf(stderr, "    -i: show all device info and possible events\n");
443    fprintf(stderr, "    -l: label event types and names in plain text\n");
444    fprintf(stderr, "    -q: quiet (clear verbosity mask)\n");
445    fprintf(stderr, "    -c: print given number of events then exit\n");
446    fprintf(stderr, "    -r: print rate events are received\n");
447}
448
449int getevent_main(int argc, char *argv[])
450{
451    int c;
452    int i;
453    int res;
454    int pollres;
455    int get_time = 0;
456    int print_device = 0;
457    char *newline = "\n";
458    uint16_t get_switch = 0;
459    struct input_event event;
460    int version;
461    int print_flags = 0;
462    int print_flags_set = 0;
463    int dont_block = -1;
464    int event_count = 0;
465    int sync_rate = 0;
466    int64_t last_sync_time = 0;
467    const char *device = NULL;
468    const char *device_path = "/dev/input";
469
470    opterr = 0;
471    do {
472        c = getopt(argc, argv, "tns:Sv::pilqc:rh");
473        if (c == EOF)
474            break;
475        switch (c) {
476        case 't':
477            get_time = 1;
478            break;
479        case 'n':
480            newline = "";
481            break;
482        case 's':
483            get_switch = strtoul(optarg, NULL, 0);
484            if(dont_block == -1)
485                dont_block = 1;
486            break;
487        case 'S':
488            get_switch = ~0;
489            if(dont_block == -1)
490                dont_block = 1;
491            break;
492        case 'v':
493            if(optarg)
494                print_flags |= strtoul(optarg, NULL, 0);
495            else
496                print_flags |= PRINT_DEVICE | PRINT_DEVICE_NAME | PRINT_DEVICE_INFO | PRINT_VERSION;
497            print_flags_set = 1;
498            break;
499        case 'p':
500            print_flags |= PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME | PRINT_POSSIBLE_EVENTS;
501            print_flags_set = 1;
502            if(dont_block == -1)
503                dont_block = 1;
504            break;
505        case 'i':
506            print_flags |= PRINT_ALL_INFO;
507            print_flags_set = 1;
508            if(dont_block == -1)
509                dont_block = 1;
510            break;
511        case 'l':
512            print_flags |= PRINT_LABELS;
513            break;
514        case 'q':
515            print_flags_set = 1;
516            break;
517        case 'c':
518            event_count = atoi(optarg);
519            dont_block = 0;
520            break;
521        case 'r':
522            sync_rate = 1;
523            break;
524        case '?':
525            fprintf(stderr, "%s: invalid option -%c\n",
526                argv[0], optopt);
527        case 'h':
528            usage(argc, argv);
529            exit(1);
530        }
531    } while (1);
532    if(dont_block == -1)
533        dont_block = 0;
534
535    if (optind + 1 == argc) {
536        device = argv[optind];
537        optind++;
538    }
539    if (optind != argc) {
540        usage(argc, argv);
541        exit(1);
542    }
543    nfds = 1;
544    ufds = calloc(1, sizeof(ufds[0]));
545    ufds[0].fd = inotify_init();
546    ufds[0].events = POLLIN;
547    if(device) {
548        if(!print_flags_set)
549            print_flags |= PRINT_DEVICE_ERRORS;
550        res = open_device(device, print_flags);
551        if(res < 0) {
552            return 1;
553        }
554    } else {
555        if(!print_flags_set)
556            print_flags |= PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME;
557        print_device = 1;
558		res = inotify_add_watch(ufds[0].fd, device_path, IN_DELETE | IN_CREATE);
559        if(res < 0) {
560            fprintf(stderr, "could not add watch for %s, %s\n", device_path, strerror(errno));
561            return 1;
562        }
563        res = scan_dir(device_path, print_flags);
564        if(res < 0) {
565            fprintf(stderr, "scan dir failed for %s\n", device_path);
566            return 1;
567        }
568    }
569
570    if(get_switch) {
571        for(i = 1; i < nfds; i++) {
572            uint16_t sw;
573            res = ioctl(ufds[i].fd, EVIOCGSW(1), &sw);
574            if(res < 0) {
575                fprintf(stderr, "could not get switch state, %s\n", strerror(errno));
576                return 1;
577            }
578            sw &= get_switch;
579            printf("%04x%s", sw, newline);
580        }
581    }
582
583    if(dont_block)
584        return 0;
585
586    while(1) {
587        pollres = poll(ufds, nfds, -1);
588        //printf("poll %d, returned %d\n", nfds, pollres);
589        if(ufds[0].revents & POLLIN) {
590            read_notify(device_path, ufds[0].fd, print_flags);
591        }
592        for(i = 1; i < nfds; i++) {
593            if(ufds[i].revents) {
594                if(ufds[i].revents & POLLIN) {
595                    res = read(ufds[i].fd, &event, sizeof(event));
596                    if(res < (int)sizeof(event)) {
597                        fprintf(stderr, "could not get event\n");
598                        return 1;
599                    }
600                    if(get_time) {
601                        printf("%ld-%ld: ", event.time.tv_sec, event.time.tv_usec);
602                    }
603                    if(print_device)
604                        printf("%s: ", device_names[i]);
605                    print_event(event.type, event.code, event.value, print_flags);
606                    if(sync_rate && event.type == 0 && event.code == 0) {
607                        int64_t now = event.time.tv_sec * 1000000LL + event.time.tv_usec;
608                        if(last_sync_time)
609                            printf(" rate %lld", 1000000LL / (now - last_sync_time));
610                        last_sync_time = now;
611                    }
612                    printf("%s", newline);
613                    if(event_count && --event_count == 0)
614                        return 0;
615                }
616            }
617        }
618    }
619
620    return 0;
621}
622