getevent.c revision aa907768af7ba9e29901d356cdcac6a436970323 
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    PRINT_HID_DESCRIPTOR    = 1U << 7,
29
30    PRINT_ALL_INFO          = (1U << 8) - 1,
31
32    PRINT_LABELS            = 1U << 16,
33};
34
35static const char *get_label(const struct label *labels, int value)
36{
37    while(labels->name && value != labels->value) {
38        labels++;
39    }
40    return labels->name;
41}
42
43static int print_input_props(int fd)
44{
45    uint8_t bits[INPUT_PROP_CNT / 8];
46    int i, j;
47    int res;
48    int count;
49    const char *bit_label;
50
51    printf("  input props:\n");
52    res = ioctl(fd, EVIOCGPROP(sizeof(bits)), bits);
53    if(res < 0) {
54        printf("    <not available\n");
55        return 1;
56    }
57    count = 0;
58    for(i = 0; i < res; i++) {
59        for(j = 0; j < 8; j++) {
60            if (bits[i] & 1 << j) {
61                bit_label = get_label(input_prop_labels, i * 8 + j);
62                if(bit_label)
63                    printf("    %s\n", bit_label);
64                else
65                    printf("    %04x\n", i * 8 + j);
66                count++;
67            }
68        }
69    }
70    if (!count)
71        printf("    <none>\n");
72    return 0;
73}
74
75static int print_possible_events(int fd, int print_flags)
76{
77    uint8_t *bits = NULL;
78    ssize_t bits_size = 0;
79    const char* label;
80    int i, j, k;
81    int res, res2;
82    struct label* bit_labels;
83    const char *bit_label;
84
85    printf("  events:\n");
86    for(i = EV_KEY; i <= EV_MAX; i++) { // skip EV_SYN since we cannot query its available codes
87        int count = 0;
88        while(1) {
89            res = ioctl(fd, EVIOCGBIT(i, bits_size), bits);
90            if(res < bits_size)
91                break;
92            bits_size = res + 16;
93            bits = realloc(bits, bits_size * 2);
94            if(bits == NULL) {
95                fprintf(stderr, "failed to allocate buffer of size %d\n", (int)bits_size);
96                return 1;
97            }
98        }
99        res2 = 0;
100        switch(i) {
101            case EV_KEY:
102                res2 = ioctl(fd, EVIOCGKEY(res), bits + bits_size);
103                label = "KEY";
104                bit_labels = key_labels;
105                break;
106            case EV_REL:
107                label = "REL";
108                bit_labels = rel_labels;
109                break;
110            case EV_ABS:
111                label = "ABS";
112                bit_labels = abs_labels;
113                break;
114            case EV_MSC:
115                label = "MSC";
116                bit_labels = msc_labels;
117                break;
118            case EV_LED:
119                res2 = ioctl(fd, EVIOCGLED(res), bits + bits_size);
120                label = "LED";
121                bit_labels = led_labels;
122                break;
123            case EV_SND:
124                res2 = ioctl(fd, EVIOCGSND(res), bits + bits_size);
125                label = "SND";
126                bit_labels = snd_labels;
127                break;
128            case EV_SW:
129                res2 = ioctl(fd, EVIOCGSW(bits_size), bits + bits_size);
130                label = "SW ";
131                bit_labels = sw_labels;
132                break;
133            case EV_REP:
134                label = "REP";
135                bit_labels = rep_labels;
136                break;
137            case EV_FF:
138                label = "FF ";
139                bit_labels = ff_labels;
140                break;
141            case EV_PWR:
142                label = "PWR";
143                bit_labels = NULL;
144                break;
145            case EV_FF_STATUS:
146                label = "FFS";
147                bit_labels = ff_status_labels;
148                break;
149            default:
150                res2 = 0;
151                label = "???";
152                bit_labels = NULL;
153        }
154        for(j = 0; j < res; j++) {
155            for(k = 0; k < 8; k++)
156                if(bits[j] & 1 << k) {
157                    char down;
158                    if(j < res2 && (bits[j + bits_size] & 1 << k))
159                        down = '*';
160                    else
161                        down = ' ';
162                    if(count == 0)
163                        printf("    %s (%04x):", label, i);
164                    else if((count & (print_flags & PRINT_LABELS ? 0x3 : 0x7)) == 0 || i == EV_ABS)
165                        printf("\n               ");
166                    if(bit_labels && (print_flags & PRINT_LABELS)) {
167                        bit_label = get_label(bit_labels, j * 8 + k);
168                        if(bit_label)
169                            printf(" %.20s%c%*s", bit_label, down, (int) (20 - strlen(bit_label)), "");
170                        else
171                            printf(" %04x%c                ", j * 8 + k, down);
172                    } else {
173                        printf(" %04x%c", j * 8 + k, down);
174                    }
175                    if(i == EV_ABS) {
176                        struct input_absinfo abs;
177                        if(ioctl(fd, EVIOCGABS(j * 8 + k), &abs) == 0) {
178                            printf(" : value %d, min %d, max %d, fuzz %d, flat %d, resolution %d",
179                                abs.value, abs.minimum, abs.maximum, abs.fuzz, abs.flat,
180                                abs.resolution);
181                        }
182                    }
183                    count++;
184                }
185        }
186        if(count)
187            printf("\n");
188    }
189    free(bits);
190    return 0;
191}
192
193static void print_event(int type, int code, int value, int print_flags)
194{
195    const char *type_label, *code_label, *value_label;
196
197    if (print_flags & PRINT_LABELS) {
198        type_label = get_label(ev_labels, type);
199        code_label = NULL;
200        value_label = NULL;
201
202        switch(type) {
203            case EV_SYN:
204                code_label = get_label(syn_labels, code);
205                break;
206            case EV_KEY:
207                code_label = get_label(key_labels, code);
208                value_label = get_label(key_value_labels, value);
209                break;
210            case EV_REL:
211                code_label = get_label(rel_labels, code);
212                break;
213            case EV_ABS:
214                code_label = get_label(abs_labels, code);
215                switch(code) {
216                    case ABS_MT_TOOL_TYPE:
217                        value_label = get_label(mt_tool_labels, value);
218                }
219                break;
220            case EV_MSC:
221                code_label = get_label(msc_labels, code);
222                break;
223            case EV_LED:
224                code_label = get_label(led_labels, code);
225                break;
226            case EV_SND:
227                code_label = get_label(snd_labels, code);
228                break;
229            case EV_SW:
230                code_label = get_label(sw_labels, code);
231                break;
232            case EV_REP:
233                code_label = get_label(rep_labels, code);
234                break;
235            case EV_FF:
236                code_label = get_label(ff_labels, code);
237                break;
238            case EV_FF_STATUS:
239                code_label = get_label(ff_status_labels, code);
240                break;
241        }
242
243        if (type_label)
244            printf("%-12.12s", type_label);
245        else
246            printf("%04x        ", type);
247        if (code_label)
248            printf(" %-20.20s", code_label);
249        else
250            printf(" %04x                ", code);
251        if (value_label)
252            printf(" %-20.20s", value_label);
253        else
254            printf(" %08x            ", value);
255    } else {
256        printf("%04x %04x %08x", type, code, value);
257    }
258}
259
260static void print_hid_descriptor(int bus, int vendor, int product)
261{
262    const char *dirname = "/sys/kernel/debug/hid";
263    char prefix[16];
264    DIR *dir;
265    struct dirent *de;
266    char filename[PATH_MAX];
267    FILE *file;
268    char line[2048];
269
270    snprintf(prefix, sizeof(prefix), "%04X:%04X:%04X.", bus, vendor, product);
271
272    dir = opendir(dirname);
273    if(dir == NULL)
274        return;
275    while((de = readdir(dir))) {
276        if (strstr(de->d_name, prefix) == de->d_name) {
277            snprintf(filename, sizeof(filename), "%s/%s/rdesc", dirname, de->d_name);
278
279            file = fopen(filename, "r");
280            if (file) {
281                printf("  HID descriptor: %s\n\n", de->d_name);
282                while (fgets(line, sizeof(line), file)) {
283                    fputs("    ", stdout);
284                    fputs(line, stdout);
285                }
286                fclose(file);
287                puts("");
288            }
289        }
290    }
291    closedir(dir);
292}
293
294static int open_device(const char *device, int print_flags)
295{
296    int version;
297    int fd;
298    struct pollfd *new_ufds;
299    char **new_device_names;
300    char name[80];
301    char location[80];
302    char idstr[80];
303    struct input_id id;
304
305    fd = open(device, O_RDWR);
306    if(fd < 0) {
307        if(print_flags & PRINT_DEVICE_ERRORS)
308            fprintf(stderr, "could not open %s, %s\n", device, strerror(errno));
309        return -1;
310    }
311
312    if(ioctl(fd, EVIOCGVERSION, &version)) {
313        if(print_flags & PRINT_DEVICE_ERRORS)
314            fprintf(stderr, "could not get driver version for %s, %s\n", device, strerror(errno));
315        return -1;
316    }
317    if(ioctl(fd, EVIOCGID, &id)) {
318        if(print_flags & PRINT_DEVICE_ERRORS)
319            fprintf(stderr, "could not get driver id for %s, %s\n", device, strerror(errno));
320        return -1;
321    }
322    name[sizeof(name) - 1] = '\0';
323    location[sizeof(location) - 1] = '\0';
324    idstr[sizeof(idstr) - 1] = '\0';
325    if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
326        //fprintf(stderr, "could not get device name for %s, %s\n", device, strerror(errno));
327        name[0] = '\0';
328    }
329    if(ioctl(fd, EVIOCGPHYS(sizeof(location) - 1), &location) < 1) {
330        //fprintf(stderr, "could not get location for %s, %s\n", device, strerror(errno));
331        location[0] = '\0';
332    }
333    if(ioctl(fd, EVIOCGUNIQ(sizeof(idstr) - 1), &idstr) < 1) {
334        //fprintf(stderr, "could not get idstring for %s, %s\n", device, strerror(errno));
335        idstr[0] = '\0';
336    }
337
338    new_ufds = realloc(ufds, sizeof(ufds[0]) * (nfds + 1));
339    if(new_ufds == NULL) {
340        fprintf(stderr, "out of memory\n");
341        return -1;
342    }
343    ufds = new_ufds;
344    new_device_names = realloc(device_names, sizeof(device_names[0]) * (nfds + 1));
345    if(new_device_names == NULL) {
346        fprintf(stderr, "out of memory\n");
347        return -1;
348    }
349    device_names = new_device_names;
350
351    if(print_flags & PRINT_DEVICE)
352        printf("add device %d: %s\n", nfds, device);
353    if(print_flags & PRINT_DEVICE_INFO)
354        printf("  bus:      %04x\n"
355               "  vendor    %04x\n"
356               "  product   %04x\n"
357               "  version   %04x\n",
358               id.bustype, id.vendor, id.product, id.version);
359    if(print_flags & PRINT_DEVICE_NAME)
360        printf("  name:     \"%s\"\n", name);
361    if(print_flags & PRINT_DEVICE_INFO)
362        printf("  location: \"%s\"\n"
363               "  id:       \"%s\"\n", location, idstr);
364    if(print_flags & PRINT_VERSION)
365        printf("  version:  %d.%d.%d\n",
366               version >> 16, (version >> 8) & 0xff, version & 0xff);
367
368    if(print_flags & PRINT_POSSIBLE_EVENTS) {
369        print_possible_events(fd, print_flags);
370    }
371
372    if(print_flags & PRINT_INPUT_PROPS) {
373        print_input_props(fd);
374    }
375    if(print_flags & PRINT_HID_DESCRIPTOR) {
376        print_hid_descriptor(id.bustype, id.vendor, id.product);
377    }
378
379    ufds[nfds].fd = fd;
380    ufds[nfds].events = POLLIN;
381    device_names[nfds] = strdup(device);
382    nfds++;
383
384    return 0;
385}
386
387int close_device(const char *device, int print_flags)
388{
389    int i;
390    for(i = 1; i < nfds; i++) {
391        if(strcmp(device_names[i], device) == 0) {
392            int count = nfds - i - 1;
393            if(print_flags & PRINT_DEVICE)
394                printf("remove device %d: %s\n", i, device);
395            free(device_names[i]);
396            memmove(device_names + i, device_names + i + 1, sizeof(device_names[0]) * count);
397            memmove(ufds + i, ufds + i + 1, sizeof(ufds[0]) * count);
398            nfds--;
399            return 0;
400        }
401    }
402    if(print_flags & PRINT_DEVICE_ERRORS)
403        fprintf(stderr, "remote device: %s not found\n", device);
404    return -1;
405}
406
407static int read_notify(const char *dirname, int nfd, int print_flags)
408{
409    int res;
410    char devname[PATH_MAX];
411    char *filename;
412    char event_buf[512];
413    int event_size;
414    int event_pos = 0;
415    struct inotify_event *event;
416
417    res = read(nfd, event_buf, sizeof(event_buf));
418    if(res < (int)sizeof(*event)) {
419        if(errno == EINTR)
420            return 0;
421        fprintf(stderr, "could not get event, %s\n", strerror(errno));
422        return 1;
423    }
424    //printf("got %d bytes of event information\n", res);
425
426    strcpy(devname, dirname);
427    filename = devname + strlen(devname);
428    *filename++ = '/';
429
430    while(res >= (int)sizeof(*event)) {
431        event = (struct inotify_event *)(event_buf + event_pos);
432        //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
433        if(event->len) {
434            strcpy(filename, event->name);
435            if(event->mask & IN_CREATE) {
436                open_device(devname, print_flags);
437            }
438            else {
439                close_device(devname, print_flags);
440            }
441        }
442        event_size = sizeof(*event) + event->len;
443        res -= event_size;
444        event_pos += event_size;
445    }
446    return 0;
447}
448
449static int scan_dir(const char *dirname, int print_flags)
450{
451    char devname[PATH_MAX];
452    char *filename;
453    DIR *dir;
454    struct dirent *de;
455    dir = opendir(dirname);
456    if(dir == NULL)
457        return -1;
458    strcpy(devname, dirname);
459    filename = devname + strlen(devname);
460    *filename++ = '/';
461    while((de = readdir(dir))) {
462        if(de->d_name[0] == '.' &&
463           (de->d_name[1] == '\0' ||
464            (de->d_name[1] == '.' && de->d_name[2] == '\0')))
465            continue;
466        strcpy(filename, de->d_name);
467        open_device(devname, print_flags);
468    }
469    closedir(dir);
470    return 0;
471}
472
473static void usage(int argc, char *argv[])
474{
475    fprintf(stderr, "Usage: %s [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-d] [-p] [-i] [-l] [-q] [-c count] [-r] [device]\n", argv[0]);
476    fprintf(stderr, "    -t: show time stamps\n");
477    fprintf(stderr, "    -n: don't print newlines\n");
478    fprintf(stderr, "    -s: print switch states for given bits\n");
479    fprintf(stderr, "    -S: print all switch states\n");
480    fprintf(stderr, "    -v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64)\n");
481    fprintf(stderr, "    -d: show HID descriptor, if available\n");
482    fprintf(stderr, "    -p: show possible events (errs, dev, name, pos. events)\n");
483    fprintf(stderr, "    -i: show all device info and possible events\n");
484    fprintf(stderr, "    -l: label event types and names in plain text\n");
485    fprintf(stderr, "    -q: quiet (clear verbosity mask)\n");
486    fprintf(stderr, "    -c: print given number of events then exit\n");
487    fprintf(stderr, "    -r: print rate events are received\n");
488}
489
490int getevent_main(int argc, char *argv[])
491{
492    int c;
493    int i;
494    int res;
495    int get_time = 0;
496    int print_device = 0;
497    char *newline = "\n";
498    uint16_t get_switch = 0;
499    struct input_event event;
500    int print_flags = 0;
501    int print_flags_set = 0;
502    int dont_block = -1;
503    int event_count = 0;
504    int sync_rate = 0;
505    int64_t last_sync_time = 0;
506    const char *device = NULL;
507    const char *device_path = "/dev/input";
508
509    opterr = 0;
510    do {
511        c = getopt(argc, argv, "tns:Sv::dpilqc:rh");
512        if (c == EOF)
513            break;
514        switch (c) {
515        case 't':
516            get_time = 1;
517            break;
518        case 'n':
519            newline = "";
520            break;
521        case 's':
522            get_switch = strtoul(optarg, NULL, 0);
523            if(dont_block == -1)
524                dont_block = 1;
525            break;
526        case 'S':
527            get_switch = ~0;
528            if(dont_block == -1)
529                dont_block = 1;
530            break;
531        case 'v':
532            if(optarg)
533                print_flags |= strtoul(optarg, NULL, 0);
534            else
535                print_flags |= PRINT_DEVICE | PRINT_DEVICE_NAME | PRINT_DEVICE_INFO | PRINT_VERSION;
536            print_flags_set = 1;
537            break;
538        case 'd':
539            print_flags |= PRINT_HID_DESCRIPTOR;
540            break;
541        case 'p':
542            print_flags |= PRINT_DEVICE_ERRORS | PRINT_DEVICE
543                    | PRINT_DEVICE_NAME | PRINT_POSSIBLE_EVENTS | PRINT_INPUT_PROPS;
544            print_flags_set = 1;
545            if(dont_block == -1)
546                dont_block = 1;
547            break;
548        case 'i':
549            print_flags |= PRINT_ALL_INFO;
550            print_flags_set = 1;
551            if(dont_block == -1)
552                dont_block = 1;
553            break;
554        case 'l':
555            print_flags |= PRINT_LABELS;
556            break;
557        case 'q':
558            print_flags_set = 1;
559            break;
560        case 'c':
561            event_count = atoi(optarg);
562            dont_block = 0;
563            break;
564        case 'r':
565            sync_rate = 1;
566            break;
567        case '?':
568            fprintf(stderr, "%s: invalid option -%c\n",
569                argv[0], optopt);
570        case 'h':
571            usage(argc, argv);
572            exit(1);
573        }
574    } while (1);
575    if(dont_block == -1)
576        dont_block = 0;
577
578    if (optind + 1 == argc) {
579        device = argv[optind];
580        optind++;
581    }
582    if (optind != argc) {
583        usage(argc, argv);
584        exit(1);
585    }
586    nfds = 1;
587    ufds = calloc(1, sizeof(ufds[0]));
588    ufds[0].fd = inotify_init();
589    ufds[0].events = POLLIN;
590    if(device) {
591        if(!print_flags_set)
592            print_flags |= PRINT_DEVICE_ERRORS;
593        res = open_device(device, print_flags);
594        if(res < 0) {
595            return 1;
596        }
597    } else {
598        if(!print_flags_set)
599            print_flags |= PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME;
600        print_device = 1;
601		res = inotify_add_watch(ufds[0].fd, device_path, IN_DELETE | IN_CREATE);
602        if(res < 0) {
603            fprintf(stderr, "could not add watch for %s, %s\n", device_path, strerror(errno));
604            return 1;
605        }
606        res = scan_dir(device_path, print_flags);
607        if(res < 0) {
608            fprintf(stderr, "scan dir failed for %s\n", device_path);
609            return 1;
610        }
611    }
612
613    if(get_switch) {
614        for(i = 1; i < nfds; i++) {
615            uint16_t sw;
616            res = ioctl(ufds[i].fd, EVIOCGSW(1), &sw);
617            if(res < 0) {
618                fprintf(stderr, "could not get switch state, %s\n", strerror(errno));
619                return 1;
620            }
621            sw &= get_switch;
622            printf("%04x%s", sw, newline);
623        }
624    }
625
626    if(dont_block)
627        return 0;
628
629    while(1) {
630        //int pollres =
631        poll(ufds, nfds, -1);
632        //printf("poll %d, returned %d\n", nfds, pollres);
633        if(ufds[0].revents & POLLIN) {
634            read_notify(device_path, ufds[0].fd, print_flags);
635        }
636        for(i = 1; i < nfds; i++) {
637            if(ufds[i].revents) {
638                if(ufds[i].revents & POLLIN) {
639                    res = read(ufds[i].fd, &event, sizeof(event));
640                    if(res < (int)sizeof(event)) {
641                        fprintf(stderr, "could not get event\n");
642                        return 1;
643                    }
644                    if(get_time) {
645                        printf("[%8ld.%06ld] ", event.time.tv_sec, event.time.tv_usec);
646                    }
647                    if(print_device)
648                        printf("%s: ", device_names[i]);
649                    print_event(event.type, event.code, event.value, print_flags);
650                    if(sync_rate && event.type == 0 && event.code == 0) {
651                        int64_t now = event.time.tv_sec * 1000000LL + event.time.tv_usec;
652                        if(last_sync_time)
653                            printf(" rate %lld", 1000000LL / (now - last_sync_time));
654                        last_sync_time = now;
655                    }
656                    printf("%s", newline);
657                    if(event_count && --event_count == 0)
658                        return 0;
659                }
660            }
661        }
662    }
663
664    return 0;
665}
666