测试Linux内核input事件——getevent源码
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getevent.c
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <stdint.h>#include <dirent.h>#include <fcntl.h>#include <sys/ioctl.h>#include <sys/inotify.h>//#include <sys/limits.h>#include <sys/poll.h>#include <linux/input.h>#include <errno.h>#include <time.h>#include "getevent.h"static struct pollfd *ufds;static char **device_names;static int nfds;enum { PRINT_DEVICE_ERRORS = 1U << 0, PRINT_DEVICE = 1U << 1, PRINT_DEVICE_NAME = 1U << 2, PRINT_DEVICE_INFO = 1U << 3, PRINT_VERSION = 1U << 4, PRINT_POSSIBLE_EVENTS = 1U << 5, PRINT_INPUT_PROPS = 1U << 6, PRINT_HID_DESCRIPTOR = 1U << 7, PRINT_ALL_INFO = (1U << 8) - 1, PRINT_LABELS = 1U << 16,};static const char *get_label(const struct label *labels, int value){ while(labels->name && value != labels->value) { labels++; } return labels->name;}static int print_input_props(int fd){ uint8_t bits[INPUT_PROP_CNT / 8]; int i, j; int res; int count; const char *bit_label; printf(" input props:\n"); res = ioctl(fd, EVIOCGPROP(sizeof(bits)), bits); if(res < 0) { printf(" <not available\n"); return 1; } count = 0; for(i = 0; i < res; i++) { for(j = 0; j < 8; j++) { if (bits[i] & 1 << j) { bit_label = get_label(input_prop_labels, i * 8 + j); if(bit_label) printf(" %s\n", bit_label); else printf(" %04x\n", i * 8 + j); count++; } } } if (!count) printf(" <none>\n"); return 0;}static int print_possible_events(int fd, int print_flags){ uint8_t *bits = NULL; ssize_t bits_size = 0; const char* label; int i, j, k; int res, res2; struct label* bit_labels; const char *bit_label; printf(" events:\n"); for(i = EV_KEY; i <= EV_MAX; i++) { // skip EV_SYN since we cannot query its available codes int count = 0; while(1) { res = ioctl(fd, EVIOCGBIT(i, bits_size), bits); if(res < bits_size) break; bits_size = res + 16; bits = realloc(bits, bits_size * 2); if(bits == NULL) { fprintf(stderr, "failed to allocate buffer of size %d\n", (int)bits_size); return 1; } } res2 = 0; switch(i) { case EV_KEY: res2 = ioctl(fd, EVIOCGKEY(res), bits + bits_size); label = "KEY"; bit_labels = key_labels; break; case EV_REL: label = "REL"; bit_labels = rel_labels; break; case EV_ABS: label = "ABS"; bit_labels = abs_labels; break; case EV_MSC: label = "MSC"; bit_labels = msc_labels; break; case EV_LED: res2 = ioctl(fd, EVIOCGLED(res), bits + bits_size); label = "LED"; bit_labels = led_labels; break; case EV_SND: res2 = ioctl(fd, EVIOCGSND(res), bits + bits_size); label = "SND"; bit_labels = snd_labels; break; case EV_SW: res2 = ioctl(fd, EVIOCGSW(bits_size), bits + bits_size); label = "SW "; bit_labels = sw_labels; break; case EV_REP: label = "REP"; bit_labels = rep_labels; break; case EV_FF: label = "FF "; bit_labels = ff_labels; break; case EV_PWR: label = "PWR"; bit_labels = NULL; break; case EV_FF_STATUS: label = "FFS"; bit_labels = ff_status_labels; break; default: res2 = 0; label = "???"; bit_labels = NULL; } for(j = 0; j < res; j++) { for(k = 0; k < 8; k++) if(bits[j] & 1 << k) { char down; if(j < res2 && (bits[j + bits_size] & 1 << k)) down = '*'; else down = ' '; if(count == 0) printf(" %s (%04x):", label, i); else if((count & (print_flags & PRINT_LABELS ? 0x3 : 0x7)) == 0 || i == EV_ABS) printf("\n "); if(bit_labels && (print_flags & PRINT_LABELS)) { bit_label = get_label(bit_labels, j * 8 + k); if(bit_label) printf(" %.20s%c%*s", bit_label, down, (int) (20 - strlen(bit_label)), ""); else printf(" %04x%c ", j * 8 + k, down); } else { printf(" %04x%c", j * 8 + k, down); } if(i == EV_ABS) { struct input_absinfo abs; if(ioctl(fd, EVIOCGABS(j * 8 + k), &abs) == 0) { printf(" : value %d, min %d, max %d, fuzz %d, flat %d, resolution %d", abs.value, abs.minimum, abs.maximum, abs.fuzz, abs.flat, abs.resolution); } } count++; } } if(count) printf("\n"); } free(bits); return 0;}static void print_event(int type, int code, int value, int print_flags){ const char *type_label, *code_label, *value_label; if (print_flags & PRINT_LABELS) { type_label = get_label(ev_labels, type); code_label = NULL; value_label = NULL; switch(type) { case EV_SYN: code_label = get_label(syn_labels, code); break; case EV_KEY: code_label = get_label(key_labels, code); value_label = get_label(key_value_labels, value); break; case EV_REL: code_label = get_label(rel_labels, code); break; case EV_ABS: code_label = get_label(abs_labels, code); switch(code) { case ABS_MT_TOOL_TYPE: value_label = get_label(mt_tool_labels, value); } break; case EV_MSC: code_label = get_label(msc_labels, code); break; case EV_LED: code_label = get_label(led_labels, code); break; case EV_SND: code_label = get_label(snd_labels, code); break; case EV_SW: code_label = get_label(sw_labels, code); break; case EV_REP: code_label = get_label(rep_labels, code); break; case EV_FF: code_label = get_label(ff_labels, code); break; case EV_FF_STATUS: code_label = get_label(ff_status_labels, code); break; } if (type_label) printf("%-12.12s", type_label); else printf("%04x ", type); if (code_label) printf(" %-20.20s", code_label); else printf(" %04x ", code); if (value_label) printf(" %-20.20s", value_label); else printf(" %08x ", value); } else { printf("%04x %04x %08x", type, code, value); }}static void print_hid_descriptor(int bus, int vendor, int product){ const char *dirname = "/sys/kernel/debug/hid"; char prefix[16]; DIR *dir; struct dirent *de; char filename[PATH_MAX]; FILE *file; char line[2048]; snprintf(prefix, sizeof(prefix), "%04X:%04X:%04X.", bus, vendor, product); dir = opendir(dirname); if(dir == NULL) return; while((de = readdir(dir))) { if (strstr(de->d_name, prefix) == de->d_name) { snprintf(filename, sizeof(filename), "%s/%s/rdesc", dirname, de->d_name); file = fopen(filename, "r"); if (file) { printf(" HID descriptor: %s\n\n", de->d_name); while (fgets(line, sizeof(line), file)) { fputs(" ", stdout); fputs(line, stdout); } fclose(file); puts(""); } } } closedir(dir);}static int open_device(const char *device, int print_flags){ int version; int fd; int clkid = CLOCK_MONOTONIC; struct pollfd *new_ufds; char **new_device_names; char name[80]; char location[80]; char idstr[80]; struct input_id id; fd = open(device, O_RDWR); if(fd < 0) { if(print_flags & PRINT_DEVICE_ERRORS) fprintf(stderr, "could not open %s, %s\n", device, strerror(errno)); return -1; } if(ioctl(fd, EVIOCGVERSION, &version)) { if(print_flags & PRINT_DEVICE_ERRORS) fprintf(stderr, "could not get driver version for %s, %s\n", device, strerror(errno)); return -1; } if(ioctl(fd, EVIOCGID, &id)) { if(print_flags & PRINT_DEVICE_ERRORS) fprintf(stderr, "could not get driver id for %s, %s\n", device, strerror(errno)); return -1; } name[sizeof(name) - 1] = '\0'; location[sizeof(location) - 1] = '\0'; idstr[sizeof(idstr) - 1] = '\0'; if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) { //fprintf(stderr, "could not get device name for %s, %s\n", device, strerror(errno)); name[0] = '\0'; } if(ioctl(fd, EVIOCGPHYS(sizeof(location) - 1), &location) < 1) { //fprintf(stderr, "could not get location for %s, %s\n", device, strerror(errno)); location[0] = '\0'; } if(ioctl(fd, EVIOCGUNIQ(sizeof(idstr) - 1), &idstr) < 1) { //fprintf(stderr, "could not get idstring for %s, %s\n", device, strerror(errno)); idstr[0] = '\0'; } if (ioctl(fd, EVIOCSCLOCKID, &clkid) != 0) { fprintf(stderr, "Can't enable monotonic clock reporting: %s\n", strerror(errno)); // a non-fatal error } new_ufds = realloc(ufds, sizeof(ufds[0]) * (nfds + 1)); if(new_ufds == NULL) { fprintf(stderr, "out of memory\n"); return -1; } ufds = new_ufds; new_device_names = realloc(device_names, sizeof(device_names[0]) * (nfds + 1)); if(new_device_names == NULL) { fprintf(stderr, "out of memory\n"); return -1; } device_names = new_device_names; if(print_flags & PRINT_DEVICE) printf("add device %d: %s\n", nfds, device); if(print_flags & PRINT_DEVICE_INFO) printf(" bus: %04x\n" " vendor %04x\n" " product %04x\n" " version %04x\n", id.bustype, id.vendor, id.product, id.version); if(print_flags & PRINT_DEVICE_NAME) printf(" name: \"%s\"\n", name); if(print_flags & PRINT_DEVICE_INFO) printf(" location: \"%s\"\n" " id: \"%s\"\n", location, idstr); if(print_flags & PRINT_VERSION) printf(" version: %d.%d.%d\n", version >> 16, (version >> 8) & 0xff, version & 0xff); if(print_flags & PRINT_POSSIBLE_EVENTS) { print_possible_events(fd, print_flags); } if(print_flags & PRINT_INPUT_PROPS) { print_input_props(fd); } if(print_flags & PRINT_HID_DESCRIPTOR) { print_hid_descriptor(id.bustype, id.vendor, id.product); } ufds[nfds].fd = fd; ufds[nfds].events = POLLIN; device_names[nfds] = strdup(device); nfds++; return 0;}int close_device(const char *device, int print_flags){ int i; for(i = 1; i < nfds; i++) { if(strcmp(device_names[i], device) == 0) { int count = nfds - i - 1; if(print_flags & PRINT_DEVICE) printf("remove device %d: %s\n", i, device); free(device_names[i]); memmove(device_names + i, device_names + i + 1, sizeof(device_names[0]) * count); memmove(ufds + i, ufds + i + 1, sizeof(ufds[0]) * count); nfds--; return 0; } } if(print_flags & PRINT_DEVICE_ERRORS) fprintf(stderr, "remote device: %s not found\n", device); return -1;}static int read_notify(const char *dirname, int nfd, int print_flags){ int res; char devname[PATH_MAX]; char *filename; char event_buf[512]; int event_size; int event_pos = 0; struct inotify_event *event; res = read(nfd, event_buf, sizeof(event_buf)); if(res < (int)sizeof(*event)) { if(errno == EINTR) return 0; fprintf(stderr, "could not get event, %s\n", strerror(errno)); return 1; } //printf("got %d bytes of event information\n", res); strcpy(devname, dirname); filename = devname + strlen(devname); *filename++ = '/'; while(res >= (int)sizeof(*event)) { event = (struct inotify_event *)(event_buf + event_pos); //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : ""); if(event->len) { strcpy(filename, event->name); if(event->mask & IN_CREATE) { open_device(devname, print_flags); } else { close_device(devname, print_flags); } } event_size = sizeof(*event) + event->len; res -= event_size; event_pos += event_size; } return 0;}static int scan_dir(const char *dirname, int print_flags){ char devname[PATH_MAX]; char *filename; DIR *dir; struct dirent *de; dir = opendir(dirname); if(dir == NULL) return -1; strcpy(devname, dirname); filename = devname + strlen(devname); *filename++ = '/'; while((de = readdir(dir))) { if(de->d_name[0] == '.' && (de->d_name[1] == '\0' || (de->d_name[1] == '.' && de->d_name[2] == '\0'))) continue; strcpy(filename, de->d_name); open_device(devname, print_flags); } closedir(dir); return 0;}static void usage(char *name){ fprintf(stderr, "Usage: %s [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-d] [-p] [-i] [-l] [-q] [-c count] [-r] [device]\n", name); fprintf(stderr, " -t: show time stamps\n"); fprintf(stderr, " -n: don't print newlines\n"); fprintf(stderr, " -s: print switch states for given bits\n"); fprintf(stderr, " -S: print all switch states\n"); fprintf(stderr, " -v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64)\n"); fprintf(stderr, " -d: show HID descriptor, if available\n"); fprintf(stderr, " -p: show possible events (errs, dev, name, pos. events)\n"); fprintf(stderr, " -i: show all device info and possible events\n"); fprintf(stderr, " -l: label event types and names in plain text\n"); fprintf(stderr, " -q: quiet (clear verbosity mask)\n"); fprintf(stderr, " -c: print given number of events then exit\n"); fprintf(stderr, " -r: print rate events are received\n");}int main(int argc, char *argv[]){ int c; int i; int res; int get_time = 0; int print_device = 0; char *newline = "\n"; uint16_t get_switch = 0; struct input_event event; int print_flags = 0; int print_flags_set = 0; int dont_block = -1; int event_count = 0; int sync_rate = 0; int64_t last_sync_time = 0; const char *device = NULL; const char *device_path = "/dev/input"; int opterr = 0; do { c = getopt(argc, argv, "tns:Sv::dpilqc:rh"); if (c == EOF) break; switch (c) { case 't': get_time = 1; break; case 'n': newline = ""; break; case 's': //get_switch = strtoul(optarg, NULL, 0); if(dont_block == -1) dont_block = 1; break; case 'S': get_switch = ~0; if(dont_block == -1) dont_block = 1; break; case 'v': //if(optarg) // print_flags |= strtoul(optarg, NULL, 0); //else // print_flags |= PRINT_DEVICE | PRINT_DEVICE_NAME | PRINT_DEVICE_INFO | PRINT_VERSION; //print_flags_set = 1; break; case 'd': print_flags |= PRINT_HID_DESCRIPTOR; break; case 'p': print_flags |= PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME | PRINT_POSSIBLE_EVENTS | PRINT_INPUT_PROPS; print_flags_set = 1; if(dont_block == -1) dont_block = 1; break; case 'i': print_flags |= PRINT_ALL_INFO; print_flags_set = 1; if(dont_block == -1) dont_block = 1; break; case 'l': print_flags |= PRINT_LABELS; break; case 'q': print_flags_set = 1; break; case 'c': //event_count = atoi(optarg); dont_block = 0; break; case 'r': sync_rate = 1; break; case '?': //fprintf(stderr, "%s: invalid option -%c\n", //argv[0], optopt); case 'h': usage(argv[0]); exit(1); } } while (1); if(dont_block == -1) dont_block = 0; //if (optind + 1 == argc) { // device = argv[optind]; // optind++; //} //if (optind != argc) { // usage(argv[0]); // exit(1); //} nfds = 1; ufds = calloc(1, sizeof(ufds[0])); ufds[0].fd = inotify_init(); ufds[0].events = POLLIN; if(device) { if(!print_flags_set) print_flags |= PRINT_DEVICE_ERRORS; res = open_device(device, print_flags); if(res < 0) { return 1; } } else { if(!print_flags_set) print_flags |= PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME; print_device = 1; res = inotify_add_watch(ufds[0].fd, device_path, IN_DELETE | IN_CREATE); if(res < 0) { fprintf(stderr, "could not add watch for %s, %s\n", device_path, strerror(errno)); return 1; } res = scan_dir(device_path, print_flags); if(res < 0) { fprintf(stderr, "scan dir failed for %s\n", device_path); return 1; } } if(get_switch) { for(i = 1; i < nfds; i++) { uint16_t sw; res = ioctl(ufds[i].fd, EVIOCGSW(1), &sw); if(res < 0) { fprintf(stderr, "could not get switch state, %s\n", strerror(errno)); return 1; } sw &= get_switch; printf("%04x%s", sw, newline); } } if(dont_block) return 0; while(1) { //int pollres = poll(ufds, nfds, -1); //printf("poll %d, returned %d\n", nfds, pollres); if(ufds[0].revents & POLLIN) { read_notify(device_path, ufds[0].fd, print_flags); } for(i = 1; i < nfds; i++) { if(ufds[i].revents) { if(ufds[i].revents & POLLIN) { res = read(ufds[i].fd, &event, sizeof(event)); if(res < (int)sizeof(event)) { fprintf(stderr, "could not get event\n"); return 1; } if(get_time) { printf("[%8ld.%06ld] ", event.time.tv_sec, event.time.tv_usec); } if(print_device) printf("%s: ", device_names[i]); print_event(event.type, event.code, event.value, print_flags); if(sync_rate && event.type == 0 && event.code == 0) { int64_t now = event.time.tv_sec * 1000000LL + event.time.tv_usec; if(last_sync_time) printf(" rate %lld", 1000000LL / (now - last_sync_time)); last_sync_time = now; } printf("%s", newline); if(event_count && --event_count == 0) return 0; } } } } return 0;} 1 0
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