linux下getevent
来源：互联网 发布：杨百万软件多少钱 编辑：程序博客网 时间：2024/05/01 16:59
从android拿过来的getevent，到linux上能使。
执行需要root权限哦。
#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 <limits.h>#include <sys/poll.h>#include <linux/input.h> // this does not compile#include <errno.h>#include <unistd.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,};static int print_possible_events(int fd){ uint8_t *bits = NULL; ssize_t bits_size = 0; const char* label; int i, j, k; int res, res2; printf(" events:\n"); for(i = 0; i <= EV_MAX; i++) { 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", bits_size); return 1; } } res2 = 0; switch(i) { case EV_SYN: label = "SYN"; break; case EV_KEY: res2 = ioctl(fd, EVIOCGKEY(res), bits + bits_size); label = "KEY"; break; case EV_REL: label = "REL"; break; case EV_ABS: label = "ABS"; break; case EV_MSC: label = "MSC"; break; case EV_LED: res2 = ioctl(fd, EVIOCGLED(res), bits + bits_size); label = "LED"; break; case EV_SND: res2 = ioctl(fd, EVIOCGSND(res), bits + bits_size); label = "SND"; break; case EV_SW: res2 = ioctl(fd, EVIOCGSW(bits_size), bits + bits_size); label = "SW "; break; case EV_REP: label = "REP"; break; case EV_FF: label = "FF "; break; case EV_PWR: label = "PWR"; break; default: res2 = 0; label = "???"; } 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 & 0x7) == 0 || i == EV_ABS) printf("\n "); 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", abs.value, abs.minimum, abs.maximum, abs.fuzz, abs.flat); } } count++; } } if(count) printf("\n"); } free(bits); return 0;}static int open_device(const char *device, int print_flags){ int version; int fd; 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'; } 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); } 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(int argc, char *argv[]){ fprintf(stderr, "Usage: %s [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-p] [-q] [-c count] [-r] [device]\n", argv[0]); 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)\n"); fprintf(stderr, " -p: show possible events (errs, dev, name, pos. events)\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 pollres; int get_time = 0; int print_device = 0; char *newline = "\n"; uint16_t get_switch = 0; struct input_event event; int version; int print_flags = PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME; 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"; opterr = 0; do { c = getopt(argc, argv, "tns:Sv::pqc: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 'p': print_flags = PRINT_DEVICE_ERRORS | PRINT_DEVICE | PRINT_DEVICE_NAME | PRINT_POSSIBLE_EVENTS; print_flags_set = 1; if(dont_block == -1) dont_block = 1; break; case 'q': print_flags = 0; 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(argc, argv); exit(1); } } while (1); if(dont_block == -1) dont_block = 0; if (optind + 1 == argc) { device = argv[optind]; optind++; } if (optind != argc) { usage(argc, argv); 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 { 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) { 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("%ld-%ld: ", event.time.tv_sec, event.time.tv_usec); } if(print_device) printf("%s: ", device_names[i]); printf("%04x %04x %08x", event.type, event.code, event.value); 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;} 0 0
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