103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <string.h>
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#include <fcntl.h>
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#include <dirent.h>
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#define NOKEY 0
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#define DEV_INPUT_EVENT "/dev/input"
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#define EVENT_DEV_NAME "event"
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static int stop = 0;
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static int is_event_device(const struct dirent *dir) {
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return strncmp(EVENT_DEV_NAME, dir->d_name, 5) == 0;
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}
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static char* scan_devices(void)
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{
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struct dirent **namelist;
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int i, ndev, devnum;
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char *filename;
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int max_device = 0;
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ndev = scandir(DEV_INPUT_EVENT, &namelist, is_event_device, alphasort);
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if (ndev <= 0)
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return NULL;
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fprintf(stderr, "Available devices:\n");
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for (i = 0; i < ndev; i++)
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{
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char fname[64];
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int fd = -1;
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char name[256] = "???";
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snprintf(fname, sizeof(fname),
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"%s/%s", DEV_INPUT_EVENT, namelist[i]->d_name);
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fd = open(fname, O_RDONLY);
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if (fd < 0)
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continue;
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ioctl(fd, EVIOCGNAME(sizeof(name)), name);
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close(fd);
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if (strncmp(name, "adc-keys", strlen("adc-keys")) != 0)
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continue;
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fprintf(stderr, "%s: %s\n", fname, name);
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sscanf(namelist[i]->d_name, "event%d", &devnum);
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if (devnum > max_device)
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max_device = devnum;
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free(namelist[i]);
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}
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if (devnum > max_device || devnum < 0)
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return NULL;
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asprintf(&filename, "%s/%s%d",
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DEV_INPUT_EVENT, EVENT_DEV_NAME,
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devnum);
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return filename;
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}
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int main(int argc, const char *argv[])
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{
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int keys_fd;
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struct input_event t;
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setvbuf(stdout, (char *)NULL, _IONBF, 0);//disable stdio out buffer;
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char *event_name = scan_devices();
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if (!event_name)
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return -1;
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keys_fd = open(event_name, O_RDONLY);
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if(keys_fd<=0)
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{
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printf("open %s device error!\n", event_name);
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return 0;
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}
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while(1)
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{
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if(read(keys_fd,&t,sizeof(t))==sizeof(t)) {
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if(t.type==EV_KEY)
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if(t.value==0 || t.value==1)
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{
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printf("key%d %s\n",t.code, (t.value)?"Presse":"Released");
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}
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}
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}
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close(keys_fd);
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return 0;
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}
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