c 捕捉键盘事件linux

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>

int main() {
    int fd = open("/dev/input/event0", O_RDONLY);
    if (fd == -1) {
        perror("Cannot open input device");
        return 1;
    }

    struct input_event ev;
    while (1) {
        ssize_t n = read(fd, &ev, sizeof(ev));
        if (n == (ssize_t)-1) {
            perror("Error reading from input device");
            break;
        }
        if (n != sizeof(ev)) {
            fprintf(stderr, "Unexpected partial read\n");
            continue;
        }

        if (ev.type == EV_KEY) {
            printf("Key %i %s\n", ev.code, ev.value ? "pressed" : "released");
        }
    }

    close(fd);
    return 0;
}

int flags = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);