vkey.c

// http://www.tatapa.org/~takuo/input_subsystem/input_subsystem.html
// virtual key event
// sudo sh -c "./a.out keycode > /dev/input/eventX"
// 30 == KEY_A
// 41 == KEY_GRAVE (zenkaku hankaku)

#include <linux/input.h>    // see for keycode constant KEY_XXX
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

#define KEYRELEASE 0
#define KEYPRESS 1

void write_key_event(int code, int value, int fd)
{
    struct input_event key_event;

    gettimeofday(&key_event.time, NULL);
    key_event.type = EV_KEY;
    key_event.code = code;
    key_event.value = value;
    write(fd, &key_event, sizeof(key_event));
}

int main(int argc, char **argv)
{
    int i;
    int code;

    for (i = 1; i < argc; ++i) {
        sscanf(argv[i], "%i", &code);
        write_key_event(code, KEYPRESS, STDOUT_FILENO);
        write_key_event(code, KEYRELEASE, STDOUT_FILENO);
    }

    return 0;
}