Function open_evdev

src/library/inputs/evdev.cpp:55–96

}

int open_evdev(const char* source, int flags)
{
    /* Extract the ev number from the dev filename */
    int evnum;
    int ret = sscanf(source, "/dev/input/event%d", &evnum);
    if (ret != 1) {
        errno = ENOENT;
        return -1;
    }

    /* Return -1 and set errno if we don't support this ev number */
    if (evnum < 0 || evnum >= Global::shared_config.nb_controllers || evnum >= AllInputsFlat::MAXJOYS) {
        errno = ENOENT;
        return -1;
    }

    LOG(LL_DEBUG, LCF_JOYSTICK, "   evdev device %d detected", evnum);

    if (evdevfds[evnum].second++ == 0) {
        /* Register that we use EVDEV for joystick inputs */
        Global::game_info.joystick |= GameInfo::EVDEV;
        Global::game_info.tosend = true;

        if (flags == O_RDWR) {
            LOG(LL_DEBUG, LCF_JOYSTICK, "   evdev device was opened with read/write, but we only support read. Enforcing this may be an issue later");
            flags = O_RDONLY;
        }

        /* Create an unnamed pipe. */
        evdevfds[evnum].first = FileHandleList::createPipe(flags);
        
        /* If pipe creation failed (e.g. when opening the dev file in write mode),
         * invalidate the pipe and return -1. */
        if (evdevfds[evnum].first.first == -1) {
            LOG(LL_DEBUG, LCF_JOYSTICK, "   could not create evdev pipe with flags %d", flags);
            evdevfds[evnum].second = 0;
            return -1;
        }
    }

    return evdevfds[evnum].first.first;
}

void write_evdev(struct input_event ev, int evnum)
{