C++ (Cpp) netlink_message_parse примеры использования

Пример #1

Файл: android_netlink.c Проект: CGmaybe10/UVCCamera

/* parse parts of netlink message common to both libudev and the kernel */
static int linux_netlink_parse(char *buffer, size_t len, int *detached, const char **sys_name,
                               uint8_t *busnum, uint8_t *devaddr) {
    const char *tmp;
    int i;

    errno = 0;

    *sys_name = NULL;
    *detached = 0;
    *busnum   = 0;
    *devaddr  = 0;

    tmp = netlink_message_parse((const char *) buffer, len, "ACTION");
    if (tmp == NULL)
        return -1;
    if (0 == strcmp(tmp, "remove")) {
        *detached = 1;
    } else if (0 == strcmp(tmp, "add")) {
        // pass through
    } else if (0 != strcmp(tmp, "change")) {
        usbi_dbg("unknown device action [%s]", tmp);
        return -1;
    }

    /* check that this is a usb message */
    tmp = netlink_message_parse(buffer, len, "SUBSYSTEM");
    if (NULL == tmp || 0 != strcmp(tmp, "usb")) {
        /* not usb. ignore */
        return -1;
    }

    tmp = netlink_message_parse(buffer, len, "BUSNUM");
    if (NULL == tmp) {
        /* no bus number. try "DEVICE" */
        tmp = netlink_message_parse(buffer, len, "DEVICE");
        if (NULL == tmp) {
            /* not usb. ignore */
            return -1;
        }

        /* Parse a device path such as /dev/bus/usb/003/004 */
        char *pLastSlash = (char*)strrchr(tmp,'/');
        if(NULL == pLastSlash) {
            return -1;
        }

        *devaddr = strtoul(pLastSlash + 1, NULL, 10);
        if (errno) {
            errno = 0;
            return -1;
        }

        *busnum = strtoul(pLastSlash - 3, NULL, 10);
        if (errno) {
            errno = 0;
            return -1;
        }

        return 0;
    }

    *busnum = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
    if (errno) {
        errno = 0;
        return -1;
    }

    tmp = netlink_message_parse(buffer, len, "DEVNUM");
    if (NULL == tmp) {
        return -1;
    }

    *devaddr = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
    if (errno) {
        errno = 0;
        return -1;
    }

    tmp = netlink_message_parse(buffer, len, "DEVPATH");
    if (NULL == tmp) {
        return -1;
    }

    for (i = strlen(tmp) - 1 ; i ; --i) {
        if ('/' ==tmp[i]) {
            *sys_name = tmp + i + 1;
            break;
        }
    }

    /* found a usb device */
    return 0;
}

Пример #2

Файл: linux_netlink.c Проект: TaoheGit/hmi_sdl_android

/* parse parts of netlink message common to both libudev and the kernel */
static int linux_netlink_parse(char *buffer, size_t len, int *detached, const char **sys_name,
			       uint8_t *busnum, uint8_t *devaddr) {
	const char *tmp;
	int i;

	errno = 0;

	*sys_name = NULL;
	*detached = 0;
	*busnum   = 0;
	*devaddr  = 0;

	tmp = netlink_message_parse((const char *) buffer, len, "ACTION");
	if (tmp == NULL)
		return -1;
	if (0 == strcmp(tmp, "remove")) {
		*detached = 1;
	} else if (0 != strcmp(tmp, "add")) {
		usbi_dbg("unknown device action %s", tmp);
		return -1;
	}

	/* check that this is a usb message */
	tmp = netlink_message_parse(buffer, len, "SUBSYSTEM");
	if (NULL == tmp || 0 != strcmp(tmp, "usb")) {
		/* not usb. ignore */
		return -1;
	}

	tmp = netlink_message_parse(buffer, len, "BUSNUM");
	if (NULL == tmp) {
		/* no bus number (likely a usb interface). ignore*/
		return -1;
	}

	*busnum = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
	if (errno) {
		errno = 0;
		return -1;
	}

	tmp = netlink_message_parse(buffer, len, "DEVNUM");
	if (NULL == tmp) {
		return -1;
	}

	*devaddr = (uint8_t)(strtoul(tmp, NULL, 10) & 0xff);
	if (errno) {
		errno = 0;
		return -1;
	}

	tmp = netlink_message_parse(buffer, len, "DEVPATH");
	if (NULL == tmp) {
		return -1;
	}

	for (i = strlen(tmp) - 1 ; i ; --i) {
		if ('/' ==tmp[i]) {
			*sys_name = tmp + i + 1;
			break;
		}
	}

	/* found a usb device */
	return 0;
}