systemd-stable/udev/lib/test-libudev.c

/*
 * test-libudev
 *
 * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/select.h>

#include "libudev.h"

static void log_fn(struct udev *udev,
		   int priority, const char *file, int line, const char *fn,
		   const char *format, va_list args)
{
	printf("test-libudev: %s %s:%d ", fn, file, line);
	vprintf(format, args);
}

static int print_devlinks_cb(struct udev_device *udev_device, const char *value, void *data)
{
	printf("link:      '%s'\n", value);
	return 0;
}

static int print_properties_cb(struct udev_device *udev_device, const char *key, const char *value, void *data)
{
	printf("property:  '%s=%s'\n", key, value);
	return 0;
}

static void print_device(struct udev_device *device)
{
	const char *str;
	int count;

	printf("*** device: %p ***\n", device);
	str = udev_device_get_devpath(device);
	printf("devpath:   '%s'\n", str);
	str = udev_device_get_subsystem(device);
	printf("subsystem: '%s'\n", str);
	str = udev_device_get_syspath(device);
	printf("syspath:   '%s'\n", str);
	str = udev_device_get_devname(device);
	printf("devname:   '%s'\n", str);
	count = udev_device_get_devlinks(device, print_devlinks_cb, NULL);
	printf("found %i links\n", count);
	count = udev_device_get_properties(device, print_properties_cb, NULL);
	printf("found %i properties\n", count);
	printf("\n");
}

static int test_device(struct udev *udev, const char *devpath)
{
	struct udev_device *device;

	printf("looking at device: %s\n", devpath);
	device = udev_device_new_from_devpath(udev, devpath);
	if (device == NULL) {
		printf("no device\n");
		return -1;
	}
	print_device(device);
	udev_device_unref(device);
	return 0;
}

static int devices_enum_cb(struct udev *udev,
			   const char *devpath, const char *subsystem, const char *name,
			   void *data)
{
	printf("device:    '%s' (%s) '%s'\n", devpath, subsystem, name);
	return 0;
}

static int test_enumerate(struct udev *udev, const char *subsystem)
{
	int count;

	count = udev_devices_enumerate(udev, subsystem, devices_enum_cb, NULL);
	printf("found %i devices\n\n", count);
	return count;
}

static int test_monitor(struct udev *udev, const char *socket_path)
{
	struct udev_monitor *udev_monitor;
	fd_set readfds;
	int fd;

	udev_monitor = udev_monitor_new_from_socket(udev, socket_path);
	if (udev_monitor == NULL) {
		printf("no socket\n");
		return -1;
	}
	if (udev_monitor_enable_receiving(udev_monitor) < 0) {
		printf("bind failed\n");
		return -1;
	}

	fd = udev_monitor_get_fd(udev_monitor);
	FD_ZERO(&readfds);

	while (1) {
		struct udev_device *device;
		int fdcount;

		FD_SET(STDIN_FILENO, &readfds);
		FD_SET(fd, &readfds);

		printf("waiting for events on %s, press ENTER to exit\n", socket_path);
		fdcount = select(fd+1, &readfds, NULL, NULL, NULL);
		printf("select fd count: %i\n", fdcount);

		if (FD_ISSET(fd, &readfds)) {
			device = udev_monitor_receive_device(udev_monitor);
			if (device == NULL) {
				printf("no device from socket\n");
				continue;
			}
			print_device(device);
			udev_device_unref(device);
		}

		if (FD_ISSET(STDIN_FILENO, &readfds)) {
			printf("exiting loop\n");
			break;
		}
	}

	udev_monitor_unref(udev_monitor);
	return 0;
}

int main(int argc, char *argv[], char *envp[])
{
	struct udev *udev;
	const char *devpath = "/devices/virtual/mem/null";
	const char *subsystem = NULL;
	const char *socket = "@/org/kernel/udev/monitor";
	const char *str;

	if (argv[1] != NULL) {
		devpath = argv[1];
		if (argv[2] != NULL)
			subsystem = argv[2];
			if (argv[3] != NULL)
				socket = argv[3];
	}

	udev = udev_new();
	printf("context: %p\n", udev);
	if (udev == NULL) {
		printf("no context\n");
		return 1;
	}
	udev_set_log_fn(udev, log_fn);
	printf("set log: %p\n", log_fn);

	str = udev_get_sys_path(udev);
	printf("sys_path: '%s'\n", str);
	str = udev_get_dev_path(udev);
	printf("dev_path: '%s'\n", str);

	test_device(udev, devpath);
	test_enumerate(udev, subsystem);
	test_monitor(udev, socket);

	udev_unref(udev);
	return 0;
}