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/*
* Copyright (C) 2004-2008 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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include "udev.h"
static int udev_exit;
static void asmlinkage sig_handler(int signum)
{
if (signum == SIGINT || signum == SIGTERM)
udev_exit = 1;
}
static int print_properties_cb(struct udev_device *udev_device, const char *key, const char *value, void *data)
{
printf("%s=%s\n", key, value);
return 0;
}
static void print_properties(struct udev_device *device)
{
udev_device_get_properties(device, print_properties_cb, NULL);
printf("\n");
}
int udevadm_monitor(struct udev *udev, int argc, char *argv[])
{
struct sigaction act;
int option;
int env = 0;
int print_kernel = 0;
int print_udev = 0;
struct udev_monitor *udev_monitor = NULL;
struct udev_monitor *kernel_monitor = NULL;
fd_set readfds;
int rc = 0;
static const struct option options[] = {
{ "environment", 0, NULL, 'e' },
{ "kernel", 0, NULL, 'k' },
{ "udev", 0, NULL, 'u' },
{ "help", 0, NULL, 'h' },
{}
};
while (1) {
option = getopt_long(argc, argv, "ekuh", options, NULL);
if (option == -1)
break;
switch (option) {
case 'e':
env = 1;
break;
case 'k':
print_kernel = 1;
break;
case 'u':
print_udev = 1;
break;
case 'h':
printf("Usage: udevadm monitor [--environment] [--kernel] [--udev] [--help]\n"
" --env print the whole event environment\n"
" --kernel print kernel uevents\n"
" --udev print udev events\n"
" --help print this help text\n\n");
default:
goto out;
}
}
if (!print_kernel && !print_udev) {
print_kernel = 1;
print_udev =1;
}
if (getuid() != 0 && print_kernel) {
fprintf(stderr, "root privileges needed to subscribe to kernel events\n");
goto out;
}
/* set signal handlers */
memset(&act, 0x00, sizeof(struct sigaction));
act.sa_handler = (void (*)(int)) sig_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
printf("monitor will print the received events for:\n");
if (print_udev) {
udev_monitor = udev_monitor_new_from_socket(udev, "@/org/kernel/udev/monitor");
if (udev_monitor == NULL) {
rc = 1;
goto out;
}
if (udev_monitor_enable_receiving(udev_monitor) < 0) {
rc = 2;
goto out;
}
printf("UDEV the event which udev sends out after rule processing\n");
}
if (print_kernel) {
kernel_monitor = udev_monitor_new_from_netlink(udev);
if (kernel_monitor == NULL) {
rc = 3;
goto out;
}
if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
rc = 4;
goto out;
}
printf("UEVENT the kernel uevent\n");
}
printf("\n");
while (!udev_exit) {
int fdcount;
struct timeval tv;
struct timezone tz;
char timestr[64];
FD_ZERO(&readfds);
if (kernel_monitor != NULL)
FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
if (udev_monitor != NULL)
FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
&readfds, NULL, NULL, NULL);
if (fdcount < 0) {
if (errno != EINTR)
fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
continue;
}
if (gettimeofday(&tv, &tz) == 0) {
snprintf(timestr, sizeof(timestr), "%llu.%06u",
(unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec);
} else
timestr[0] = '\0';
if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
struct udev_device *device = udev_monitor_receive_device(kernel_monitor);
if (device == NULL)
continue;
printf("UEVENT[%s] %-8s %s (%s)\n", timestr,
udev_device_get_action(device),
udev_device_get_devpath(device),
udev_device_get_subsystem(device));
if (env)
print_properties(device);
udev_device_unref(device);
}
if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
struct udev_device *device = udev_monitor_receive_device(udev_monitor);
if (device == NULL)
continue;
printf("UDEV [%s] %-8s %s (%s)\n", timestr,
udev_device_get_action(device),
udev_device_get_devpath(device),
udev_device_get_subsystem(device));
if (env)
print_properties(device);
udev_device_unref(device);
}
}
out:
udev_monitor_unref(udev_monitor);
udev_monitor_unref(kernel_monitor);
return rc;
}
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