/* * 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 sig_handler(int signum) { if (signum == SIGINT || signum == SIGTERM) udev_exit = 1; } static void print_device(struct udev_device *device, const char *source, int env) { struct timeval tv; struct timezone tz; gettimeofday(&tv, &tz); printf("%-6s[%llu.%06u] %-8s %s (%s)\n", source, (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec, udev_device_get_action(device), udev_device_get_devpath(device), udev_device_get_subsystem(device)); if (env) { struct udev_list_entry *list_entry; udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device)) printf("%s=%s\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry)); 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_list_node subsystem_match_list; struct udev_monitor *udev_monitor = NULL; struct udev_monitor *kernel_monitor = NULL; fd_set readfds; int rc = 0; static const struct option options[] = { { "environment", no_argument, NULL, 'e' }, { "kernel", no_argument, NULL, 'k' }, { "udev", no_argument, NULL, 'u' }, { "subsystem-match", required_argument, NULL, 's' }, { "help", no_argument, NULL, 'h' }, {} }; udev_list_init(&subsystem_match_list); while (1) { option = getopt_long(argc, argv, "ekus:h", 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 's': { char subsys[UTIL_NAME_SIZE]; char *devtype; util_strscpy(subsys, sizeof(subsys), optarg); devtype = strchr(subsys, ':'); if (devtype != NULL) { devtype[0] = '\0'; devtype++; } udev_list_entry_add(udev, &subsystem_match_list, subsys, devtype, 0, 0); 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" " --subsystem-match=<subsystem> filter events\n" " --help\n\n"); default: goto out; } } if (!print_kernel && !print_udev) { print_kernel = 1; print_udev =1; } /* set signal handlers */ memset(&act, 0x00, sizeof(struct sigaction)); act.sa_handler = 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) { struct udev_list_entry *entry; udev_monitor = udev_monitor_new_from_netlink(udev, "udev"); if (udev_monitor == NULL) { fprintf(stderr, "error: unable to create netlink socket\n"); rc = 1; goto out; } udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) { const char *subsys = udev_list_entry_get_name(entry); const char *devtype = udev_list_entry_get_value(entry); if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0) fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys); } if (udev_monitor_enable_receiving(udev_monitor) < 0) { fprintf(stderr, "error: unable to subscribe to udev events\n"); rc = 2; goto out; } printf("UDEV - the event which udev sends out after rule processing\n"); } if (print_kernel) { struct udev_list_entry *entry; kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel"); if (kernel_monitor == NULL) { fprintf(stderr, "error: unable to create netlink socket\n"); rc = 3; goto out; } udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) { const char *subsys = udev_list_entry_get_name(entry); if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0) fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys); } if (udev_monitor_enable_receiving(kernel_monitor) < 0) { fprintf(stderr, "error: unable to subscribe to kernel events\n"); rc = 4; goto out; } printf("KERNEL - the kernel uevent\n"); } printf("\n"); while (!udev_exit) { int fdcount; 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: %m\n"); continue; } if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) { struct udev_device *device; device = udev_monitor_receive_device(kernel_monitor); if (device == NULL) continue; print_device(device, "KERNEL", env); udev_device_unref(device); } if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) { struct udev_device *device; device = udev_monitor_receive_device(udev_monitor); if (device == NULL) continue; print_device(device, "UDEV", env); udev_device_unref(device); } } out: udev_monitor_unref(udev_monitor); udev_monitor_unref(kernel_monitor); udev_list_cleanup_entries(udev, &subsystem_match_list); return rc; }