/* * Copyright (C) 2004-2010 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 <time.h> #include <sys/time.h> #include <sys/socket.h> #include <sys/un.h> #include <sys/epoll.h> #include <linux/types.h> #include <linux/netlink.h> #include "udev.h" static bool udev_exit; static void sig_handler(int signum) { if (signum == SIGINT || signum == SIGTERM) udev_exit = true; } static void print_device(struct udev_device *device, const char *source, int prop) { struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); printf("%-6s[%llu.%06u] %-8s %s (%s)\n", source, (unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000, udev_device_get_action(device), udev_device_get_devpath(device), udev_device_get_subsystem(device)); if (prop) { 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"); } } static int adm_monitor(struct udev *udev, int argc, char *argv[]) { struct sigaction act; sigset_t mask; int option; bool prop = false; bool print_kernel = false; bool print_udev = false; struct udev_list subsystem_match_list; struct udev_list tag_match_list; struct udev_monitor *udev_monitor = NULL; struct udev_monitor *kernel_monitor = NULL; int fd_ep = -1; int fd_kernel = -1, fd_udev = -1; struct epoll_event ep_kernel, ep_udev; int rc = 0; static const struct option options[] = { { "property", no_argument, NULL, 'p' }, { "environment", no_argument, NULL, 'e' }, { "kernel", no_argument, NULL, 'k' }, { "udev", no_argument, NULL, 'u' }, { "subsystem-match", required_argument, NULL, 's' }, { "tag-match", required_argument, NULL, 't' }, { "help", no_argument, NULL, 'h' }, {} }; udev_list_init(udev, &subsystem_match_list, true); udev_list_init(udev, &tag_match_list, true); for (;;) { option = getopt_long(argc, argv, "pekus:t:h", options, NULL); if (option == -1) break; switch (option) { case 'p': case 'e': prop = true; break; case 'k': print_kernel = true; break; case 'u': print_udev = true; 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(&subsystem_match_list, subsys, devtype); break; } case 't': udev_list_entry_add(&tag_match_list, optarg, NULL); break; case 'h': printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n" " --property print the event properties\n" " --kernel print kernel uevents\n" " --udev print udev events\n" " --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n" " --tag-match=<tag> filter events by tag\n" " --help\n\n"); goto out; default: rc = 1; goto out; } } if (!print_kernel && !print_udev) { print_kernel = true; print_udev = true; } /* 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); sigemptyset(&mask); sigaddset(&mask, SIGINT); sigaddset(&mask, SIGTERM); sigprocmask(SIG_UNBLOCK, &mask, NULL); fd_ep = epoll_create1(EPOLL_CLOEXEC); if (fd_ep < 0) { log_error("error creating epoll fd: %m\n"); goto out; } 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_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024); fd_udev = udev_monitor_get_fd(udev_monitor); 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); } udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) { const char *tag = udev_list_entry_get_name(entry); if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0) fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag); } if (udev_monitor_enable_receiving(udev_monitor) < 0) { fprintf(stderr, "error: unable to subscribe to udev events\n"); rc = 2; goto out; } memset(&ep_udev, 0, sizeof(struct epoll_event)); ep_udev.events = EPOLLIN; ep_udev.data.fd = fd_udev; if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) { log_error("fail to add fd to epoll: %m\n"); 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_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024); fd_kernel = udev_monitor_get_fd(kernel_monitor); 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; } memset(&ep_kernel, 0, sizeof(struct epoll_event)); ep_kernel.events = EPOLLIN; ep_kernel.data.fd = fd_kernel; if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) { log_error("fail to add fd to epoll: %m\n"); goto out; } printf("KERNEL - the kernel uevent\n"); } printf("\n"); while (!udev_exit) { int fdcount; struct epoll_event ev[4]; int i; fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); if (fdcount < 0) { if (errno != EINTR) fprintf(stderr, "error receiving uevent message: %m\n"); continue; } for (i = 0; i < fdcount; i++) { if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) { struct udev_device *device; device = udev_monitor_receive_device(kernel_monitor); if (device == NULL) continue; print_device(device, "KERNEL", prop); udev_device_unref(device); } else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) { struct udev_device *device; device = udev_monitor_receive_device(udev_monitor); if (device == NULL) continue; print_device(device, "UDEV", prop); udev_device_unref(device); } } } out: if (fd_ep >= 0) close(fd_ep); udev_monitor_unref(udev_monitor); udev_monitor_unref(kernel_monitor); udev_list_cleanup(&subsystem_match_list); udev_list_cleanup(&tag_match_list); return rc; } const struct udevadm_cmd udevadm_monitor = { .name = "monitor", .cmd = adm_monitor, .help = "listen to kernel and udev events", };