diff options
Diffstat (limited to 'src/grp-udev/udevadm/udevadm-monitor.c')
| -rw-r--r-- | src/grp-udev/udevadm/udevadm-monitor.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/src/grp-udev/udevadm/udevadm-monitor.c b/src/grp-udev/udevadm/udevadm-monitor.c new file mode 100644 index 0000000000..3503b19a21 --- /dev/null +++ b/src/grp-udev/udevadm/udevadm-monitor.c @@ -0,0 +1,281 @@ +/* + * Copyright (C) 2004-2010 Kay Sievers <kay@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 <errno.h> +#include <getopt.h> +#include <signal.h> +#include <stddef.h> +#include <stdio.h> +#include <string.h> +#include <sys/epoll.h> +#include <sys/time.h> +#include <time.h> + +#include "systemd-basic/fd-util.h" +#include "systemd-basic/formats-util.h" +#include "systemd-shared/udev-util.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; + + assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0); + printf("%-6s[%"PRI_TIME".%06ld] %-8s %s (%s)\n", + source, + ts.tv_sec, 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 void help(void) { + printf("%s monitor [--property] [--kernel] [--udev] [--help]\n\n" + "Listen to kernel and udev events.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " -p --property Print the event properties\n" + " -k --kernel Print kernel uevents\n" + " -u --udev Print udev events\n" + " -s --subsystem-match=SUBSYSTEM[/DEVTYPE] Filter events by subsystem\n" + " -t --tag-match=TAG Filter events by tag\n" + , program_invocation_short_name); +} + +static int adm_monitor(struct udev *udev, int argc, char *argv[]) { + struct sigaction act = {}; + sigset_t mask; + bool prop = false; + bool print_kernel = false; + bool print_udev = false; + _cleanup_udev_list_cleanup_ struct udev_list subsystem_match_list; + _cleanup_udev_list_cleanup_ struct udev_list tag_match_list; + _cleanup_udev_monitor_unref_ struct udev_monitor *udev_monitor = NULL; + _cleanup_udev_monitor_unref_ struct udev_monitor *kernel_monitor = NULL; + _cleanup_close_ int fd_ep = -1; + int fd_kernel = -1, fd_udev = -1; + struct epoll_event ep_kernel, ep_udev; + int c; + + static const struct option options[] = { + { "property", no_argument, NULL, 'p' }, + { "environment", no_argument, NULL, 'e' }, /* alias for -p */ + { "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); + + while ((c = getopt_long(argc, argv, "pekus:t:h", options, NULL)) >= 0) + switch (c) { + 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; + + 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': + help(); + return 0; + default: + return 1; + } + + if (!print_kernel && !print_udev) { + print_kernel = true; + print_udev = true; + } + + /* set signal handlers */ + act.sa_handler = sig_handler; + 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); + + /* Callers are expecting to see events as they happen: Line buffering */ + setlinebuf(stdout); + + fd_ep = epoll_create1(EPOLL_CLOEXEC); + if (fd_ep < 0) { + log_error_errno(errno, "error creating epoll fd: %m"); + return 1; + } + + 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"); + return 1; + } + 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"); + return 2; + } + + memzero(&ep_udev, 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_errno(errno, "fail to add fd to epoll: %m"); + return 2; + } + + 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"); + return 3; + } + 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"); + return 4; + } + + memzero(&ep_kernel, 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_errno(errno, "fail to add fd to epoll: %m"); + return 5; + } + + 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); + } + } + } + + return 0; +} + +const struct udevadm_cmd udevadm_monitor = { + .name = "monitor", + .cmd = adm_monitor, + .help = "Listen to kernel and udev events", +}; |