271 lines
11 KiB
C
271 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#include <errno.h>
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#include <getopt.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/time.h>
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#include <time.h>
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#include "fd-util.h"
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#include "format-util.h"
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#include "udev.h"
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#include "udevadm-util.h"
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static bool udev_exit;
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static void sig_handler(int signum) {
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if (IN_SET(signum, SIGINT, SIGTERM))
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udev_exit = true;
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}
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static void print_device(struct udev_device *device, const char *source, int prop) {
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struct timespec ts;
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assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
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printf("%-6s[%"PRI_TIME".%06"PRI_NSEC"] %-8s %s (%s)\n",
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source,
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ts.tv_sec, (nsec_t)ts.tv_nsec/1000,
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udev_device_get_action(device),
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udev_device_get_devpath(device),
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udev_device_get_subsystem(device));
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if (prop) {
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struct udev_list_entry *list_entry;
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udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
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printf("%s=%s\n",
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udev_list_entry_get_name(list_entry),
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udev_list_entry_get_value(list_entry));
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printf("\n");
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}
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}
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static void help(void) {
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printf("%s monitor [OPTIONS]\n\n"
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"Listen to kernel and udev events.\n\n"
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" -h --help Show this help\n"
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" -V --version Show package version\n"
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" -p --property Print the event properties\n"
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" -k --kernel Print kernel uevents\n"
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" -u --udev Print udev events\n"
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" -s --subsystem-match=SUBSYSTEM[/DEVTYPE] Filter events by subsystem\n"
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" -t --tag-match=TAG Filter events by tag\n"
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, program_invocation_short_name);
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}
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static int adm_monitor(struct udev *udev, int argc, char *argv[]) {
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struct sigaction act = {};
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sigset_t mask;
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bool prop = false;
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bool print_kernel = false;
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bool print_udev = false;
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_cleanup_(udev_list_cleanup) struct udev_list subsystem_match_list;
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_cleanup_(udev_list_cleanup) struct udev_list tag_match_list;
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_cleanup_(udev_monitor_unrefp) struct udev_monitor *udev_monitor = NULL;
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_cleanup_(udev_monitor_unrefp) struct udev_monitor *kernel_monitor = NULL;
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_cleanup_close_ int fd_ep = -1;
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int fd_kernel = -1, fd_udev = -1;
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struct epoll_event ep_kernel, ep_udev;
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int c;
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static const struct option options[] = {
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{ "property", no_argument, NULL, 'p' },
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{ "environment", no_argument, NULL, 'e' }, /* alias for -p */
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{ "kernel", no_argument, NULL, 'k' },
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{ "udev", no_argument, NULL, 'u' },
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{ "subsystem-match", required_argument, NULL, 's' },
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{ "tag-match", required_argument, NULL, 't' },
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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udev_list_init(udev, &subsystem_match_list, true);
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udev_list_init(udev, &tag_match_list, true);
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while ((c = getopt_long(argc, argv, "pekus:t:Vh", options, NULL)) >= 0)
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switch (c) {
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case 'p':
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case 'e':
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prop = true;
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break;
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case 'k':
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print_kernel = true;
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break;
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case 'u':
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print_udev = true;
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break;
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case 's':
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{
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char subsys[UTIL_NAME_SIZE];
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char *devtype;
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strscpy(subsys, sizeof(subsys), optarg);
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devtype = strchr(subsys, '/');
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if (devtype != NULL) {
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devtype[0] = '\0';
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devtype++;
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}
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udev_list_entry_add(&subsystem_match_list, subsys, devtype);
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break;
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}
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case 't':
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udev_list_entry_add(&tag_match_list, optarg, NULL);
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break;
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case 'V':
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print_version();
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return 0;
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case 'h':
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help();
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return 0;
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default:
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return 1;
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}
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if (!print_kernel && !print_udev) {
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print_kernel = true;
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print_udev = true;
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}
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/* set signal handlers */
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act.sa_handler = sig_handler;
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act.sa_flags = SA_RESTART;
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assert_se(sigaction(SIGINT, &act, NULL) == 0);
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assert_se(sigaction(SIGTERM, &act, NULL) == 0);
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assert_se(sigemptyset(&mask) == 0);
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assert_se(sigaddset(&mask, SIGINT) == 0);
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assert_se(sigaddset(&mask, SIGTERM) == 0);
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assert_se(sigprocmask(SIG_UNBLOCK, &mask, NULL) == 0);
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/* Callers are expecting to see events as they happen: Line buffering */
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setlinebuf(stdout);
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fd_ep = epoll_create1(EPOLL_CLOEXEC);
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if (fd_ep < 0) {
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log_error_errno(errno, "error creating epoll fd: %m");
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return 1;
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}
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printf("monitor will print the received events for:\n");
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if (print_udev) {
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struct udev_list_entry *entry;
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udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
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if (udev_monitor == NULL) {
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fprintf(stderr, "error: unable to create netlink socket\n");
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return 1;
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}
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udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
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fd_udev = udev_monitor_get_fd(udev_monitor);
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udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
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const char *subsys = udev_list_entry_get_name(entry);
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const char *devtype = udev_list_entry_get_value(entry);
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if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
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fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
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}
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udev_list_entry_foreach(entry, udev_list_get_entry(&tag_match_list)) {
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const char *tag = udev_list_entry_get_name(entry);
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if (udev_monitor_filter_add_match_tag(udev_monitor, tag) < 0)
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fprintf(stderr, "error: unable to apply tag filter '%s'\n", tag);
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}
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if (udev_monitor_enable_receiving(udev_monitor) < 0) {
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fprintf(stderr, "error: unable to subscribe to udev events\n");
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return 2;
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}
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memzero(&ep_udev, sizeof(struct epoll_event));
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ep_udev.events = EPOLLIN;
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ep_udev.data.fd = fd_udev;
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if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
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log_error_errno(errno, "fail to add fd to epoll: %m");
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return 2;
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}
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printf("UDEV - the event which udev sends out after rule processing\n");
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}
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if (print_kernel) {
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struct udev_list_entry *entry;
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kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
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if (kernel_monitor == NULL) {
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fprintf(stderr, "error: unable to create netlink socket\n");
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return 3;
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}
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udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
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fd_kernel = udev_monitor_get_fd(kernel_monitor);
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udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
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const char *subsys = udev_list_entry_get_name(entry);
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if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
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fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
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}
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if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
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fprintf(stderr, "error: unable to subscribe to kernel events\n");
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return 4;
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}
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memzero(&ep_kernel, sizeof(struct epoll_event));
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ep_kernel.events = EPOLLIN;
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ep_kernel.data.fd = fd_kernel;
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if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_kernel, &ep_kernel) < 0) {
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log_error_errno(errno, "fail to add fd to epoll: %m");
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return 5;
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}
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printf("KERNEL - the kernel uevent\n");
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}
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printf("\n");
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while (!udev_exit) {
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int fdcount;
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struct epoll_event ev[4];
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int i;
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fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
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if (fdcount < 0) {
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if (errno != EINTR)
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fprintf(stderr, "error receiving uevent message: %m\n");
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continue;
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}
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for (i = 0; i < fdcount; i++) {
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if (ev[i].data.fd == fd_kernel && ev[i].events & EPOLLIN) {
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struct udev_device *device;
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device = udev_monitor_receive_device(kernel_monitor);
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if (device == NULL)
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continue;
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print_device(device, "KERNEL", prop);
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udev_device_unref(device);
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} else if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
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struct udev_device *device;
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device = udev_monitor_receive_device(udev_monitor);
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if (device == NULL)
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continue;
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print_device(device, "UDEV", prop);
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udev_device_unref(device);
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}
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}
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}
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return 0;
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}
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const struct udevadm_cmd udevadm_monitor = {
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.name = "monitor",
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.cmd = adm_monitor,
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.help = "Listen to kernel and udev events",
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};
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