diff options
Diffstat (limited to 'src/udev/udevadm-monitor.c')
| -rw-r--r-- | src/udev/udevadm-monitor.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/src/udev/udevadm-monitor.c b/src/udev/udevadm-monitor.c new file mode 100644 index 0000000..3dde3f3 --- /dev/null +++ b/src/udev/udevadm-monitor.c @@ -0,0 +1,263 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ + +#include <errno.h> +#include <getopt.h> +#include <signal.h> + +#include "sd-device.h" +#include "sd-event.h" + +#include "alloc-util.h" +#include "device-monitor-private.h" +#include "device-util.h" +#include "fd-util.h" +#include "format-util.h" +#include "hashmap.h" +#include "set.h" +#include "signal-util.h" +#include "string-util.h" +#include "udevadm.h" +#include "virt.h" + +static bool arg_show_property = false; +static bool arg_print_kernel = false; +static bool arg_print_udev = false; +static Set *arg_tag_filter = NULL; +static Hashmap *arg_subsystem_filter = NULL; + +static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) { + const char *action = NULL, *devpath = NULL, *subsystem = NULL; + MonitorNetlinkGroup group = PTR_TO_INT(userdata); + struct timespec ts; + + assert(device); + assert(IN_SET(group, MONITOR_GROUP_UDEV, MONITOR_GROUP_KERNEL)); + + (void) sd_device_get_property_value(device, "ACTION", &action); + (void) sd_device_get_devpath(device, &devpath); + (void) sd_device_get_subsystem(device, &subsystem); + + assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0); + + printf("%-6s[%"PRI_TIME".%06"PRI_NSEC"] %-8s %s (%s)\n", + group == MONITOR_GROUP_UDEV ? "UDEV" : "KERNEL", + ts.tv_sec, (nsec_t)ts.tv_nsec/1000, + action, devpath, subsystem); + + if (arg_show_property) { + const char *key, *value; + + FOREACH_DEVICE_PROPERTY(device, key, value) + printf("%s=%s\n", key, value); + + printf("\n"); + } + + return 0; +} + +static int setup_monitor(MonitorNetlinkGroup sender, sd_event *event, sd_device_monitor **ret) { + _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL; + const char *subsystem, *devtype, *tag; + Iterator i; + int r; + + r = device_monitor_new_full(&monitor, sender, -1); + if (r < 0) + return log_error_errno(r, "Failed to create netlink socket: %m"); + + (void) sd_device_monitor_set_receive_buffer_size(monitor, 128*1024*1024); + + r = sd_device_monitor_attach_event(monitor, event); + if (r < 0) + return log_error_errno(r, "Failed to attach event: %m"); + + HASHMAP_FOREACH_KEY(devtype, subsystem, arg_subsystem_filter, i) { + r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, devtype); + if (r < 0) + return log_error_errno(r, "Failed to apply subsystem filter '%s%s%s': %m", + subsystem, devtype ? "/" : "", strempty(devtype)); + } + + SET_FOREACH(tag, arg_tag_filter, i) { + r = sd_device_monitor_filter_add_match_tag(monitor, tag); + if (r < 0) + return log_error_errno(r, "Failed to apply tag filter '%s': %m", tag); + } + + r = sd_device_monitor_start(monitor, device_monitor_handler, INT_TO_PTR(sender)); + if (r < 0) + return log_error_errno(r, "Failed to start device monitor: %m"); + + (void) sd_event_source_set_description(sd_device_monitor_get_event_source(monitor), + sender == MONITOR_GROUP_UDEV ? "device-monitor-udev" : "device-monitor-kernel"); + + *ret = TAKE_PTR(monitor); + return 0; +} + +static int help(void) { + printf("%s monitor [OPTIONS]\n\n" + "Listen to kernel and udev events.\n\n" + " -h --help Show this help\n" + " -V --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); + + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + 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' }, + { "version", no_argument, NULL, 'V' }, + { "help", no_argument, NULL, 'h' }, + {} + }; + + int r, c; + + while ((c = getopt_long(argc, argv, "pekus:t:Vh", options, NULL)) >= 0) + switch (c) { + case 'p': + case 'e': + arg_show_property = true; + break; + case 'k': + arg_print_kernel = true; + break; + case 'u': + arg_print_udev = true; + break; + case 's': { + _cleanup_free_ char *subsystem = NULL, *devtype = NULL; + const char *slash; + + slash = strchr(optarg, '/'); + if (slash) { + devtype = strdup(slash + 1); + if (!devtype) + return -ENOMEM; + + subsystem = strndup(optarg, slash - optarg); + } else + subsystem = strdup(optarg); + + if (!subsystem) + return -ENOMEM; + + r = hashmap_ensure_allocated(&arg_subsystem_filter, NULL); + if (r < 0) + return r; + + r = hashmap_put(arg_subsystem_filter, subsystem, devtype); + if (r < 0) + return r; + + subsystem = devtype = NULL; + break; + } + case 't': { + _cleanup_free_ char *tag = NULL; + + r = set_ensure_allocated(&arg_tag_filter, &string_hash_ops); + if (r < 0) + return r; + + tag = strdup(optarg); + if (!tag) + return -ENOMEM; + + r = set_put(arg_tag_filter, tag); + if (r < 0) + return r; + + tag = NULL; + break; + } + case 'V': + return print_version(); + case 'h': + return help(); + case '?': + return -EINVAL; + default: + assert_not_reached("Unknown option."); + } + + if (!arg_print_kernel && !arg_print_udev) { + arg_print_kernel = true; + arg_print_udev = true; + } + + return 1; +} + +int monitor_main(int argc, char *argv[], void *userdata) { + _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *kernel_monitor = NULL, *udev_monitor = NULL; + _cleanup_(sd_event_unrefp) sd_event *event = NULL; + int r; + + r = parse_argv(argc, argv); + if (r <= 0) + goto finalize; + + if (running_in_chroot() > 0) { + log_info("Running in chroot, ignoring request."); + return 0; + } + + /* Callers are expecting to see events as they happen: Line buffering */ + setlinebuf(stdout); + + r = sd_event_default(&event); + if (r < 0) { + log_error_errno(r, "Failed to initialize event: %m"); + goto finalize; + } + + assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); + (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL); + (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL); + + printf("monitor will print the received events for:\n"); + if (arg_print_udev) { + r = setup_monitor(MONITOR_GROUP_UDEV, event, &udev_monitor); + if (r < 0) + goto finalize; + + printf("UDEV - the event which udev sends out after rule processing\n"); + } + + if (arg_print_kernel) { + r = setup_monitor(MONITOR_GROUP_KERNEL, event, &kernel_monitor); + if (r < 0) + goto finalize; + + printf("KERNEL - the kernel uevent\n"); + } + printf("\n"); + + r = sd_event_loop(event); + if (r < 0) { + log_error_errno(r, "Failed to run event loop: %m"); + goto finalize; + } + + r = 0; + +finalize: + hashmap_free_free_free(arg_subsystem_filter); + set_free_free(arg_tag_filter); + + return r; +} |