| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "alloc-util.h" |
| #include "env-file.h" |
| #include "log.h" |
| #include "parse-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "udev-util.h" |
| #include "udev.h" |
| |
| static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = { |
| [RESOLVE_NAME_NEVER] = "never", |
| [RESOLVE_NAME_LATE] = "late", |
| [RESOLVE_NAME_EARLY] = "early", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming); |
| |
| int udev_parse_config_full( |
| unsigned *ret_children_max, |
| usec_t *ret_exec_delay_usec, |
| usec_t *ret_event_timeout_usec, |
| ResolveNameTiming *ret_resolve_name_timing) { |
| |
| _cleanup_free_ char *log_val = NULL, *children_max = NULL, *exec_delay = NULL, *event_timeout = NULL, *resolve_names = NULL; |
| int r; |
| |
| r = parse_env_file(NULL, "/etc/udev/udev.conf", |
| "udev_log", &log_val, |
| "children_max", &children_max, |
| "exec_delay", &exec_delay, |
| "event_timeout", &event_timeout, |
| "resolve_names", &resolve_names); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return r; |
| |
| if (log_val) { |
| const char *log; |
| size_t n; |
| |
| /* unquote */ |
| n = strlen(log_val); |
| if (n >= 2 && |
| ((log_val[0] == '"' && log_val[n-1] == '"') || |
| (log_val[0] == '\'' && log_val[n-1] == '\''))) { |
| log_val[n - 1] = '\0'; |
| log = log_val + 1; |
| } else |
| log = log_val; |
| |
| /* we set the udev log level here explicitly, this is supposed |
| * to regulate the code in libudev/ and udev/. */ |
| r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log); |
| if (r < 0) |
| log_debug_errno(r, "/etc/udev/udev.conf: failed to set udev log level '%s', ignoring: %m", log); |
| } |
| |
| if (ret_children_max && children_max) { |
| r = safe_atou(children_max, ret_children_max); |
| if (r < 0) |
| log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse children_max=%s, ignoring: %m", children_max); |
| } |
| |
| if (ret_exec_delay_usec && exec_delay) { |
| r = parse_sec(exec_delay, ret_exec_delay_usec); |
| if (r < 0) |
| log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse exec_delay=%s, ignoring: %m", exec_delay); |
| } |
| |
| if (ret_event_timeout_usec && event_timeout) { |
| r = parse_sec(event_timeout, ret_event_timeout_usec); |
| if (r < 0) |
| log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse event_timeout=%s, ignoring: %m", event_timeout); |
| } |
| |
| if (ret_resolve_name_timing && resolve_names) { |
| ResolveNameTiming t; |
| |
| t = resolve_name_timing_from_string(resolve_names); |
| if (t < 0) |
| log_notice("/etc/udev/udev.conf: failed to set parse resolve_names=%s, ignoring.", resolve_names); |
| else |
| *ret_resolve_name_timing = t; |
| } |
| |
| return 0; |
| } |
| |
| struct DeviceMonitorData { |
| const char *sysname; |
| sd_device *device; |
| }; |
| |
| static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) { |
| struct DeviceMonitorData *data = userdata; |
| const char *sysname; |
| |
| assert(device); |
| assert(data); |
| assert(data->sysname); |
| assert(!data->device); |
| |
| if (sd_device_get_sysname(device, &sysname) >= 0 && streq(sysname, data->sysname)) { |
| data->device = sd_device_ref(device); |
| return sd_event_exit(sd_device_monitor_get_event(monitor), 0); |
| } |
| |
| return 0; |
| } |
| |
| int device_wait_for_initialization(sd_device *device, const char *subsystem, sd_device **ret) { |
| _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL; |
| _cleanup_(sd_event_unrefp) sd_event *event = NULL; |
| struct DeviceMonitorData data = {}; |
| int r; |
| |
| assert(device); |
| assert(subsystem); |
| |
| if (sd_device_get_is_initialized(device) > 0) { |
| if (ret) |
| *ret = sd_device_ref(device); |
| return 0; |
| } |
| |
| assert_se(sd_device_get_sysname(device, &data.sysname) >= 0); |
| |
| /* Wait until the device is initialized, so that we can get access to the ID_PATH property */ |
| |
| r = sd_event_new(&event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to get default event: %m"); |
| |
| r = sd_device_monitor_new(&monitor); |
| if (r < 0) |
| return log_error_errno(r, "Failed to acquire monitor: %m"); |
| |
| r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to add %s subsystem match to monitor: %m", subsystem); |
| |
| r = sd_device_monitor_attach_event(monitor, event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event to device monitor: %m"); |
| |
| r = sd_device_monitor_start(monitor, device_monitor_handler, &data); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| /* Check again, maybe things changed. Udev will re-read the db if the device wasn't initialized |
| * yet. */ |
| if (sd_device_get_is_initialized(device) > 0) { |
| if (ret) |
| *ret = sd_device_ref(device); |
| return 0; |
| } |
| |
| r = sd_event_loop(event); |
| if (r < 0) |
| return log_error_errno(r, "Event loop failed: %m"); |
| |
| if (ret) |
| *ret = TAKE_PTR(data.device); |
| return 0; |
| } |
| |
| int device_is_renaming(sd_device *dev) { |
| int r; |
| |
| assert(dev); |
| |
| r = sd_device_get_property_value(dev, "ID_RENAMING", NULL); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| return r >= 0; |
| } |
| |
| bool device_for_action(sd_device *dev, DeviceAction action) { |
| DeviceAction a; |
| |
| assert(dev); |
| |
| if (device_get_action(dev, &a) < 0) |
| return false; |
| |
| return a == action; |
| } |