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/* 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_default(&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;
}
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