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sd-device: add API to query from when a udev database entry is

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We already store a CLOCK_MONOTONIC timestamp for each device appearance,
let' make this queriable.

This is useful to determine whether a udev device database entry is from
a current appearance of the device or a previous one, by comparing it
with appropriately taken timestamps.
This commit is contained in:
Lennart Poettering 2021-04-20 16:01:53 +02:00
parent 75dc190d39
commit 8626b43be4
3 changed files with 23 additions and 0 deletions
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1
src/libsystemd/libsystemd.sym
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@ -756,4 +756,5 @@ LIBSYSTEMD_249 {
global:
sd_device_monitor_filter_add_match_sysattr;
sd_device_monitor_filter_add_match_parent;
sd_device_get_usec_initialized;
} LIBSYSTEMD_248;

21
src/libsystemd/sd-device/sd-device.c
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@ -1428,6 +1428,27 @@ _public_ int sd_device_get_is_initialized(sd_device *device) {
return device->is_initialized;
}
_public_ int sd_device_get_usec_initialized(sd_device *device, uint64_t *ret) {
int r;
assert_return(device, -EINVAL);
r = device_read_db(device);
if (r < 0)
return r;
if (!device->is_initialized)
return -EBUSY;
if (device->usec_initialized == 0)
return -ENODATA;
if (ret)
*ret = device->usec_initialized;
return 0;
}
_public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec) {
usec_t now_ts;
int r;

1
src/systemd/sd-device.h
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@ -79,6 +79,7 @@ int sd_device_get_action(sd_device *device, sd_device_action_t *ret);
int sd_device_get_seqnum(sd_device *device, uint64_t *ret);
int sd_device_get_is_initialized(sd_device *device);
int sd_device_get_usec_initialized(sd_device *device, uint64_t *usec);
int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *usec);
const char *sd_device_get_tag_first(sd_device *device);